topic Re: renaming / as /root.bak while taking vxdump backup in Operating System - HP-UX

renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 08:46:54 GMT

Hi, I have written a script which backs up all the file system is list as .bak with vxdump
for ex:-

/var --> /var.bak
/stand --> /stand.bak
and so on

Below is my script:-
===>
set -vx
TAPE=/backup/networker_db_backup/os_app
HOST=`hostname`
FILESYSTEMS=`cat /test/filesystems_to_backup_V3`
echo "STARTING BACKUP OF $HOST `date`"
cd /
for i in $FILESYSTEMS
do
echo "STARTING BACKUP OF $i `date`"
/usr/sbin/vxdump -0 -u -b 128 -B 200g -f ${TAPE}${i}.bak $i 2>&1
if [ $? -gt 0 ] ; then
echo "BACKUP FAILED FOR $i `date`"
exit 1
else
echo "BACKUP COMPLETED FOR $i `date`"
fi
done
echo "END OF BACKUP SCRIPT"
====>

The problem is it backs / as:
/ --> .bak
and want it to be backed as below:
/ --> /root.bak

if I repalce the / with root in the file list it won't back the / filesytem. Kindly assist with your inputs.

Thanking you in advance

Re: renaming / as /root.bak while taking vxdump backup

Dennis Handly — Tue, 09 Dec 2008 08:56:35 GMT

How are you getting it to do /var.bak and /stand.bak?

Re: renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 08:58:29 GMT

/usr/sbin/vxdump -0 -u -b 128 -B 200g -f ${TAPE}${i}.bak $i 2>&1

${i}.bak ---> this part does that.

Re: renaming / as /root.bak while taking vxdump backup

Peter Nikitka — Tue, 09 Dec 2008 10:12:10 GMT

Hi,

try this:
...
echo "STARTING BACKUP OF $i `date`"
j=${i#/}
/usr/sbin/vxdump -0 -u -b 128 -B 200g -f ${TAPE} /${j:-root}}.bak $i 2>&1
if [ $? -gt 0 ] ; then
...

mfG Peter

Re: renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 11:03:02 GMT

Hi Peter,

I pressume this will only back / area. But what I intend to do is back up all the files in $FILESYSTEMS in for loop.
Currently it is doing so for all the filesystem however it is backing the / as .bak which I need to do as root.bak along with all the other filesystems.

Hope you understood.

Re: renaming / as /root.bak while taking vxdump backup

Dennis Handly — Tue, 09 Dec 2008 11:45:54 GMT

>I presume this will only back / area.

Peter's logic will remove the "/" from the name, then if there is nothing left, it will insert "root".

Re: renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 12:57:43 GMT

To be frank I have not understood the logic. If this logic is backing all the filesystem along with / renaming then I have found GOD.

If possible kindly explain the logic.

Thanks.

Re: renaming / as /root.bak while taking vxdump backup

James R. Ferguson — Tue, 09 Dec 2008 13:28:52 GMT

hi:

> To be frank I have not understood the logic.

To see what Peter has done (to solve your problem), run this test script:

# cat ./seehow
#!/usr/bin/sh
for i in / /root /tmp /var
do
j=${i#/}
echo /usr/sbin/vxdump -0 -u -b 128 -B 200g -f ${TAPE} /${j:-root}.bak $i
done

The statement:

j=${i#/}

...examines the 'i' parameter and if it begins with the '/' character, then that character is dropped and the remainder of the character string is assigned to 'j'. Otherwise, the value of 'i' is simply assigned to 'j'.

The experssion:

/${j:-root}.bak

...is of the form:

${parameter:-word}

...which says, if the parameter is set and is nonnull, substitute its value; otherwise, substitute word. Hence, if 'j' is set and not null, use the value of 'j'; otherwise, substitute the string "root".

These techniques are described in the 'sh-posix' manpages under "Parameter Substitution":

http://docs.hp.com/en/B3921-60631/sh-posix.1.html

Regards!

...JRF...

Re: renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 14:05:23 GMT

Thank you all for your reply have got the required output.

Special thanks to Peter and James.

Re: renaming / as /root.bak while taking vxdump backup

kpatel786 — Tue, 09 Dec 2008 14:05:51 GMT

Re: renaming / as /root.bak while taking vxdump backup

Peter Nikitka — Wed, 10 Dec 2008 11:22:04 GMT

Hi,

thanks to Dennis + James for the excellent explanation of the construct I used.
I really try not to leave questions to my work uncommented, but had to leave unexpectedly.

mfG Peter