October 8, 2012 02:32
diff --git a/logon.sh.txt b/logon.sh.txt
 #!/bin/sh
 # Judge a user is logged on or not 
 #

 user="$1"
 if who | grep -w "$user">/dev/null 
 then 
    echo "$user is logged on "
 else 
    echo "$user is NOT logged on"

 fi
	#!/bin/sh
	# Judge a user is logged on or not
	#

	user="$1"
	if who \| grep -w "$user">/dev/null
	then
	echo "$user is logged on "
	else
	echo "$user is NOT logged on"

	fi