An issue with double brackets in shell scripting
I have a shell script which gets executed. In the script I have:
if [[ $variable == *something* ]]; then
do something
fi
My issue here is that running the script returns "[[ not found".
From reading other answers, it looks like not all shells recognize double brackets, however, I am not sure what the solution is, what is the equivalent of that code?
It sounds like your shell is POSIX sh , which does not have the [[ builtin. Possible solutions include translating it to an expression that works for sh or changing the shebang line to be #!/bin/bash . Changing the shebang is generally the best solution.
You may have a POSIX sh if you're on Ubuntu, they use dash.
I know only single brackets, did you try it with only one bracket each? otherwise you could use test instead.
POSIX-standard solution:
if test echo "${variable}" | grep -q 'something'
then
# do something
fi
that will ALWAYS work :)
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