Add -n switch to grep command

[jsteyn]

Without the -n switch on grep to include line numbers on the result, the cut -d : -f 2 of the script serves no purpose

[github-actions]

Thank you!

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🔍 Inspect the changes: https://github.com/swcarpentry/shell-novice/compare/md-outputs..md-outputs-PR-1392

The following changes were observed in the rendered markdown documents:

 07-find.md | 2 +-
 md5sum.txt | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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⏱️ Updated at 2023-05-16 11:17:53 +0000

[bkmgit]

Thanks for the pull request. It does not seem to match the output shown in https://github.com/swcarpentry/shell-novice/blob/main/episodes/07-find.md?plain=1#L321-L324 the -n gives line numbers in which the text string is found. Maybe something else is needed? If so, one would also need to update https://github.com/swcarpentry/shell-novice/blob/main/episodes/07-find.md?plain=1#L350-L352