I want to delete one line on two with linux such that
A
B
C
D
E
becomes
A
D
E
how can I make it work?
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1
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Do you want to delete the lines 2 and 3, or every 2nd and 3rd line out of five? – Jan Sep 30 '14 at 08:47
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I want to delete all "pair" lines, every first line out of two. – heydude1 Sep 30 '14 at 08:49
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1Then it should be A/C/E instead of A/D/E – fedorqui Sep 30 '14 at 09:09
1 Answers
3
It seems to me you want to get every odd line. For this, you can use many tools:
awk 'NR%2' file
this takes into account the number of record (NR, that is, number of line in this case) and evaluates if it is multiple of 2 or not. If it is, the condition NR%2 is false, so that lines are not printed; otherwise, they are. Note the default behaviour of awk is {print $0}, so it can be omitted: 1 is the same as {print $0}.
sed '0~2d' file
Just delete every line that is multiple of 2. You can also inhibit the printing with -n and explicitly print those lines not being multiple of 2:
sed -n '1~2p' file
fedorqui
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