By Cooper M.
This instructional assumes no earlier wisdom of scripting or programming, yet progresses quickly towards an intermediate/advanced point of guideline ...all the whereas sneaking in little snippets of UNIX knowledge and lore. It serves as a textbook, a handbook for self-study, and a reference and resource of data on shell scripting recommendations. The workouts and heavily-commented examples invite energetic reader participation, less than the idea that the one solution to fairly examine scripting is to jot down scripts.
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Additional resources for Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting
Gcd $1 $2 Chapter 8. Operations and Related Topics 56 Advanced Bash−Scripting Guide echo; echo "GCD of $1 and $2 = $dividend"; echo # Exercise : # −−−−−−−− # Check command−line arguments to make sure they are integers, #+ and exit the script with an appropriate error message if not. exit 0 += "plus−equal" (increment variable by a constant) let "var += 5" results in var being incremented by 5. −= "minus−equal" (decrement variable by a constant) *= "times−equal" (multiply variable by a constant) let "var *= 4" results in var being multiplied by 4.
Constructs also return an exit status of 0 if the arithmetic expressions they evaluate expand to a non−zero value. These arithmetic expansion constructs may therefore be used to perform arithmetic comparisons. let "1<2" returns 0 (as "1<2" expands to "1") (( 0 && 1 )) returns 1 (as "0 && 1" expands to "0") • An if can test any command, not just conditions enclosed within brackets. if cmp a b &> /dev/null # Suppress output. " fi • An if/then construct can contain nested comparisons and tests. " if [[ $comparison = "integer" ]] then (( a < b )) else [[ $a < $b ]] fi then echo '$a is less than $b' fi This detailed "if−test" explanation courtesy of Stephane Chazelas.
Bash responds to a missing close−bracket with an error message. " fi echo if /usr/bin/[ −z "$1" # Again, functionally identical to above. # if /usr/bin/[ −z "$1" ] # Works, but gives an error message. " fi echo exit 0 The [[ ]] construct is the shell equivalent of [ ]. This is the extended test command, adopted from ksh88. No filename expansion or word splitting takes place between [[ and ]], but there is parameter expansion and command substitution. " fi Chapter 7. Tests 44 Advanced Bash−Scripting Guide Using the [[ ...
Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting by Cooper M.