h-finger

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:
##########################################################################
# Title      :	hfinger - show if sombody 'finger'ed you
# Author     :	Heiner Steven 
# Date       :	1994-08-30
# Category   :	System Administration
# SCCS-Id.   :	@(#) hfinger	1.2 03/12/19
##########################################################################
# Description
#
##########################################################################

PN=`basename "$0"`			# Program name
VER='1.2'

# Determine mail program knowing "-s" argument
Mail=mail
[ -x /bin/mailx ] && Mail=mailx

usage () {
    echo >&2 "$PN - show when somebody 'finger's you, $VER (stv '94)"
    exit 1
}

fatal () {
    for i
    do echo "$PN: $i" >&2
    done
    exit 1
}

: ${LOGNAME:=`who am i | cut -d' ' -f1`}			# receiver of mail
: ${FINGERMSG:=$HOME/TODO}			# file to print
: ${FINGERLOG:=$HOME/lib/finger.log}		# log file
Pipe=${TMPDIR:=/tmp}/info			# innocent name...
Plan=$HOME/.plan

[ $# -gt 0 -a X"$1" = X"-h" ] && usage
[ -r "$FINGERMSG" ] || fatal "file $FINGERMSG not found"

trap "rm -f $Pipe $Plan; [ -f $Plan.alt ] && mv $Plan.alt $Plan" 0
trap "exit 1" 1 2 3 15

[ -f "$Plan" ] && mv "$Plan" "$Plan".alt

mknod $Pipe p || fatal "cannot create named pipe"
chmod 744 $Pipe || fatal "cannot change mode of named pipe"
ln -s $Pipe $Plan || fatal "cannot create symbolic link"

while :
do
    # cp blocks on write to the named pipe until sombody
    # reads the pipe (i.e. with "finger")
    cp $FINGERMSG $Plan

    # somebody read the file .plan:
    $Mail -s "$PN" $LOGNAME <<!

*** $PN: sombody fingered you (`date`) ***

	$ netstat -n | grep ESTAB
`netstat -n | grep ESTAB`

	$ who
`who`

	$ w
`w`

	$ ps -auxww
`ps -auxww`
!
    echo "`date '+%y-%m-%d %H:%M:%S'`	somebody fingered me!" << $FINGERLOG
    sleep 2
done

exit 0				# never reached
	

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