Case insensitive comparison of strings in shell script

In Bash, you can use parameter expansion to modify a string to all lower-/upper-case:

var1=TesTvar2=tEstecho ${var1,,} ${var2,,}echo ${var1^^} ${var2^^}

string shell compare case-insensitive

All of these answers ignore the easiest and quickest way to do this (as long as you have Bash 4):

if [ "${var1,,}" = "${var2,,}" ]; then  echo ":)"fi

All you're doing there is converting both strings to lowercase and comparing the results.

string shell compare case-insensitive

if you have bash

str1="MATCH"str2="match"shopt -s nocasematchcase "$str1" in $str2 ) echo "match";; *) echo "no match";;esac

otherwise, you should tell us what shell you are using.

alternative, using awk

str1="MATCH"str2="match"awk -vs1="$str1" -vs2="$str2" 'BEGIN {  if ( tolower(s1) == tolower(s2) ){    print "match"  }}'

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