UNIX for Dummies Questions & Answers

i am having 4 process,have to run parallel and not after one by one.
sample1.sh
sample2.sh
sample3.sh
sample4.sh

Thanks in advance.

i

Try

Code:

sample1.sh &
sample2.sh &
sample3.sh &
sample4.sh &
wait

I hope that this helps
Robin
Liverpool/Blackburn
UK

do i have to write this in file or it can be run directly.
As i have to put output of each script in to single file
and what is the exact role of "wait" command as mentioned above

This could be either keyed on the command line or filed and run as a script. The wait will hold up further processing until all background tasks have completed.

Would you be wanting all the output into a single file from this run? If so, then save these in a file with a few adjustments:-

Code:

> output.file                  # Clear the output file first
sample1.sh >> output.file &    # Run sample1 and append output
sample2.sh >> output.file &    # Run sample1 and append output
sample3.sh >> output.file &    # Run sample1 and append output
sample4.sh >> output.file &    # Run sample1 and append output
wait

Be careful that you don't have any other background processes running for your session as you will wait for those too. of course, there is no way to know what order thse scripts will write their output, so you might have to consider that.



Robin
Liverpool/Blackburn
UK

i have tried this one

Code:

sample1.sh &
sample2.sh &
sample3.sh &

log_1 > new.txt
log_2 >> new.txt
log_3 >> new.txt 

but the second part is not working after the first process (3 scripts are finished)

plz suggest something

I have no idea what you're even trying to do there. What would you expect that to be doing?

RUN ALL THE FOUR PROCESS AFTER COMPLETING THAT COMBINE THE OUTPUT OF ALL THE FOUR SCRIPT INTO ONE FILE.