The first thing that we need to do is create the script with our desired code. Let’s say that we want to convert “example” into “EXAMPLE”. There is a solution in the Bash shell.
Let us use the power of Bash here, The script does this by using the built-in ${my_variable^^} (the carrot symbol, two times)
Example of changing the case from lower to upper:
Step #1:- Set a variable with a lowercase value.
[email protected]:~$ my_variable=codetryoutStep #2:- Print the variable, before changing the character case.
[email protected]:~$ echo $my_variable
codetryoutStep #3:- Change the case to uppercase (change to all capital letters) and print again:
[email protected]:~$ echo ${my_variable^^}
CODETRYOUTThis is very useful when you want to process any user input, regardless of its case. Here is another example.
# Entering all lowercase - yes
[email protected]:~$ read userinput
yes
[email protected]:~$ [[ ${userinput^^} == YES ]] && echo YES
YES
# Entering Yes, in mixed case - Yes
[email protected]:~$ read userinput
Yes
[email protected]:~$ [[ ${userinput^^} == YES ]] && echo YES
YES
# Entering all in uppercase - YES
[email protected]:~$ read userinput
YES
[email protected]:~$ [[ ${userinput^^} == YES ]] && echo YES
YESThis guide explained shell scripts to convert string to uppercase. I hope this is useful for you, if you have questions, please let us know.