I need to compare two strings and ignoring the case of the contents. IF [ $first != $second ]. Anything I can add to this command so that the comparison ignores the case.
1 Answer
In bash, you can perform case conversions easily e.g. if var="vAlUe" then
$ echo "${var^^}" VALUE while
$ echo "${var,,}" value You can use this to make you comparison case-insensitive by converting both arguments to the same case, i.e.
if [ "${first,,}" == "${second,,}" ]; then echo "equal" fi or
if [ "${first^^}" == "${second^^}" ]; then echo "equal" fi Another approach is to use the bash nocasematch option (thanks @Tshilidzi_Mudau), although this appears to work only with the [[ ... ]] extended test operator:
$ first=abc; second=ABC $ (shopt -s nocasematch; if [[ "$first" == "$second" ]]; then echo "Match"; else echo "No match"; fi) Match but
$ (shopt -s nocasematch; if [ "$first" == "$second" ]; then echo "Match"; else echo "No match"; fi) No match ~$ 
