I'm trying do make a script capable of verifying if a given script is running at the moment in the environment, and if does, forbid it to execute.
So, I've coded this so far:
I was trying to encapsulate the ps and its pipes into a variable, then to use it like
while read $COMMAND V1 V2 (the second variable exists only for testing purposes)
or while read ....
do
done < $COMMAND
But I got into a endless loop.
Also, I got into the first if and the variable V1 printed out was displaying NULL...
Does anyone have any suggestion, tip or corrections to this script ?
Thanks in advance,
435 Gavea - bRaZiL - thE hElL iS herE !!!
I had created a function awhile back to create a lock file based upon the process number of the shell. The function takes two arguments, one for the name of the log file and the other is $$. The script creates a lock file in the /tmp directory. This file holds the process ID of the shell that created it. If you attempt to execute the script while another instance was running, this function will prevent the second instance from running. Works well for me. Feel free to use if you so choose. added code tags for readability --oombera
Originally posted by 435 Gavea Using set doesn't make the code more readable ?
Using set makes the code wrong.
var="string"
will set $var to the value "string". On the other hand,
set var=string
does not affect a variable called var. Instead it clobbers the arguments and sets $1 to the value "var=string". Try it,
set var="string"
echo $var
echo $1
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