RE: basic bash help

From: Fowler, Kenneth R <Kenneth.R.Fowler_at_pfizer.com>
Date: Fri, 27 May 2011 15:32:02 -0400
Message-ID: <BBB354D922057B4BA2D84BA6801DB92306B6ED2C_at_ndhamrexm66.amer.pfizer.com>

I tend to use the following code fragment in many of my scripts...    

$ cat test.sh
#!/bin/sh
case $0 in
/*)

    FILE_NAME=$0
    ;;
*)

    FILE_NAME=`printf "%s/%s\n" $PWD $0 | sed -e s'!/\./!/!'g`     ;;
esac
#
echo $FILE_NAME  

It will give desired results no matter how it is called, full pathname or relative etc...    

$ pwd
/orabackup/ocdba/Ken/stuff

$ test.sh
/orabackup/ocdba/Ken/stuff/test.sh

$ ./test.sh
/orabackup/ocdba/Ken/stuff/test.sh

$ /orabackup/ocdba/Ken/stuff/test.sh
/orabackup/ocdba/Ken/stuff/test.sh

$ cd ..
$ stuff/test.sh
/orabackup/ocdba/Ken/stuff/test.sh

$ ./stuff/test.sh
/orabackup/ocdba/Ken/stuff/test.sh

$ /orabackup/ocdba/Ken/stuff/test.sh
/orabackup/ocdba/Ken/stuff/test.sh
 

Regards,
Ken.

---

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Stephens, Chris Sent: Friday, May 27, 2011 2:42 PM
To: 'oracle-l_at_freelists.org' (oracle-l_at_freelists.org) Subject: basic bash help

I'm writing a script to allow the sysadmin's to kill any active sessions for a particular database user.  

If the script is called as root, I re-invoke it as oracle. However, 'dirname' doesn't seem to be working as expect and I have no idea why or how to get around it. A little bit of googl'ing didn't help either so I turn to old faithful. J  

#!/bin/sh  

export ORAENV_ASK=NO

export ORACLE_SID=xxxxxxx  

export SCRIPT=`basename $0`

export SCRIPT_DIR=`dirname $0`  

echo "${SCRIPT_DIR} is the script dir."

# Re-invoke this script as oracle if invoked as root

CUSER=`id |cut -d"(" -f2 | cut -d ")" -f1`

if [ "$CUSER" = "root" ]

then

        su - oracle -c "${SCRIPT_DIR}/${SCRIPT}"

        exit $?

fi  

<rest of script>  

The script output is:  

  ". is the script dir."  

The script is located in /home/oracle/scripts/sql/topsecret  

Anybody know what the deal is?  

I'm guessing it has something to do with sub-shells or something but I don't know how to work around it. I guess I can always hardcode the path but I would prefer not to.  

Thanks for any help!  

chris  

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Received on Fri May 27 2011 - 14:32:02 CDT