unixpipelinetr

Unix tr command to convert lower case to upper AND upper to lower case

So I was searching around and using the command tr you can convert from lower case to upper case and vice versa. But is there a way to do this both at once?

So:

$ tr '[:upper:]' '[:lower:]' or  $ tr A-Z a-z

Will turn "Hello World ABC" to "hello world abc", but what I want is "hELLO wORLD abc".

Solution

  • This will do what you are looking for:

     tr '[:upper:][:lower:]' '[:lower:][:upper:]'