Peteris Krumins comment on Famous Awk One-Liners Explained, Part III: Selective Printing and Deleting of Certain Lines

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Perl one-liners explained

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Peteris Krumins pkrumins Permalink

February 12, 2009, 01:02

Yogesh, I have three answers for you:

awk 'f;{f=/foo/}'

awk 'c&&!--c;/foo/{c=1}'

awk '/foo/{_[NR+1]}NR in _'

And my friends from #awk channel suggested a bunch of variations:

a) Print all records from some pattern:

     awk '/pattern/{f=1}f' file

b) Print all records after some pattern:

     awk 'f;/pattern/{f=1}' file

c) Print the Nth record after some pattern:

     awk 'c&&!--c;/pattern/{c=N}' file

d) Print every record except the Nth record after some pattern:

     awk 'c&&!--c{next}/pattern/{c=N}' file

e) Print the N records after some pattern:

     awk 'c&&c--;/pattern/{c=N}' file

f) Print every record except the N records after some pattern:

     awk 'c&&c--{next}/pattern/{c=N}' file

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Famous Awk One-Liners Explained, Part III: Selective Printing and Deleting of Certain Lines