Here are the top 3 ways for converting a string to lowercase in Bash. Using tr One of the most popular ways for lowercasing a string is using tr. This is a POSIX standard method for accomplishing the task. 1echo "I WANT this LoWeRcAsEd" | tr '[:upper:]' '[:lower:]' 2# Outputs: i want this lowercasedUsing awk Another POXIS standard is using awk’s native toLower method. 1echo "I WANT this LoWeRcAsEd" | awk '{print tolower($0)}' 2# Outputs: i want this lowercasedUsing Bash 4.
