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extract a certain number of lines from a file and dump them to another file

Terminal - extract a certain number of lines from a file and dump them to another file
grep '' -m X file1 > file2
2009-03-22 04:34:43
User: sardanapalos
Functions: grep
extract a certain number of lines from a file and dump them to another file

It extracts X number of lines from file1 and dumps them to file2.Using grep with the empty string '' extracts the complete lines (i.e. no filtering takes place) and the -m flag indicates how many lines to extract out from the given file. Then using the redirect > operator we send the extracted lines to a new file.


There are 5 alternatives - vote for the best!

Terminal - Alternatives

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What others think

You could also use the head or tail command

head -X file1 > file2 tail -X file1 > file2

where X is the number of lines you want to extract from the top/bottom of file1.

Comment by gar 371 weeks ago

awk ' NR = min { print } ' file1 > file2

Comment by maht 371 weeks ago

where min and max (inclusive) are the line numbers you're interested in

Comment by maht 371 weeks ago

ack my

Comment by maht 371 weeks ago

ack my < and > got swallowed (twice !)

awk ' NR >= min && NR <= max { print } ' file1 > file2

fingers crossed

Comment by maht 371 weeks ago

hmm this would be better because then it won't keep processing lines you don't want

NR < min { next } NR > max { exit } { print }

Comment by maht 371 weeks ago

Your point of view

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