Shell-script: variable default vaule at Jompeich d’er Bisente

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on Marzo 6, 2008

. Tags: default, p.def., por defecto, variable.

It’s possible to assign a default value to a variable in case it isn’t already defined. The syntax is:

FOO=${FOO:=bar}

Example:

$ FOO=${FOO:=bar}
$ echo $FOO
bar

$ BAR=test
$ BAR=${BAR:=foo}
$ echo $BAR
test

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