emptying a file and keeping its ownership
John Poplett
john at cstreet.com
Tue Jan 1 07:19:51 AEST 1991
In article <1990Dec30.220722.29050 at jarvis.csri.toronto.edu> ckchee at dgp.toronto.edu (Chuan Chee) writes:
>I have SCO Xenix 2.2.3. What's the easiest way to "empty" a file
>while keeping its ownership (owner,group) and access permissions the
>same? Actually I only care about permissions (rw-rw-rw).
>I would like this done in Bourne shell (or possibly CSH).
>One other thing, this shell script is run under root.
>
The simplest way to truncate a file using the Bourne shell
is:
> file
Here's a short Bourne shell script that truncates files. Cut it
out and save it to trunc.sh and run "make trunc" to get an executable
script file.
John
------ cut here -------- cut here -------- cut here --------
:
# @(#)trunc.sh -- truncate or create empty files. Optionally, setting
# owner or group ID.
usage()
{
echo "usage: $0 [-o owner] [-g group] file1 [file2...]" 1>&2
exit 1
}
if [ $# -lt 1 ]
then
usage
fi
set -- `getopt g:o: $*`
if [ $? != 0 ]
then
usage
fi
for i in $*
do
case $i in
-g) group=$2; shift; shift;;
-o) owner=$2; shift; shift;;
--) shift; break;;
esac
done
for file in $*
do
> $file
done
if [ $group ]
then
chgrp $group $*
fi
if [ $owner ]
then
chown $owner $*
fi
exit 0
--
John Poplett @ C Street Software | Never make forecasts, especially
312 Wolff St. Oxnard, Ca. 93033 USA | about the future.
(805) 486-7807 / john at cstreet.com | ~ Sam Goldwyn
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