Create Dynamic if condition

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Old 05-11-2015
Originally Posted by RudiC
With a recent bash, try
[[ "$(tail -${LEFT_OVR} color.txt | tr '\n' ' ' )" =~ "$color" ]] && echo good || echo bad

Originally Posted by wahi80
Can you explain, how above command works, in building the if condition?
That is an "abbreviated if construct" in recent bash (and other recent shells). If the result of the [[ ... ]] compound command is true, the && command is executed, if false, the || command.
cf. man bash :
An additional binary operator, =~, is available... When it is used, the string to the right of the operator is considered an extended regular expression and matched accordingly.
So above looks for the $color in the string built from the LEFT_OVR lines tailed from the file.
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