Overwrite a file with another. (Rated 0)Description:
Overwrite one file with another. From "The Unix Programming Environment". Code starts here
#!/bin/sh
#overwrite: overwrite file with output of command
#note: must use redirection of input from file in command if required
opath=$PATH
PATH=/bin:/usr/bin:/usr/local/bin
case $# in
0|1) echo 'Usage: overwrite file cmd [args]' 1>&2; exit 2
esac
file=$1; shift
new=/tmp/overwr1.$$; old=/tmp/overwr2.$$
trap 'rm -f $new $old; exit 1' 1 2 15
export PATH=$opath;
if "$@" > $new
then
cp $file $old
trap '' 1 2 15
cp $new $file
else
echo "overwrite: $1 failed, $file unchanged" 1>&2
rm -f $new $old
exit 1
fi
rm -f $new $old
Submitted by Devscripts on 27-02-2003 20:35 |
