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Simple if script

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# 1  
Old 04-08-2014
Simple if script
Hi,

new to unix and scripting, and i'm trying to set up a simple "if" script to create a seperate flag file dependant on success.
So far i have the following ($5 is a variable passed to the script from the backup job)
Code:
if [ '$5' == '0' ]
  then
    touch /u03/backups/backup_ended.flag
else
    touch /u03/backups/backup_failed.flag
fi

I dont have any troubleshooting i can share, as the script can only be started at the end of the backup..

thanks

Rich


Moderator's Comments:
Mod Comment Please use code tags next time for your code and data. Thanks
Last edited by vbe; 04-08-2014 at 10:43 AM.. Reason: code tags
# 2  
Old 04-08-2014
You're using the wrong quotes for this. And, a non-portable comparison. Try:
Code:
if [ "$5" = '0' ]
  then
    touch /u03/backups/backup_ended.flag
else
    touch /u03/backups/backup_failed.flag
fi

Last edited by Don Cragun; 04-08-2014 at 10:45 AM.. Reason: Add another fix.
# 3  
Old 04-08-2014
Welcome...
Remember to always give the shell you are using...( Yes syntax may vary...)
What I dont get is $5... Is it the backup job that calls this script?
# 4  
Old 04-08-2014
its a netbackup bpend_notify script if that helps any?

Code:
at the start it says  
#! /bin/sh

Thanks for the suggestion Don, it didnt work though. I know that the bpend script is being called at the end of the backup as just having a simple "touch filename" create the file.

The variables i'm trying to use are listed as
Code:
 # This script is called by NetBackup when bpbkar is finished doing a
  # backup on the client. It is also called after backing up the files
  # for a user directed archive, but before the files are deleted.
  #
  # This script:
  #       receives 5 parameters: CLIENTNAME POLICYNAME SCHEDNAME SCHEDTYPE STATUS
  #       must be executable by the root user
  #       should exit with 0 upon successful completion

Last edited by Scott; 04-08-2014 at 11:10 AM.. Reason: Code tags
# 5  
Old 04-08-2014
It's double equal to "=="

Code:
if [ "$5" == '0' ]
  then
    touch /u03/backups/backup_ended.flag
else
    touch /u03/backups/backup_failed.flag
fi

or, you can also try this
Code:
if [[ "$5" -eq 0 ]]
  then
    touch /u03/backups/backup_ended.flag
else
    touch /u03/backups/backup_failed.flag
fi

# 6  
Old 04-08-2014
Quote:
Originally Posted by richs24
its a netbackup bpend_notify script if that helps any?

Code:
at the start it says  
#! /bin/sh

Thanks for the suggestion Don, it didnt work though. I know that the bpend script is being called at the end of the backup as just having a simple "touch filename" create the file.

The variables i'm trying to use are listed as
Code:
 # This script is called by NetBackup when bpbkar is finished doing a
  # backup on the client. It is also called after backing up the files
  # for a user directed archive, but before the files are deleted.
  #
  # This script:
  #       receives 5 parameters: CLIENTNAME POLICYNAME SCHEDNAME SCHEDTYPE STATUS
  #       must be executable by the root user
  #       should exit with 0 upon successful completion


Probably this could be the reason you are receiving error message, Don's approach is right, whenever you are asking questions please mention OS, and shell you are using.

Code:
$ cat f
a=0
[ "$a" == '0' ] && echo 'ok'

$ sh f
f: 5: [: 0: unexpected operator

$ bash f
ok

$ cat f1
a=0
# with or without single quote works..
[ "$a" -eq '0' ] && echo 'ok'

$ sh f1
ok

---------- Post updated at 09:03 PM ---------- Previous update was at 08:50 PM ----------

@SriniShoo

Quote:
Originally Posted by SriniShoo
It's double equal to "=="
...
...
if[ "$a" = '0' ]

OR

if[ "$a" == '0' ]


It depends on shell being used, for example

Code:
$ cat f
a=a
[ "$a" = 'a' ] && echo 'ok'
[ "$a" == 'a' ] && echo 'ok'

$ sh f
ok
f: 5: [: a: unexpected operator

$ bash f
ok
ok

# 7  
Old 04-08-2014
if i do an

echo $SHELL

it comes back with

/sbin/sh

if that changes anything?
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