how to make a bash script that can be executed by people simultaneously?

Shell Programming and Scripting
1

dear friends,

i want to make a bash script that can be executed by many people simultaneously. do you have any idea to make it?
there will be many dependent-variables(which is input from people) in the scripts.
i am thinking about a random temporary file that created by the bash script each time someone executed it(the bash script), so when 8 people executing the bash script there will be 8 different temporary files.
i just don't know where to start... :frowning:

please help me :slight_smile:

thanks alot guys

2

You don't need to use temporary files - just store the values in variables inside the script and process them accordingly. Each different person running the script will be executing a seperate instance of the script so the variables only have scope within that instance.

If you want to use temporary files and need unique filenames for each script invocation, use $$ when you create the file, e.g.

TMPFILE="tmpfile_`date +%d%m%y`.$$"
echo "some value" >> ${TMPFILE}

$$ is the current processes PID and will be unique for each invocation.

Cheers
ZB

3

Wouldnt it better off using $USER instead of $$. I have had an instance where $$ was being used. And no matter how rare it could be, $$ did overlap once.

Vino

4

Even better would be

filename.`date +%d%m%y`.$USER.$$

At least that way if the user spawned two copies of the script (for whatever reason) the files wouldn't interfere with one another.

Cheers
ZB

5

they work well guys,

thanks alot,

this helps me so much :slight_smile: