more on echo command
H. Morrow Long [Systems Center]
long at ittvax.UUCP
Tue Apr 16 10:30:34 AEST 1985
> While on the topic of "echo", it is remarkably hard to have a background
> process output just a bell character with no carriage return (to signal
> that it is done, say, while I am in a vi session). I had been using a
> 'C' routine for this purpose, and finally discovered that I could say:
> echo "^G\c"
> only to find out it does not work with UCB 4.2.
For a good time read the story of echo in Kernighan and Pike's
the Unix Programming Environment. The following program will
work under 4.2bsd.
#! /bin/sh
#
# Ring bell continuously, frequency varies with load average.
# To be really irritating to other users redirect the output
# to their terminals, i.e. 'annoy > /dev/ttyi4 &'.
#
while true
do
echo -n ""
done
--
H. Morrow Long
ITT-ATC Systems Center,
1 Research Drive Shelton, CT 06484
Phone #: (203)-929-7341 x. 634
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