davidsen@sixhub.UUCP (Wm E. Davidsen Jr) (10/24/90)
The first post was pretty ugly, here's one with a man page and
slightly better command interface. This blanks console screens on Xenix
after a period of inactivity.
#!/bin/sh
# shar: Shell Archiver (v1.27)
#
# Run the following text with /bin/sh to create:
# scrnblank.1
# scrnblank
#
sed 's/^X//' << 'SHAR_EOF' > scrnblank.1 &&
X.TH scrnblank L local
X.SH NAME
Xscrnblank \- blank console after a period of inactivity
X.SH SYNOPSIS
Xscrnblank [ idle_mins [ inverval_sec ] ]
X.SH DESCRIPTION
XChecks periodically to see if all virtual consoles have been inactive
Xfor a length of time. If so the screen is blanked.
X
XIn your system rc file for user daemons (/etc/rc.d/7 directory) you can
Xadd the command "scrnblank &".
X.SH EXAMPLES
X scrnblank
X scrnblank 20
X scrnblank 1 20
X.SH LIMITATIONS
XThis program requires a virtual console dedicated as a blank screen.
XThis is not usually a problem.
X.SH FILES
X/etc/rc.d/7/
X.SH AUTHOR
XBill Davidsen, davidsen@crdos1.crd.ge.com
X.SH Copyright
XCopyright 1990 by Bill Davidsen, all rights reserved. May be freely used
Xand distributed.
SHAR_EOF
chmod 0644 scrnblank.1 || echo "restore of scrnblank.1 fails"
sed 's/^X//' << 'SHAR_EOF' > scrnblank &&
X#!/bin/sh
X
X# blank screen for Xenix @(#)scrnblank - v1.3, 10/23/90 19:22:10
X
X# ================ customize begins
X# this is the screen number for the blank screen
X# it should not be in use, preferably without a getty,
X# since the cursor is not restored. ie. tty07 would be 7
XBLANK_SCR=7
X#=============== end of customize features
X
X# calling sequence:
X# scrnblank [mins [interval]]
X# Checks every {interval} seconds (default 60) to see if all console
X# screens have been idle for {mins} minutes (default 5), and switches to
X# the virtual screen selected below and blanks it.
X
X# This is the time to wait in minutes.
X# It may be set from the command line, too
Xif [ $# -ge 1 ]
Xthen WAIT=$1
Xelse WAIT=5
Xfi #
X
X# this is the interval at which to test
Xif [ $# -ge 2 ]
Xthen LOOPSEC=$2
Xelse LOOPSEC=60
Xfi #
X
X# Logic:
X# the output of "who -u" is scanned to see if all console
X# logins are over N minutes unused. Then the screen is blanked
X# by setting cursor off and doing a clear screen.
X# This program must be run from a tty
X
Xwhile true; do
X who -u |
X awk '
X $2 ~ /tty[01][0-9]/ {
X # Get the time field
X time=substr($0, 38, 5)
X if (time == "old") continue
X split(time, xtime, ":")
X idle = 60*xtime[1] + xtime[2]
X if (WaitStart < idle) continue
X Active = 1
X }
X
X END {
X # really ugly way to change screens
X if (!Active) {
X # form the device name
X OutDev=sprintf("/dev/tty%02d", BlankScrn)
X # switch to the screen for blank use
X printf("\r\033[%02dz", BlankScrn-1) > OutDev
X # cursor off, CLS
X printf("\r\033[=14;10C\f", BlankScrn) > OutDev
X }
X }' WaitStart=$WAIT BlankScrn=$BLANK_SCR -
X
X sleep $LOOPSEC
Xdone
SHAR_EOF
chmod 0544 scrnblank || echo "restore of scrnblank fails"
exit 0
--
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
sysop *IX BBS and Public Access UNIX
moderator of comp.binaries.ibm.pc and 80386 mailing list
"Stupidity, like virtue, is its own reward" -me