I want to compare 2 strings with ignore case in bash shell.

Suppose, if [ "test" = "TEst" ] ... should be true and enter into if loop.

Solution:

Please try this:

if [ `echo "TeSt" | tr -s '[:upper:]' '[:lower:]` = `echo "Test" | tr -s '[:upper:]' '[:lower:]` ]
then
echo "true"
else
echo "false"
fi

or

Try similar, it still worked.

input=TESt
input=`echo $input | tr '[A-Z]' '[a-z]'`

if [[ "$input" =~ "test" ]]; then
echo "equal"
else
echo "not equal"
fi

Note:

Do be aware in the 2nd example above, that, in the bash shell, the =~ is a binary operator, and everything to the right is a regular expression. Strictly speaking, it is not an equality check, but a matching operator?

This string would also be "equal" in your script above:

input="myTEStube"

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