0
bashin theory and in practice
19.06.2013
03.07.2013 @pvb265 #imolug
Agenda
General Info
Underwater
Overview
Syntax
Examples
19.06.2013
03.07.2013 @pvb265 #imolug
Agenda
General Info
Underwater
Overview
Syntax
Examples
19.06.2013
03.07.2013 @pvb265 #imolug
19.06
03.07
Agenda
General Info
Underwater
Overview
Syntax
Examples
19.06.2013
03.07.2013 @pvb265 #imolug
19.06
03.07
bash
bourne again shell
GNU project
textual shell
19.06.2013
03.07.2013 @pvb265 #imolug
interface of an O. S.
to access Kernel services
19.06.2013
03.07.2013 @pvb265 #imolug
shell
bash
. resources control
. process execution
19.06.2013
03.07.2013 @pvb265 #imolug
o.s.
shellbash
. process manager
. memory manager
. scheduler/event manager
. file manager
19.06.2013
03.07.2013 @pvb265 #imolug
o.s.
she...
. process wrapper
. scheduler controll
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.shellbash
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
Desktop PC, Parallel Systems, Distribuited Systems,
Clustered...
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
Desktop PC, Parallel Systems, Distribuited Systems,
Clustered...
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
Desktop PC, Parallel Systems, Distribuited Systems,
Clustered...
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
Desktop PC, Parallel Systems, Distribuited Systems,
Clustered...
19.06.2013
03.07.2013 @pvb265 #imolug
kernel
o.s.
shell
bash
Desktop PC, Parallel Systems, Distribuited Systems,
Clustered...
19.06.2013
03.07.2013 @pvb265 #imolug
shell 1970: runcom (Multics) JCL (s/390)
1975-1978: Steve Bourne, at Bell Labs wrote...
19.06.2013
03.07.2013 @pvb265 #imolug
bash
UnderWater
19.06.2013
03.07.2013 @pvb265 #imolug
bash Pick-Up a Mac OS X Box
UnderWater
Terminal Process
bash-3.2$ ps -ef|grep Termin...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Pick-Up a Mac OS X Box
UnderWater
Terminal Process
bash-3.2$ ps -ef|grep Termin...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Pick-Up a Mac OS X Box
UnderWater
Terminal Process
bash-3.2$ ps -ef|grep Termin...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Pick-Up a Linux Box
UnderWater
[root@www ~]# ps -ef|grep sshd
root 3065 1 0 Feb...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Who said system to invoke bash
UnderWater
[root@www ~]# cat /etc/passwd|head -5...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash the way to suit your bash
UnderWater
[root@www ~]# ls -l /etc/profile
-rw-r--r-...
19.06.2013
03.07.2013 @pvb265 #imolug
bash
Overview
19.06.2013
03.07.2013 @pvb265 #imolug
bash POSIX 1003.1 standard (IEEE Std 1003.1)
pazh-ics not poh-six
Command Interprete...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
Function Implemented:
Command line editing
Command line completion
Unl...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
[root@www ~]#set -o vi
Esc-k Esc-j
Function Implemented:
Command line ...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
[root@www ~]#set -o vi
Esc-k Esc-j
beginning-of-line (C-a)
end-of-line...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
[root@www ~]# ls /root/.bash
Function Implemented:
Command line editin...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
[root@www ~]# ls /root/.bash +TAB+TAB
.bash_history .bash_profile .bas...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
[root@www ~]# ls /root/.bash +TAB+TAB
.bash_history .bash_profile .bas...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
export HISTFSIZE=10000
export HISTFILESIZE=10000
shopt -s histappend
F...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
$PS1 - primary prompt string, default s-v$ .
$PS2 - secondary, default...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Overview
$PS1 - primary prompt string, default s-v$ .
$PS2 - secondary, default...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
19.06.2013
03.07.2013 @pvb265 #imolug
bash Function Implemented:
Command line editing
Command line completion
Unlimited si...
