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Old 11-22-2003, 02:02 PM   #1
soulsniper
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Date in a BASH script...


Not sure if this is in the right place, but i'll go ahead....

I run a Red Hat Linux server from home and want to be able to keep weekly backups. I have an extra hard disk used for backups...

I know the command that I need to use to backup the system, the problem is I want to be able to set this up in a cron job so that it is automatically done every week. The other problem I have is that I want the filename of the backup to have the date in...

My conclusion is that I need to write a small bash script that gets the date and then runs the command to backup the system. For reference, the command I was going to use is:

sh -c RSH="/usr/bin/ssh" dump -0 -f '/backup/backup-DD-MM-YY' -u -j9 '/'

I need to get the bash script to run that command except change the DD-MM-YY to the relevant date.

I'm clueless about bash scripts so I haven't a clue.

TIA for any help recieved
 
Old 11-22-2003, 02:13 PM   #2
teval
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Replace DD-MM-YY with:

`date +%e-%m-%y`

Including the `s
They execute what's inside and pass it's output

info date
For the maual for date
 
Old 11-22-2003, 02:18 PM   #3
soulsniper
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Thanks for the speedy reply.

However, it doesn't work. This is my script...

PHP Code:
#/bin/bash
dump --'/backup/backup-`date +%e-%m-%y`' --j9 '/' 
The script runs and starts the backup, however, the file name ends up as

backup-`date +%e-%m-%y'

Odd...


Last edited by soulsniper; 11-22-2003 at 02:26 PM.
 
Old 11-22-2003, 03:48 PM   #4
teval
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The 's stop it from executing properly.
You can do this instead

date +%e-%m-%y|xargs -ireplacethis dump -0 -f '/backup/backup-replacethis' -u -j9 '/'

That should work
 
Old 11-22-2003, 03:53 PM   #5
soulsniper
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Thanks, that works now.
 
Old 11-22-2003, 03:54 PM   #6
teval
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No problemo
Read the info xargs page and play around with it. It's one of the most powerful programs in my opinion.
 
Old 11-22-2003, 06:05 PM   #7
DirtDart
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I always prefer to set the date up as a variable, such as:


#!/bin/bash
DATE=`date +%e-%m-%y`
dump -0 -f '/backup/backup-$DATE' -u -j9 '/'
 
1 members found this post helpful.
Old 11-22-2003, 06:08 PM   #8
soulsniper
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Unfortunately I setup the cronjob to run the bash script and I instantly got an email from the Cron Daemon saying that it had failed. So instead I put the entire command "date +%e-%m-%y|xargs -ireplacethis dump -0 -f '/backup/backup-replacethis' -u -j9 '/'" as the command Cron must run.

All works fine now
 
  


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