dotlockfile

[Michael Hipp]

Jay Nugent wrote:
> Greetings,
> 
> On Tue, 24 Jul 2007, Michael Hipp wrote:
> 
>> Does anyone have a bash script that does essentially the same thing as 
>> the 'dotlockfile' utility?
>>
>> I have a system without dotlockfile but I need that functionality to 
>> keep a script from clobbering itself.
> 
>    I just ran into this problem earlier today.  So I'll be implementing 
> this lockfile code into my scripts tonight.
> 
> 
> #
> #==================================================================
> # Test to see if we have a LOCK file (i.e. a copy is still running)
> #
> LCKFYLE="/home/wwnet/LCK-wwnet-dialusage"
> #
> if [ -f $LCKFYLE ]; then
>         /bin/mail -s "$LCKFYLE exists" jjn at nuge.com
>         exit 0
> else
>         touch $LCKFYLE
> #
> #==================================================================
> # We wrap the rest of the code from here on...
> #
> 
>    [ place the rest of your script in here ]
> 
> #
> #==================================================================
> #
> # ... the end of the LCKFYLE test wrapper
> #
> rm $LCKFYLE
> #
> fi
> #
> #----------
> #
> # - end -
> #

Thanks. Unfortunately this doesn't handle the "stale lock file" syndrome 
(where the script crashes in the middle part and the lock file stays 
around even tho the job is dead).

Michael