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![Shell Function function log { if [ $# gt 0 ]; then echo "[$(date +"%D %T")] $@" >> $LOG_FILE db "$@" else while read data do echo "[$(date +"%D %T")] $data" >> $LOG_FILE db "$data" done fi } log “Hello World!” echo “Hello World!” | log](https://image.slidesharecdn.com/csi-conference-tkm-bash-presentation-zyxware-anoop-2012-09-15-121106044348-phpapp01/75/Introduction-to-Bash-Scripting-Zyxware-Technologies-CSI-Students-Convention-Sep-15-2012-10-2048.jpg)
![If Command if [[ expression ]] then commands; elif [[ expression ]] then commands; else commands; fi](https://image.slidesharecdn.com/csi-conference-tkm-bash-presentation-zyxware-anoop-2012-09-15-121106044348-phpapp01/75/Introduction-to-Bash-Scripting-Zyxware-Technologies-CSI-Students-Convention-Sep-15-2012-13-2048.jpg)
![For Loop for NAME [in LIST ]; do COMMANDS; done i=0 for filename in `ls`; do i=$(( i + 1)); printf "%5s %sn" $i “$filename”; done; for name in Anoop John; do echo “Hello ${name}”; done;](https://image.slidesharecdn.com/csi-conference-tkm-bash-presentation-zyxware-anoop-2012-09-15-121106044348-phpapp01/75/Introduction-to-Bash-Scripting-Zyxware-Technologies-CSI-Students-Convention-Sep-15-2012-15-2048.jpg)
![While Loop while [[ expression ]]; do COMMANDS; done i=0; while [[ $i lt 10 ]]; do echo Counting $i; ((i+=1)); done; while read line do echo $line done < path/to/file](https://image.slidesharecdn.com/csi-conference-tkm-bash-presentation-zyxware-anoop-2012-09-15-121106044348-phpapp01/75/Introduction-to-Bash-Scripting-Zyxware-Technologies-CSI-Students-Convention-Sep-15-2012-16-2048.jpg)
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Introduction to Bash Scripting, Zyxware Technologies, CSI Students Convention, Sep 15, 2012
The document introduces Bash shell scripting, covering topics like shell operation, commands, environment variables, and scripting structures such as loops and conditionals. It also discusses tools like awk, grep, and sed, alongside practical examples and useful commands. Additionally, it provides guidance on getting started with GNU/Linux and automating tasks through scripts.
Introduction to Bash Scripting, Zyxware Technologies, CSI Students Convention, Sep 15, 2012
- 1. Shell Automation AnIntroduction to Bash Shell Scripting Anoop John
- 2. An Outline ►Shell, interpreter,POSIX ►Shell script operation ►Commands, paths, returns ►Variables, environments ►Input, output, pipes, descriptors ►Expressions, conditions, loops ►Awk, grep, sed, find, xargs ►System utils ►Examples
- 3. Shell, Interpreter, POSIX ►Kernel,Shell ►Interprets commands ►Command Line Interpreter / Command Line Interface ►POSIX compliance ►Sh, Bourne Again, Brian Fox, FSF
- 4. Free Software ►Unix ►GNU ►GPL -Four freedoms ►Use, Modify, Distribute, Modify & Redistribute ►FSF ►GNU / Linux
- 5. Shell Operation ►Reads inputfrom file, string (-c), or terminal ►Breaks the input into words and operators ►Parses the tokens into simple and compound commands ►Performs the various shell expansions ►Performs any necessary redirections ►Executes the command ►Optionally waits for the command to complete and collects its exit status
- 6. Commands ►Executables (ls) ►Shell commands(cd, exit, pwd) ►Return values ►Command input ►Command output ►Path ►Which
- 7. Variables & Environment ►Settinga Variable ►Environment (context) ►Script ►Eval ►Exec ►Source . ►Strings, integers, arrays ►Quoting - single, double, escaping ►Global, local
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- 9. Arguments & Functions ►ShellScripts ►Shell Arguments ►Functions ►Function Arguments
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- 12. Expressions ►Assignment = ►Arithmetic +,-, *, /, **, ►Bitwise <<, >>, |, &, ~, ^ ►Logical !, &&, || ►Comparisons - Arithmetic -eq, -ne, -lt, -gt, le ►Comparisons - String =, !=, <, >, <= ►Filesystem - -e, -f, -d, -x
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- 17. Shell Swiss ArmyKnives ►awk ►sed ►grep ►find ►xargs ►cat, less, tail, head, watch
- 18. Useful Commands ►ps ►top ►kill ►dmesg ►curl, wget ►chown,chmod, chgrp ►uptime, top, nice, nohup
- 19. Getting help ►man ►help ►command --help ►Readingscripts ►Mailing lists ►User groups ►Local community ►Search the web
- 20. How to Start ►GetGNU / Linux installed on your systems ►Start using shell ►Identify pain points in your daily operations ►Automate through scripts ►Join a mailing list ►Ask & answer questions ►Show off :-)
- 21. Exempli Gratia ►Drupal Backups ►AsianetAutologin ►Reliance Autologin ►Secure Shared Folders
- 22. About Zyxware ►Free SoftwareCompany ►Software Development - Drupal ►Leading Drupal Contributor from India ►FSF Contributing Member ►Free Software Support in the local market ►IT Training and FOSS Enabling ►Websites & Email Services ►IT Consultancy for Enterprises
- 23. Thank You! www.zyxware.com info@zyxware.com 9446-06-9446