AgendaGeneral Info
Underwater
Overview
Syntax
Scripting
Examples
19.06.2013
03.07.2013 @pvb265 #imolug
19.06
03.07
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Bash in theory and in practice - part one

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Transcript of "Bash in theory and in practice - part one"

  1. 1. bashin theory and in practice 19.06.2013 03.07.2013 @pvb265 #imolug
  2. 2. Agenda General Info Underwater Overview Syntax Examples 19.06.2013 03.07.2013 @pvb265 #imolug
  3. 3. Agenda General Info Underwater Overview Syntax Examples 19.06.2013 03.07.2013 @pvb265 #imolug 19.06 03.07
  4. 4. Agenda General Info Underwater Overview Syntax Examples 19.06.2013 03.07.2013 @pvb265 #imolug 19.06 03.07
  5. 5. bash bourne again shell GNU project textual shell 19.06.2013 03.07.2013 @pvb265 #imolug
  6. 6. interface of an O. S. to access Kernel services 19.06.2013 03.07.2013 @pvb265 #imolug shell bash
  7. 7. . resources control . process execution 19.06.2013 03.07.2013 @pvb265 #imolug o.s. shellbash
  8. 8. . process manager . memory manager . scheduler/event manager . file manager 19.06.2013 03.07.2013 @pvb265 #imolug o.s. shellbash
  9. 9. . process wrapper . scheduler controll 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s.shellbash
  10. 10. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash
  11. 11. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash Desktop PC, Parallel Systems, Distribuited Systems, Clustered Systems, Real-time Systems, Embedded Systems
  12. 12. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash Desktop PC, Parallel Systems, Distribuited Systems, Clustered Systems, Real-time Systems, Embedded Systems Monolithic, MicroKernel, Hybryd kernel, exoKernel
  13. 13. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash Desktop PC, Parallel Systems, Distribuited Systems, Clustered Systems, Real-time Systems, Embedded Systems Monolithic, MicroKernel, noKernel, Hybryd kernel, exoKernel
  14. 14. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash Desktop PC, Parallel Systems, Distribuited Systems, Clustered Systems, Real-time Systems, Embedded Systems Monolithic, MicroKernel, Hybrid kernel, exoKernel textual, GUI
  15. 15. 19.06.2013 03.07.2013 @pvb265 #imolug kernel o.s. shell bash Desktop PC, Parallel Systems, Distribuited Systems, Clustered Systems, Real-time Systems, Embedded Systems Monolithic, MicroKernel, Hybrid kernel, exoKernel textual, GUI sh, csh, ksh, bash, tcsh, zsh
  16. 16. 19.06.2013 03.07.2013 @pvb265 #imolug shell 1970: runcom (Multics) JCL (s/390) 1975-1978: Steve Bourne, at Bell Labs wrote sh 1978-1979: Bill Joy at BSD wrote csh 1981: tcsh is a fork of csh POSIX compliance 1983: David Korn wrote ksh 1989: Brian Fox wrote bash 1990: Paul Falstad wrote zsh 1997: bash 2.0 2004: bash 3.0 2011: bash 4.2 latest (now) stable
  17. 17. 19.06.2013 03.07.2013 @pvb265 #imolug bash UnderWater
  18. 18. 19.06.2013 03.07.2013 @pvb265 #imolug bash Pick-Up a Mac OS X Box UnderWater Terminal Process bash-3.2$ ps -ef|grep Terminal ps -ef|grep Terminal 501 1636 211 0 1:55pm ?? 0:04.57 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_667811
  19. 19. 19.06.2013 03.07.2013 @pvb265 #imolug bash Pick-Up a Mac OS X Box UnderWater Terminal Process bash-3.2$ ps -ef|grep Terminal ps -ef|grep Terminal 501 1636 211 0 1:55pm ?? 0:04.57 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_667811 bash-3.2$ ps -ef| grep 1636 ps -ef| grep 1636 501 1636 211 0 1:55pm ?? 0:05.87 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_667811 0 1638 1636 0 1:55pm ttys000 0:00.03 login -pfql valeriobalbi /bin/bash -c exec -la bash /bin/bash Login Process
  20. 20. 19.06.2013 03.07.2013 @pvb265 #imolug bash Pick-Up a Mac OS X Box UnderWater Terminal Process bash-3.2$ ps -ef|grep Terminal ps -ef|grep Terminal 501 1636 211 0 1:55pm ?? 0:04.57 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_667811 bash-3.2$ ps -ef| grep 1636 ps -ef| grep 1636 501 1636 211 0 1:55pm ?? 0:05.87 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_667811 0 1638 1636 0 1:55pm ttys000 0:00.03 login -pfql valeriobalbi /bin/bash -c exec -la bash /bin/bash bash-3.2$ ps -ef| grep 1638 ps -ef| grep 1638 0 1638 1636 0 1:55pm ttys000 0:00.03 login -pfql valeriobalbi /bin/bash -c exec -la bash /bin/bash 501 1639 1638 0 1:55pm ttys000 0:00.11 -bash Login Process Shell Invocation
