Shell Scripting

You will be able to

• Create an executable script with a shebang, arguments and a meaningful exit status.
• Make decisions with if, test, [ ] and case, and validate input before acting.
• Repeat work with for and while loops over lists, files and command output.
• Capture and process command output with command substitution, pipes and read.

Lessons

1. 01Your first script: shebang, arguments and exit statusTurn commands you type into a file you can run, give it inputs with $1 and $2, and make it report success or failure.bashchmodbash -nbash -x$1$#0/5 exercises
2. 02Making decisions: if, test and caseTest files, strings and numbers, combine tests, and choose between several actions.iftest[ ][[ ]]case&&0/5 exercises
3. 03Repeating work: for, while and untilDo the same thing to a list of names, files or lines, and stop or skip when you need to.forwhileuntilreadbreakcontinue0/5 exercises
4. 04Processing command outputCapture what a command prints, parse it with the tools you already know, and build small useful scripts from the pieces.$( )| while readawkcutgrep -csort | uniq -c0/5 exercises