Question

My script takes a file name in the form R#TYPE.TXT (# is a number and TYPE is two or three characters).
I want my script to give me TYPE. What should I do to get it? Guess I need to use awk and sed.

I’m using /bin/sh (which is a requirement)

Answer 1

you can use awk

$ echo R1CcC.TXT | awk '{sub(/.*[0-9]/,"");sub(".TXT","")}{print}'
CcC

or

$ echo R1CcC.TXT | awk '{gsub(/.*[0-9]|\.TXT$/,"");print}'
CcC

and if sed is really what you want

$ echo R9XXX.TXT | sed 's/R[0-9]\(.*\)\.TXT/\1/'
XXX