cat -n FILE | grep -C3 "^[[:blank:]]\{1,5\}NUMBER[[:blank:]]"

display portion of a file

This is useful for displaying a portion of a FILE that contains an error at line NUMBER

By: lv4tech
2009-05-17 18:19:55

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does not work if you are looking for a line >99 as the line will start with only 3 spaces. Grep options -A and -U can be summarized with -C (context). [[:blank:]] = \s cat -n FILE | grep -C3 "^\s*NUMBER"
tomdesinto · 470 weeks and 2 days ago
Hmm... My man page says -U means treat files as binary. -B gives context lines before the match. Alternatively just replace -A3 -B3 with -C3 Next, you whitespace will only match line numbers from 10-99. You need ^[[:blank:]]\{1,5\} to match the first 9 lines, and lines 100+. Finally, 1 will match lots of lines, so you need some more after the number to prevent it. cat -n FILE | grep -C3 "^[[:blank:]]\{1,5\}NUMBER[[:blank:]]"
flatcap · 470 weeks and 2 days ago
thanks faltcap I've changed it :)
lv4tech · 470 weeks and 2 days ago
What about something like: sed -n '5,10 p' FILE
dfego · 470 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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