numberit

UNIX[1].shell范例精解(第4版)_code

#!/bin/sh
# Program name: numberit
# Put line numbers on all lines of memo
if [ $# -lt  1 ] 
then
	echo  "Usage: $0 filename " >&2
	exit 1
fi
count=1                      # Initialize count
cat $1 | while read line    
# Input is coming from file on command line
do
	[ $count -eq 1 ] && echo "Processing file $1..." > /dev/tty  
	echo $count $line
	count=`expr $count + 1`
done > tmp$$	 		                # Output is going to a temporary file