  21. 21. 19.06.2013 03.07.2013 @pvb265 #imolug bash Pick-Up a Linux Box UnderWater [root@www ~]# ps -ef|grep sshd root 3065 1 0 Feb05 ? 00:01:54 /usr/sbin/sshd root 10442 3065 0 17:15 ? 00:00:00 sshd: root@pts/0 [root@www ~]# ps -ef| grep 10442 root 10442 3065 0 17:15 ? 00:00:00 sshd: root@pts/0 root 10464 10442 0 17:15 pts/0 00:00:00 -bash SSH Process and Login Shell Invocation
  22. 22. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin Linux Users Definitions
  23. 23. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram Linux Users Definitions
  24. 24. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram [root@www ~]# grep root /etc/shadow Root: $1$LDqgrtQA$IXip/e.HuPhjSjLWXmrdj0 :15561 :0:99999:7::: Username Password Lastchanged PasswordAging Linux Users Definitions
  25. 25. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram [root@www ~]# grep root /etc/shadow Root: $1$LDqgrtQA$IXip/e.HuPhjSjLWXmrdj0 :15561 :0:99999:7::: Username Password Lastchanged PasswordAging [root@www ~]# cat /etc/passwd|head -1 root:$1$LDqgrtQA$IXip/e.HuPhjSjLWXmrdj0:0:0:root:/root:/bin/bash Linux Users Definitions
  26. 26. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram [root@www ~]# grep root /etc/shadow Root: $1$LDqgrtQA$IXip/e.HuPhjSjLWXmrdj0 :15561 :0:99999:7::: Username Password Lastchanged PasswordAging [root@www ~]# cat /etc/passwd|head -1 root::0:0:root:/root:/bin/bash Linux Users Definitions
  27. 27. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram Linux Users Definitions
  28. 28. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram [root@www ~]# ls -l /etc/shells -rw-r--r-- 1 root root 60 15 feb 2012 /etc/shells Linux Users Definitions
  29. 29. 19.06.2013 03.07.2013 @pvb265 #imolug bash Who said system to invoke bash UnderWater [root@www ~]# cat /etc/passwd|head -5 root :x :0 :0 :root :/root :/bin/bash bin :x :1 :1 :bin :/bin :/sbin/nologin daemon :x :2 :2 :daemon :/sbin :/sbin/nologin adm :x :3 :4 :adm :/var/adm :/sbin/nologin lp :x :4 :7 :lp :/var/spool/lpd :/sbin/nologin Username Password UID GID Description Home Initialprogram [root@www ~]# ls -l /etc/shells -rw-r--r-- 1 root root 60 15 feb 2012 /etc/shells [root@www ~]# cat /etc/shells /bin/sh /bin/bash /sbin/nologin /bin/tcsh /bin/csh /bin/ksh Linux Users Definitions
  30. 30. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile what after login?
  31. 31. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … what after login?
  32. 32. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login?
  33. 33. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5
  34. 34. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 for i in /etc/profile.d/*.sh ; do if [ -r "$i" ]; then if [ "$PS1" ]; then . $i else . $i >/dev/null 2>&1 fi fi done
  35. 35. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 for i in /etc/profile.d/*.sh ; do if [ -r "$i" ]; then if [ "$PS1" ]; then . $i else . $i >/dev/null 2>&1 fi fi done
  36. 36. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 if [ -f ~/.bashrc ]; then . ~/.bashrc fi
  37. 37. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 if [ -f ~/.bashrc ]; then . ~/.bashrc fi
  38. 38. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi
  39. 39. 19.06.2013 03.07.2013 @pvb265 #imolug bash the way to suit your bash UnderWater [root@www ~]# ls -l /etc/profile -rw-r--r-- 1 root root 1029 21 set 2009 /etc/profile [root@www ~]# ls -l /root/.bash_profile -rw-r--r-- 1 root root 191 6 gen 2007 /root/.bash_profile [root@www ~]# ls -l /etc/profile.d/ totale 104 -rwxr-xr-x 1 root root 766 21 lug 2011 colorls.csh -rwxr-xr-x 1 root root 727 21 lug 2011 colorls.sh -rwxr-xr-x 1 root root 3015 19 ago 2011 lang.csh -rwxr-xr-x 1 root root 3466 19 ago 2011 lang.sh … [root@www ~]# ls -l /root/.bashrc -rw-r--r-- 1 root root 176 6 gen 2007 /root/.bashrc [root@www ~]# ls -l /etc/bashrc -rw-r--r-- 1 root root 1708 21 set 2009 /etc/bashrc what after login? 1 2 4 3 5 # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi
  40. 40. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview
  41. 41. 19.06.2013 03.07.2013 @pvb265 #imolug bash POSIX 1003.1 standard (IEEE Std 1003.1) pazh-ics not poh-six Command Interpreter Default 4 Linux and Mac OS X Bourne Again Shell ( as rebird or another Bourne) A superset of Bourne shell Include history and directory stack from C shell Relative New concepts in the recents versions: . 3.0 regex like in perl . 4.0 hash to implement awk Overview
