On 19:59 13 Dec 2002, Ashley M. Kirchner <[EMAIL PROTECTED]> wrote:
| Theoretically, in my head, this ought to function, however I wanted
| to run it past by some of the shell guru's on here, see if anyone spots
| any logistical problems with this. I'm trying to run a particular
| command several time (it's a backup script, using cp/rsync). First, the
| script renames the old hierarchy of directories then performs the actual
| backup. So, you're looking at something like this:
|
| if [ -d $SNAPSHOT/daily.5 ] ; then \
| $MV $SNAPSHOT/daily.5 $SNAPSHOT/daily.6 ; \
| fi;
| if [ -d $SNAPSHOT/daily.4 ] ; then \
| $MV $SNAPSHOT/daily.4 $SNAPSHOT/daily.5 ; \
| fi;
| if [ -d $SNAPSHOT/daily.3 ] ; then \
| $MV $SNAPSHOT/daily.3 $SNAPSHOT/daily.4 ; \
| fi;
| if [ -d $SNAPSHOT/daily.2 ] ; then \
| $MV $SNAPSHOT/daily.2 $SNAPSHOT/daily.3 ; \
| fi;
| if [ -d $SNAPSHOT/daily.1 ] ; then \
| $MV $SNAPSHOT/daily.1 $SNAPSHOT/daily.2 ; \
| fi;
|
|
| My question is, can I shorten this with a FOR loop:
|
| for idx in 5 4 3 2 1 ; do \
| if [ -d $SNAPSHOT/daily.$idx ] ; then \
| $MV $SNAPSHOT/daily.$idx $SNAPSHOT/daily.`expr $idx + 1` ; \
| fi;
| done
Certainly.
BTW, you don't need all though sloshes, unless this came from a Makefile
(which I doubt because then there'd be lots of doubled $$s floating
around).
Eg:
for idx in 5 4 3 2 1
do if [ -d $$SNAPSHOT/daily.$idx ]
then
$MV $SNAPSHOT/daily.$idx $SNAPSHOT/daily.`expr $idx + 1`
fi
done
Cheers,
--
Cameron Simpson, DoD#743 [EMAIL PROTECTED] http://www.zip.com.au/~cs/
... common sense can be the first victim of a genuine and often ardent desire
to improve the way things are done. Unfortunately, once common sense is
missing there is no limit to the damage that can unwittingly be done.
- Bjarne Stroustrup
--
redhat-list mailing list
unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe
https://listman.redhat.com/mailman/listinfo/redhat-list
