How to pass shell variable to awk command inside shell script

Question

I just want to pass a shell variable that stores name of a file to awk command. When I searched this problem on the net I see many different options but none of them worked for

Answer 1

To pass a shell variable to awk, you correctly used -v option.

However, the shift was unnecessary (you're iterating options with for), ;; was missing (you have to terminate each case branch), as well as was the name of the file for awk to process. Fixed, your script looks like:

#!/bin/bash
for i in "$@"; do
    case $i in
        -p=*|--producedfile=*)
            PFILE="${i#*=}"
            ;;
        *)
             # unknown option
            ;;
    esac
done

echo "PRODUCEDFILE = ${PFILE}"
awk  -v FILE="${PFILE}" '{print FILE, $0}' "${PFILE}"

Note however, awk already makes the name of the currently processed file available in the FILENAME variable. So, you could also write the last line as:

awk '{print FILENAME, $0}' "${PFILE}"