Linuxcommands 091018105536-phpapp01

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Linuxcommands 091018105536-phpapp01

Linuxcommands 091018105536-phpapp01

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  • 1. Basic linux commands By, tha.suresh jemenisuresh@gmail.com Kanchi Lug Member
  • 2. LIST...● ls [options] [file|directory]● -l● will output the files and directories in long list format. -s, --size print the size of each file, in blocks -S sort by file size -a, --all do not ignore entries starting with .
  • 3. Examble for “ls”● arul@arul-desktop:~$ ls -l● total 9692● drwxr-xr-x 2 arul arul 4096 2009-10- 17 22:12 Desktop● drwxr-xr-x 2 arul arul 4096 2009-10- 17 22:35 Documents● drwxr-xr-x 2 arul arul 4096 2009-10- 17 17:58 event
  • 4. ● ls list all files● ls -l list all files with details● ls *.gif list gif files● ls *.gif -l list gif files with details● ls | wc -l count all files● ls *.gif | ws -l count gif files● (wc = word count)
  • 5. COPY...● cp [OPTION]... SOURCE DEST● cp is the Linux copy command, this shell command is used to copy files|directories from one location on the filesystem to another.
  • 6. options.● -f, --force● if an existing destination file cannot be opened, remove it and try again● -i, --interactive● prompt before overwrite● -R, -r, --recursive● copy directories recursively
  • 7. ● cp *.txt text● It will copy all files ending in .txt into the text directory.● To copy a file to your home directory: cp /usr/local/doc/ue.txt $HOME This copies the file ue.txt to your home directory
  • 8. ● To copy a file to the parent directory:● cp mail.txt ..● This copies the file mail.txt to the directory immediately above the current working directory.
  • 9. f, --force if an existing destination file cannot be opened,-remove it and try again• -i, --interactive prompt before overwrite• -l, --link link files instead of copying.• -p same as --preserve=mode,ownership,timestamps• -R, -r, --recursive copy directories recursively• -s, --symbolic-link make symbolic links instead of copying• -u, --update copy only when the SOURCE file is newer thanthe destination file or when the destination file is missing• -v, --verbose explain what is being done
  • 10. MOVE....● mv [OPTION]... [-T] SOURCE DEST● the Linux terminal command to move files| directories. Like the cp command, but deletes the original source.
  • 11. REMOVE...● rm -f [file]● option is if you are wanting to force a file to be removed● rm -r files● (recursive remove) Remove files, directories, and their subdirectories
  • 12. TOUCH....● arul@arul-desktop:~/Desktop$ ls● Home.desktop ShellIntro.pdf su trash.desktop● arul@arul-desktop:~/Desktop$ touch new new1 new2● arul@arul-desktop:~/Desktop$ ls● abc Home.desktop new new1 new2 ShellIntro.pdf su trash.desktop zxc
  • 13. CAT...● The Linux cat command is the Unix command to list a file’s contents onto your screen, or pass via pipeline to use with other Linux commands. The cat command comes from the word concatenate.
  • 14. ● arul@arul-desktop:~/Desktop$ cat new● arul@arul-desktop:~/Desktop$ vim new● arul@arul-desktop:~/Desktop$ cat new● sure● arul● shrini
  • 15. mkdir● The Linux command mkdir is used to make directories in Linux.● mkdir - make directories●
  • 16. Example● arul@arul-desktop:~/Desktop$ ls● abc Home.desktop new new1 new2 ShellIntro.pdf su trash.desktop zxc● arul@arul-desktop:~/Desktop$ mkdir comm● arul@arul-desktop:~/Desktop$ ls● abc comm Home.desktop new new1 new2 ShellIntro.pdf su trash.desktop zxc
  • 17. grep grep [OPTIONS] PATTERN [FILE...]● The Linux grep command is used to extract lines of data from files● arul@arul-desktop:~/Desktop$ grep sure new sure arul@arul-desktop:~/Desktop$ grep s new sure shrini
  • 18. WORD COUNT...● wc counts the characters,lines,words in a file.● Options:● -c output char., count● -l output lines count● -w output words count
  • 19. Example● wc -w linux.txt● 34● Display the word count for linux.txt● Defult: -clw
  • 20. WHO AM I● Find which user is loged shrinivasan@shrinivasan-laptop:~$ whoami shrinivasan
  • 21. DATE● For display the todays date.● Date prints the systems time and date.● shrinivasan@shrinivasan-laptop:~$ date● Sun Oct 18 13:46:29 IST 2009
