example08.42

UNIX[1].shell范例精解(第4版)_code

#!/bin/sh
# This program demonstrates the scope of variables when 
# assigned within loops where the looping command uses 
# redirection. A subshell is started when the loop uses 
# redirection, making all variables created within the loop 
# local to the shell where the loop is being executed.
while read line
do
	echo $line    # This line will be redirected to outfile
	name=JOE
done < testing > outfile  # Redirection of input and output
echo Hi there $name