1

I am performing some operations using the grep, sed, and cut commands on a Linux machinete:

zgrep -A1 "^module" *.v.gz | sed -n -e 's/^\(module \)*\(.*(.*)\).*$/\2/p' | cut -f1 -d"("

This is being run on files with the extension .v.gz and I want the output files to have a .txt extension instead.

For example, input filename:

abcd.v.gz
efgh.v.gz
ijkl.v.gz
mnop.v.gz

output filename

abcd.txt
efgh.txt
ijkl.txt
mnop.txt

So I want to keep the same file name prefix, but change the extension. How can I do this for an arbitrary number of files?

Improve this question
1
  • Regarding ` using the grep, sed, and cut` - any time you find yourself chaining together multiple Unix commands for manipulating text there's an excellent chance you could do the same with a single awk script. Commented Nov 19, 2022 at 13:33

1 Answer 1

Reset to default
1

I use a shell loop in this type of case:

for file in *.v.gz; do zgrep -A1 "^module" "$file" | sed -n -e 's/^\(module \)*\(.*(.*)\).*$/\2/p' | cut -f1 -d"(" > $(basename "$file" .v.gz).txt; done

You may even not need the basename command if your shell has a primitive for that kind of operation.

As a complete shell script, it would look like:

#!/bin/bash

for file in *.v.gz
do
    zgrep -A1 "^module" "$file" | sed -n -e 's/^\(module \)*\(.*(.*)\).*$/\2/p' | cut -f1 -d"(" > $(basename "$file" .v.gz).txt
done
Improve this answer
3
  • @Igeorget i have no idea about shell scripting Commented Nov 17, 2022 at 4:04
  • it's giving me an error as -script_shell.sh: line 2: syntax error: unexpected end of file, Commented Nov 17, 2022 at 4:05
  • @SanthoshNayakD. Sorry I forgot the end of the loop... the "done" keyword Commented Nov 17, 2022 at 17:07

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.