'How to convert ouput into uppercases in kali linux shell

I need to convert from 'ifconfig' command output to Uppercases:

I've tried like this:

ifconfig | tr [:upper:]
bashshellkali-linux


Solution 1:[1]

By default Kali Linux uses bash as the default shell. To convert the output of ifconfig from lowercase to uppercase in a bash shell run the following command:

ifconfig | tr '[:lower:]' '[:upper:]'

The | character is used to pipe the output of ifconfig to tr '[:lower:]' '[:upper:]' . The tr command in bash understands the POSIX keywords :lower: and :upper: because bash is a POSIX-compliant shell.

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