What does the following bash command do?
"${ctp// /}"
I want to check whether a variable is composed of an empty string or is all spaces, so that I can assign a default value.
Bash command on a variable
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It removes any space characters.
Parameter Expansion expands parameters:
$foo,$1. You can use it to perform string or array operations:"${file%.mp3}","${0##*/}","${files[@]: -4}". They should always be quoted.See: http://mywiki.wooledge.org/BashFAQ/073 and "Parameter Expansion" in man bash.
Also see http://wiki.bash-hackers.org/syntax/pe