  42. 42. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  43. 43. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview [root@www ~]#set -o vi Esc-k Esc-j Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  44. 44. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview [root@www ~]#set -o vi Esc-k Esc-j beginning-of-line (C-a) end-of-line (C-e) forward-char (C-f) backward-char (C-b) forward-word (M-f) backward-word (M-b) clear-screen (C-l) Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  45. 45. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview [root@www ~]# ls /root/.bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  46. 46. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview [root@www ~]# ls /root/.bash +TAB+TAB .bash_history .bash_profile .bashrc Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  47. 47. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview [root@www ~]# ls /root/.bash +TAB+TAB .bash_history .bash_profile .bashrc [root@www ~]# mkfs +TAB+TAB mkfs mkfs.ext2 mkfs.ext3 mkfs.vfat Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  48. 48. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview export HISTFSIZE=10000 export HISTFILESIZE=10000 shopt -s histappend Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  49. 49. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview $PS1 - primary prompt string, default s-v$ . $PS2 - secondary, default is > $PS3 - prompt for the select command $PS4 - during an execution trace. default is + Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  50. 50. 19.06.2013 03.07.2013 @pvb265 #imolug bash Overview $PS1 - primary prompt string, default s-v$ . $PS2 - secondary, default is > $PS3 - prompt for the select command $PS4 - during an execution trace. default is + d : date "Tue May 26" h : hostname up to the first '.' t : current time HH:MM:SS u : username of the current user w : current working directory $ : if UID is 0, a #, otherwise a $ Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions
  51. 51. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview /etc/profile /etc/profile.d/* /root/.bash_profile /root/.bashrc /etc/bashrc
  52. 52. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview /etc/profile /etc/profile.d/* /root/.bash_profile /root/.bashrc /etc/bashrc
  53. 53. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview [root@www ~]# dirs ~ [root@www ~]# pushd /etc /etc ~ [root@www etc]# pushd /tmp /tmp /etc ~ [root@www tmp]# popd /etc ~ [root@www etc]# dirs /etc ~
  54. 54. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview bash -r rbash bash --restricted
  55. 55. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview bash -r rbash bash --restricted vi :set shell=/bin/sh :shell ~$ rbash ~$ cd / rbash: cd: restricted ~$ bash ~$ cd / /$
  56. 56. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview bash -r rbash bash --restricted vi :set shell=/bin/sh :shell ~$ rbash ~$ cd / rbash: cd: restricted ~$ bash ~$ cd / /$ rssh
  57. 57. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview - When a command in the hash table no longer exists, Bash will re-search $PATH to find the new location. This is also available with ‘shopt -s checkhash’. - The message printed by the job control code and builtins when a job exits with a non-zero status is ‘Done(status)’. - The message printed by the job control code and builtins when a job is stopped is ‘Stopped(signame)’, where signame is, for example, SIGTSTP. And other 42...
  58. 58. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview to test $file [ -e filepath ] true if file exists. [ -x filepath ] true if file exists and exec. [ -d filepath ] true if dir exists. [ expr1 -a expr2 ] and condition [ expr1 -o expr2 ] or condition
  59. 59. 19.06.2013 03.07.2013 @pvb265 #imolug bash Function Implemented: Command line editing Command line completion Unlimited size command history Prompt control Bash startup files The Directory Stack The Restricted Shell Bash POSIX Mode Bash conditional expressions Overview to test $file [ -e filepath ] true if file exists. [ -x filepath ] true if file exists and exec. [ -d filepath ] true if dir exists. [ expr1 -a expr2 ] and condition [ expr1 -o expr2 ] or condition for arithmetics [ $VAR1 OP $VAR2 ] true if file exists. OP := -gt -eq -ne -lt -ge -le
  60. 60. AgendaGeneral Info Underwater Overview Syntax Scripting Examples 19.06.2013 03.07.2013 @pvb265 #imolug 19.06 03.07
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