sed : Need to remove all lines except first or last line that matches a string
Question
I have a text file with the following content
aa : 01
bb : 01
cc : 01
aa : 02
dd : 01
bb : 02
ee : 01
aa : 03
ff : 01
bb : 03
I need to keep first occurrence of line that has string "aa" in it and last occurrence of line that has string "bb" in it.
Please help. Output should be
aa : 01
cc : 01
dd : 01
ee : 01
ff : 01
bb : 03
1 answers
solution1
3 ACCPTED 2013-12-24 09:49:37
You can use this awk:
awk '!c && /^aa/{c=1;print;next} /^bb/{l=$0;next} !/^aa/ {print} END{print l}' file
aa : 01
cc : 01
dd : 01
ee : 01
ff : 01
bb : 03
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