Advanced Bash-Scripting Guide by Mendel Cooper

By Mendel Cooper

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

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Fi echo if /usr/bin/[ -z "$1" ] # Again, functionally identical to above. # if /usr/bin/[ -z "$1" # Works, but gives an error message. x. " fi echo exit 0 The [[ ]] construct is the more versatile Bash version 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 Using the [[ ... ]] test construct, rather than [ ... ] can prevent many logic errors in scripts.

Quoting # # # # # # # Simple escaping and quoting z \z \z \\z \z \z # # # # # # # # # Command substitution z z \z \z \z \\z \z \z 43 Advanced Bash-Scripting Guide # Here document cat <

Echo >&2 # The '-s' makes anything typed silent, #+ so it is necessary to go to new line explicitly. read -n 1 -s -p $'Control-J leaves cursor on next line. \x0a' # '0a' is the hex equivalent of Control-J, linefeed. ' echo >&2 # Control-K is vertical tab. # A better example of the effect of a vertical tab is: var=$'\x0aThis is the bottom line\x0bThis is the top line\x0a' echo "$var" # This works the same way as the above example. However: echo "$var" | col # This causes the right end of the line to be higher than the left end.

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