Advanced bash-scripting guide by Mendel Cooper

By Mendel Cooper

This rfile is either an educational and a reference on shell scripting with Bash. It assumes no past wisdom of scripting or programming, yet progresses swiftly towards an intermediate/advanced point of guideline. The workouts and heavily-commented examples invite energetic reader participation. nonetheless, it's a paintings in development. The purpose is so as to add a lot supplementary fabric in destiny updates to this record, because it evolves right into a complete e-book that fits or surpasses any of the shell scripting manuals in print.

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Note that || operator not permitted within [ ... ] construct. Bash tests the exit status of each statement linked with a logical operator. Example 8−2. " fi # ERROR: if [ "$a" −eq 24 && "$b" −eq 47 ] # attempts to execute ' [ "$a" −eq 24 ' # and fails to finding matching ']'. ) # Thanks, Stephane Chazelas. " fi Chapter 8. Operations and Related Topics 56 Advanced Bash−Scripting Guide # The −a and −o options provide #+ an alternative compound condition test. # Thanks to Patrick Callahan for pointing this out.

Example 5−7. /bin/bash # Using 'shift' to step through all the positional parameters. /shft a b c def 23 skidoo until [ −z "$1" ] do echo −n "$1 " shift done echo # Until all parameters used up... # Extra line feed. 4. Special Variable Types 30 Chapter 6. Quoting Quoting means just that, bracketing a string in quotes. This has the effect of protecting special characters in the string from reinterpretation or expansion by the shell or shell script. sh bash$ ls −l '[Vv]*' ls: [Vv]*: No such file or directory Certain programs and utilities can still reinterpret or expand special characters in a quoted string.

Extra line feed. 4. Special Variable Types 30 Chapter 6. Quoting Quoting means just that, bracketing a string in quotes. This has the effect of protecting special characters in the string from reinterpretation or expansion by the shell or shell script. sh bash$ ls −l '[Vv]*' ls: [Vv]*: No such file or directory Certain programs and utilities can still reinterpret or expand special characters in a quoted string. This is an important use of quoting, protecting a command−line parameter from the shell, but still letting the calling program expand it.

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