<![CDATA[
#!/bin/ksh
# A shell script to be run in the background, watch will
# check each minute and report on who logs in and who logs out.
#
# Written by Wayne Pollock, Tampa Florida 1996.
# Security:
PATH=/bin:/usr/bin # Use standard executables only
umask 066 # Temporary files are created with mode 600
# Temporary files:
new=/tmp/new.$$
old=/tmp/old.$$
# Cleanup when done:
trap 'rm -f $new $old 2>/dev/null' 0 1 2 3 15
who >$old # Initialize the old list.
# The main program:
while : # Do forever
do
who >$new
diff $old $new
mv $new $old
sleep 60
done |awk '/>/ {$1 = "Just logged in: "; print}
/</ {$1 = "Just logged out: "; print}
' # End of awk program
]]>
|