Download Advanced Bash-Scripting Guide. A complete guide to shell by Cooper M. PDF

By Cooper M.

The complicated Bash Scripting advisor is either a reference and an academic on shell scripting. This accomplished publication (the identical of approximately 646 print pages) covers nearly each point of shell scripting. It comprises over three hundred profusely commented illustrative examples, and a few tables. not only a shell scripting educational, this e-book additionally offers an advent to easy programming ideas, reminiscent of sorting and recursion. it really is compatible for both person examine or lecture room use.

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Additional info for Advanced Bash-Scripting Guide. A complete guide to shell scripting

Sample text

1 <−−− $2, $2 <−−− $3, $3 <−−− $4, etc. The old $1 disappears, but $0 does not change. If you use a large number of positional parameters to a script, shift lets you access those past 10, although {bracket} notation also permits this (see Example 5−5). 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.

Or (logical) if [ $condition1 ] || [ $condition2 ] # Same as: if [ $condition1 −o $condition2 ] # Returns true if either condition1 or condition2 holds true... if $condition1 # Also works. # Note that || operator not permitted within [ ... ] construct. Bash tests the exit status of each statement linked with a logical operator. Example 8−2. " fi # ERROR: if [ "$a" −eq 24 && "$b" −eq 47 ] # attempts to execute ' [ "$a" −eq 24 ' # and fails to finding matching ']'. ) # Thanks, Stephane Chazelas.

Using a variable before assigning a value to it will inevitably cause problems. 2. Variable Assignment = the assignment operator (no space before & after) Do not confuse this with = and −eq, which test, rather than assign! Note that = can be either an assignment or a test operator, depending on context. Example 5−2. , lacking the '$' in front? # When it is being assigned, rather than referenced. 2. Variable Assignment 25 Advanced Bash−Scripting Guide # In echo read echo a 'read' statement (also a type of assignment) −n "Enter \"a\" " a "The value of \"a\" is now $a" echo exit 0 Example 5−3.

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