Bash, checking variable

Question

Ok, so I'm trying to run a script where if the user enters y or Y, then the output is YES but if the user inputs n or N then the output is NO, this is what I have so far:

read character
if (( ("$character") == "y" )) || (( ("$character" == "Y") )); then
echo "YES"
else
echo "NO"
fi

When I run this code I get YES successfully but inputting n just results in YES anyway.

I have no idea what I'm doing wrong and any I'd love some input.

Thanks in advance!

anubhava · Accepted Answer · 2014-10-20 06:22:02Z

4

((...)) is used for math calculations. You can use [[...]] in BASH like this:

read character
if [[ "$character" == [yY] ]]; then
   echo "YES"
else
   echo "NO"
fi

Also I have combined 2 conditions into one using [yY] glob pattern.

answered Oct 20, 2014 at 6:22

anubhava

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1 Comment

anubhava Over a year ago

[yY] is also a glob pattern that is matched by ==

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