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I am trying to clean a list containing packages. I wish to remove the package revisions, leaving the package names only.

I see every package has naming convention like this: package-name-majorver-minorver , etc: openssl-1.0.1e-57.0.5.el6 . I want openssl only, not -1.0.1e-57.0.5.el6

So far I have this sed 's/^.*-//', but this doesn't work obviously.

  • watch out for package names with dashes! If you're gathering the list with RPM, consider using the --queryformat to get the %NAME separately. – Jeff Schaller Mar 13 at 11:05
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If the package name always has two version number parts appended, separated by hyphens, and if the version parts never contain a hyphen, you can use this command

sed 's/-[^-]*-[^-]*$//'

This will remove two hyphens, each followed by 0 or more non-hyphen characters, at the end of the line ($). It would also change e.g. foo-bar-baz-- to foo-bar-baz.

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If the package name doesn't contain -, this should work:

sed -r 's/([^-]+).*/\1/' 
  • unfortunately, it does, and the number of - 's are inconsistent too, eg: tmux and python-pip, the only consistent ones are major ver and minor ver appended to back separated by - – user121392 Mar 13 at 10:10
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Well I know it's not the best solution, but I found this https://stackoverflow.com/a/51153277/5227747, so the solution was

cat file | sed 's/ // ; s/-/\t/' | rev | cut -f 3- | rev | sed 's/\t/-/'

it removes the last two '-'-separated columns without fuss, if anyone knows how to do it better I would love to know.

  • Unneccessary cat – Weijun Zhou Mar 13 at 10:57
  • I have to read from a file. I will check sed to improve the command – user121392 Mar 13 at 11:49
  • You should almost always do sed ... file instead of cat file | sed ... – Weijun Zhou Mar 13 at 22:19

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