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Editorial Team
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Asked: 2026-05-31T13:31:48+00:00

I have a file and want to replace a pattern with another string. #PBS

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I have a file and want to replace a pattern with another string.

#PBS -N bench1-M1-plt2-size15
#PBS -o /home/results/bench1-M1-plt2-size15.out
./run -d ./results/ --config=bench1-M1-plt2-size15.conf \ 
--results=bench1-M1-plt2-size15.res config/myConfig.txt -F 2000000

I use this command

sed 's/M1-[^-]*-[^-]/M1-plt32-size10/g' filename

However the output file looks like this:

#PBS -N M1-plt32-size100
#PBS -o /home/mahmood/gem5/results/M1-plt32-size100.out
./run -d ./results/ --config=bench1-M1-plt32-size100.conf \
--results=bench1-M1-plt32-size100.res config/myConfig.txt -F 2000000

Please note an extra ‘0’ character after “size10”. As you can see, in the SED command, size is set to 10, however the output file is “size100”

What is the problem and how can I fix that?

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1 Answer

  1. Editorial Team

    Your regex is not correct. You have [^-] which will match only 1 non-hyphen character. I believe this is what you intended:

    sed 's/M1-[^-]*-[^\.]*/M1-plt32-size10/' filename

    OUTPUT:

    #PBS -N bench1-M1-plt32-size10
#PBS -o /home/results/bench1-M1-plt32-size10.out
./run -d ./results/ --config=bench1-M1-plt32-size10.conf \ 
--results=bench1-M1-plt32-size10.res config/myConfig.txt -F 2000000
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