example14.22

Unix Shell编程权威指南的配套源代码,书是好书,不过习题没有答案,要自己做了

if [ "$name" = "" ]     # Alternative to  [ ! "$name" ]
                        # or [ -z "$name" ]
then
	echo The name variable is null
fi

# (From System showmount program, which displays all remotely mounted systems)
remotes=$(/usr/sbin/showmount)
if [ "X${remotes}" != "X" ] 
then
	/usr/sbin/wall ${remotes}
	             # ...
fi