  • 22. CALENDAR..● Cal prints an ASCII calendar of the current month.● Cal display the calendar● shrinivasan@shrinivasan-laptop:~$ cal October 2009 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  • 23. EXAMPLE● shrinivasan@shrinivasan-laptop:~$ cal 12 1988● December 1988● Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
  • 24. At command● shrinivasan@shrinivasan-laptop:~$ at 13:57● warning: commands will be executed using /bin/ sh● at> echo "hello" > hai● at> <EOT> shrinivasan@shrinivasan-laptop:~$ touch hai● shrinivasan@shrinivasan-laptop:~$ cat hai hello
  • 25. Ps● ps - report a snapshot of the current processes● To see every process on the system using BSD syntax:● ps -ax● ps -axu
  • 26. EXAMPLE● shrinivasan@shrinivasan-laptop:~$ ps -axu ● Warning: bad ps syntax, perhaps a bogus -? See http://procps.sf.net/faq.html ● USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND ● root 1 0.0 0.0 3084 1888 ? Ss 12:21 0:01 /sbin/init ● root 2 0.0 0.0 0 0? S< 12:21 0:00 [kthreadd] ● root 3 0.0 0.0 0 0? S< 12:21 0:00 [migration/0] ● root 4 0.0 0.0 0 0? S< 12:21 0:00 [ksoftirqd/0] ● root 5 0.0 0.0 0 0? S< 12:21 0:00 [watchdog/0] ● root 6 0.0 0.0 0 0? S< 12:21 0:00 [events/0] ● root 7 0.0 0.0 0 0? S< 12:21 0:00 [khelper] ● root 8 0.0 0.0 0 0? S< 12:21 0:00 [kstop/0] ● root 9 0.0 0.0 0 0? S< 12:21 0:00 [kintegrityd/0] ● root 10 0.0 0.0 0 0? S< 12:21 0:00 [kblockd/0] ● 1000 6967 0.0 0.1 8332 3124 ? S 12:55 0:00 /usr/lib/gvfs/gvfs-gphoto2-volume-monitor ● 1000 7253 1.7 2.0 125404 42836 ? S 13:03 1:02 /usr/bin/okular /home/shrini/Desktop/nice_linux_guide.pdf -icon okular - ● 1000 7343 4.2 5.8 246512 120996 ? Sl 13:04 2:30 /usr/lib/openoffice/program/soffice.bin -impress /home/shrini/Desktop/li ● postfix 10471 0.0 0.0 5792 1684 ? S 13:59 0:00 pickup -l -t fifo -u -c ● 1000 10698 0.0 0.0 2768 1032 pts/1 R+ 14:03 0:00 ps -axu ●
  • 27. Kill the opretion● Kill -9 6967● Warning: bad ps syntax, perhaps a bogus -? See http://procps.sf.net/faq.html● USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND● root 1 0.0 0.0 3084 1888 ? Ss 12:21 0:01 /sbin/init● root 2 0.0 0.0 0 0? S< 12:21 0:00 [kthreadd]● root 3 0.0 0.0 0 0? S< 12:21 0:00 [migration/0]● root 4 0.0 0.0 0 0? S< 12:21 0:00 [ksoftirqd/0]● root 5 0.0 0.0 0 0? S< 12:21 0:00 [watchdog/0]● root 6 0.0 0.0 0 0? S< 12:21 0:00 [events/0]● root 7 0.0 0.0 0 0? S< 12:21 0:00 [khelper]● root 8 0.0 0.0 0 0? S< 12:21 0:00 [kstop/0]● root 9 0.0 0.0 0 0? S< 12:21 0:00 [kintegrityd/0]● root 10 0.0 0.0 0 0? S< 12:21 0:00 [kblockd/0]● 1000 7253 1.7 2.0 125404 42836 ? S 13:03 1:02 /usr/bin/okular /home/shrini/Desktop/nice_linux_guide.pdf -icon okular -● 1000 7343 4.2 5.8 246512 120996 ? Sl 13:04 2:30 /usr/lib/openoffice/program/soffice.bin -impress /home/shrini/Desktop/li● postfix 10471 0.0 0.0 5792 1684 ? S 13:59 0:00 pickup -l -t fifo -u -c● 1000 10698 0.0 0.0 2768 1032 pts/1 R+ 14:03 0:00 ps -axu●
  • 28. TOP..● shrinivasan@shrinivasan-laptop:~$ top● top - 14:15:16 up 1:53, 1 user, load average: 0.74, 0.88, 0.75● Tasks: 152 total, 3 running, 149 sleeping, 0 stopped, 0 zombie● Cpu(s): 17.2%us, 3.3%sy, 0.0%ni, 79.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st● Mem: 2061340k total, 1424900k used, 636440k free, 63056k buffers● Swap: 1951856k total, 0k used, 1951856k free, 564504k cached●● PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND● 3963 shriniva 20 0 349m 135m 28m S 7.9 6.7 9:15.43 firefox-bin● 3433 root 20 0 356m 268m 6048 R 5.0 13.3 7:27.77 Xorg● 3916 shriniva 20 0 343m 53m 31m R 3.3 2.7 3:27.88 plasma● 3966 shriniva 20 0 134m 28m 17m S 2.0 1.4 0:23.26 konsole● 3944 shriniva 20 0 94168 26m 20m S 0.7 1.3 0:38.21 ktorrent● 11311 shriniva 20 0 2448 1212 912 R 0.7 0.1 0:00.12 top● 2657 mysql 20 0 124m 16m 4948 S 0.3 0.8 0:05.77 mysqld● 4039 shriniva 20 0 678m 52m 14m S 0.3 2.6 0:26.06 java● 1 root 20 0 3084 1888 564 S 0.0 0.1 0:01.41 init● 2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd● 3 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0● 4 root 15 -5 0 0 0 S 0.0 0.0 0:00.20 ksoftirqd/0● 5 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0● 6 root 15 -5 0 0 0 S 0.0 0.0 0:00.05 events/0●
  • 29. crontab● # m h dom mon dow command● 53 14 * 10 * echo"hai" > /root/shrini/home/hai● shrinivasan@shrinivasan-laptop:~$ cat hai● hello
  • 30. THANK YOU