tr command queston??

[johny doe]

Use tr command to substitute all lower-case letters for upper-case ones and vice versa, i.e. upper-case to lower-case. Use manual or any other source to learn the tr command

[Pat Farrell]

What's your question?


did you read the man page for 'tr'?
Do you understand regular expressions?

[johny doe]

these is my assigment

=========
Use tr command to substitute all lower-case letters for upper-case ones and vice versa, i.e. upper-case to lower-case. Use manual or any other source to learn the tr command
===========

i read the tr man and the only thing
that i think could help me is
[:lower:]
[:upper:]

how do i make this command??

[Freddy Wong]

Here's some example.

    
echo "hello world" | tr [:lower:] [:upper:]

[johny doe]

its only changes all the letters to upper case

how do i change it so it will change all the lower case letters
to upper case

and all the upper case to lower case
???

[johny doe]

i solved it thanks

[Stefan Wagner]

You mean meanwhile changing in both directions?
How did you solve it?

[johny doe]

echo "Hello WORLd " | tr '[:lower:] [:upper:]' '[:upper:] [:lower:]'

[Stefan Wagner]

I didn't knew it is possible. Thanks.