New PDF release: Advanced bash-scripting guide

By Mendel Cooper

This is often the whole reference at the Borne back shell (bash). quantity 1Volume 2 includes all appendices.

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4 fi # $unassigned is NULL. Using a variable before assigning a value to it may cause problems. It is nevertheless possible to perform arithmetic operations on an uninitialized variable. 1 2 3 4 5 6 7 8 9 echo "$uninitialized" let "uninitialized += 5" echo "$uninitialized" # # #+ # #+ # (blank line) # Add 5 to it. # 5 Conclusion: An uninitialized variable has no value, however it acts as if it were 0 in an arithmetic operation. This is undocumented (and probably non-portable) behavior, and should not be used in a script.

Prefix for an operator. Prefix for a default parameter in parameter substitution. " fi param2=${param1:-$DEFAULTVAL} # ^ -The double-dash -- prefixes long (verbatim) options to commands. sort --ignore-leading-blanks Used with a Bash builtin, it means the end of options to that particular command. This provides a handy means of removing files whose names begin with a dash. bash$ ls -l -rw-r--r-- 1 bozo bozo 0 Nov 25 12:29 -badname bash$ rm -- -badname bash$ ls -l total 0 The double-dash is also used in conjunction with set.

Home Up Next Introduction to Variables and Parameters Advanced Bash-Scripting Guide: An in-depth exploration of the art of shell scripting Next Chapter 4. Introduction to Variables and Parameters Variables are how programming and scripting languages represent data. A variable is nothing more than a label, a name assigned to a location or set of locations in computer memory holding an item of data. Variables appear in arithmetic operations and manipulation of quantities, and in string parsing. 1.

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Advanced bash-scripting guide by Mendel Cooper

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