Read e-book online Advanced Bash−Scripting Guide. An in−depth exploration of PDF

By Cooper M.

This educational assumes no prior wisdom of scripting or programming, yet progresses speedily 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 guide for self-study, and a reference and resource of data on shell scripting strategies. The routines and heavily-commented examples invite lively reader participation, below the idea that the single method to quite study scripting is to put in writing scripts.

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Note that && operator not permitted within [ ... ] construct. && may also, depending on context, be used in an and list to concatenate commands. || or (logical) if [ $condition1 ] || [ $condition2 ] # Same as: if [ $condition1 −o $condition2 ] # Returns true if either condition1 or condition2 holds true... if $condition1 # Also works. # Note that || operator not permitted within [ ... ] construct. Bash tests the exit status of each statement linked with a logical operator.

3. Bash Variables Are Untyped Unlike many other programming languages, Bash does not segregate its variables by "type". Essentially, Bash variables are character strings, but, depending on context, Bash permits integer operations and comparisons on variables. The determining factor is whether the value of a variable contains only digits. Example 4−4. Integer or string? Chapter 4. sh: Integer or string? a=2334 let "a += 1" echo "a = $a " echo # Integer. b=${a/23/BB} # # # # # echo "b = $b" declare −i b echo "b = $b" let "b += 1" echo "b = $b" echo c=BB34 echo "c = $c" d=${c/BB/23} echo "d = $d" let "d += 1" echo "d = $d" echo # a = 2335 # Integer, still.

Example 4−5. " Chapter 4. " # Strips out path name info (see 'basename') echo if [ −n "$1" ] then echo "Parameter #1 is $1" fi # Tested variable is quoted. # Need quotes to escape # if [ −n "$2" ] then echo "Parameter #2 is $2" fi if [ −n "$3" ] then echo "Parameter #3 is $3" fi # ... if [ −n "${10}" ] # Parameters > $9 must be enclosed in {brackets}. " fi echo exit 0 The bracket notation for positional parameters leads to a fairly simply way of referencing the last argument passed to a script on the command line.

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Advanced Bash−Scripting Guide. An in−depth exploration of the gentle art of shell scripting by Cooper M.


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