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Thanks for the explanation.

@kristinu O/P
Is this similar to one of your other threads?
https://www.unix.com/unix-dummies-questions-answers/174224-using-sort.html

In the unix world I would not expect "grep filename" to outperform "cat filename| grep" on large files unless there was some bottleneck in the system.
The relevant unix commands are optimised for...

Apologies (insult removed from post) because I can see that you are an experienced poster. There are many who jump on the "cat" command because they have seen other uninformed posts. They do not take...

Please do not ever mention UUOC in my presence. That is unless you can write software to get data onto a pipeline faster than "cat".

Howabout using the unix "cut" command.

cat filename.txt | cut -f1-4,6- -d-

n02-z30-dsr65-terr0.50-8x6drw-csq.msf
n02-z30-dsr65-terr0.50-8x6drw-csq.msf
n02-z30-dsr65-terr0.50-8x6drw-csq.msf...