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Best Shell Scripting course provider Navi Mumbai,Shell Scripting course details, Shell Scripting coaching center Navi Mumbai,Shell Scripting course syllabus navi mumbai,Shell Scripting courses Navi …

Best Shell Scripting course provider Navi Mumbai,Shell Scripting course details, Shell Scripting coaching center Navi Mumbai,Shell Scripting course syllabus navi mumbai,Shell Scripting courses Navi Mumbai,Shell Scripting course training center Navi Mumbai,Shell Scripting courses

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  • 1. Vibrant Technologies & Computers Shell scripting COURSE Make Career With Us!! B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173
  • 2. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Why Shell? • The commercial UNIX used Korn Shell • For Linux, the Bash is the default • Why Shell? – For routing jobs, such as system administration, without writing programs – However, the shell script is not efficient, therefore, can be used for prototyping the ideas • For example, % ls –al | more (better format of listing directory) % man bash | col –b | lpr (print man page of man)
  • 3. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in What is Shell? • Shell is the interface between end user and the Linux system, similar to the commands in Windows • Bash is installed as in /bin/sh • Check the version % /bin/sh --version
  • 4. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Pipe and Redirection • Redirection (< or >) % ls –l > lsoutput.txt (save output to lsoutput.txt) % ps >> lsoutput.txt (append to lsoutput.txt) % more < killout.txt (use killout.txt as parameter to more) % kill -l 1234 > killouterr.txt 2 >&1 (redirect to the same file) % kill -l 1234 >/dev/null 2 >&1 (ignore std output) • Pipe (|) – Process are executed concurrently % ps | sort | more % ps –xo comm | sort | uniq | grep –v sh | more % cat mydata.txt | sort | uniq | > mydata.txt (generates an empty file !)
  • 5. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Writing a Script • Use text editor to generate the “first” file #!/bin/sh # first # this file looks for the files containing POSIX # and print it for file in * do if grep –q POSIX $file then echo $file fi done exit 0 % /bin/sh first % chmod +x first %./first (make sure . is include in PATH parameter)
  • 6. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Syntax • Variables • Conditions • Control • Lists • Functions • Shell Commands • Result • Document
  • 7. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Environment Variables • $HOME home directory • $PATH path • $PS1 第一層提示符號 (normally %) • $PS2 第二層提示符號 (normally >) • $$ process id of the script • $# number of input parameters • $0 name of the script file • $IFS separation character (white space) • Use „env‟ to check the value
  • 8. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Loop Structure • Use wildcard „*‟ #!/bin/sh for file in $(ls f*.sh); do lpr $file done exit 0 Print all f*.sh files
  • 9. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Regular Expressions • Search for lines ending with “e” % grep e$ words2.txt • Search for “a” % grep a[[:blank:]] word2.txt • Search for words starting with “Th.” % grep Th.[[:blank:]] words2.txt • Search for lines with 10 lower case characters % grep –E [a-z]{10} words2.txt
  • 10. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Command • $(command) to execute command in a script • Old format used “`” but it can be confused with “‟” #!/bin/sh echo The current directory is $PWD echo the current users are $(who)
  • 11. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Arithmetic Expansion • Use $((…)) instead of expr to evaluate arithmetic equation #!/bin/sh x=0 while [ “$x” –ne 10]; do echo $x x=$(($x+1)) done exit 0
  • 12. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Debug • sh –n<script> set -o noexec check syntax set –n • sh –v<script> set -o verbose echo command before set –v • sh –x<script> set –o trace echo command after set –x set –o nounset gives error if undefined set –x set –o xtrace set +o xtrace trap „echo Exiting: critical variable =$critical_variable‟ EXIT
  • 13. B2/6/2 Vashi ,Navi Mumbai, Contact:09892900103/9892900173 shellscriptingtraining.vibranttechnologies.co.in enquiry@vibrantgroup.co.in shellscriptingtraining.vibranttechnologies.co.in Where to Get More Information Vibrant Group: www.vibrantgroup.co.in Vibrant Technologies & Computers www.vibranttechnologies.co.in/technologies.vibrantgroup.co. in Vibrant HR Team www.hr.vibrangroup.co.in