On Fri, Mar 25, 2011 at 02:25:35PM -0700, tytus64 wrote: > while read line > do > line_num=`expr $line_num + 1` > echo $line_num: $line >> ./out.log > done < $log_file
Although it's not directly related to your question, I feel obliged to point out that you can increment a variable without forking an external expr command: line_num=$((line_num+1)) # POSIX sh compatible or ((line_num++)) # Bash only You only need expr when writing for the Bourne shell.
