vi - changing case
As most system administrators, I use the vi text editor a ton in my job. So I am familiar with all the common commands you can run. Today I was wondering if it was possible to change lower case to upper case letters and the opposite, from upper case to lower case letters.
Here’s how you do it:
change all lower case to upper case (CAPITAL LETTERS):
:%s/^.*$/\U&/g
change all upper case to lower case (small letters):
:%s/^.*$/\L&/g
Of course, the % is the entire document, the s///g is search and replace the entire line, ^.*$ matches everything, and the important part \L& converts to lower case and \U& converts to upper case.
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