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Questions specific to GNU’s Bourne Again SHell, as opposed to other Bourne/POSIX shells. For questions about Unix shells in general, use the /shell tag instead.

0
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If you want to detect only digits (not other character types) you should use a simple regular expression. [[ ${numbers} =~ ^([[:digit:]]) ]] && var=${BASH_REMATCH[1]} In $var is a digit or it is em …
answered Apr 2 '18 by Marco
2
votes
In bash I found the following: unset MY_VARIABLE : ${MY_VARIABLE='my_value'} MY_VARIABLE=${MY_VARIABLE:+$( false )}${MY_VARIABLE:-'this_will_fail_with_exit_1'} echo $? echo $MY_VARIABLE This prints: 1 my_value …
answered May 8 '18 by Marco