Trimming filles

[Fabian Briseño]

Hi guys.

Is there any was ti trim a file let's say the file is 1MB and i want to trimit to 500kb, I know that this could be done via SAM, but is there a way to do it via command line.

[Jaime Bolanos Rojas. · Accepted solution]

Fabian,

This thread should help you out,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=1033864

Regards,

Jaime.

[Pete Randall]

tail -500 file > file2
mv file2 file


Pete

[Peter Godron]

Fabian,
As a one off:
either
use vi or tail -xxxxx > tempfile
or
split the file into chunks the size you want then cp the final split to the original file.
see man split

For the more elegant solution I'd stick to SAM.

[James R. Ferguson]

Hi Fabian:

If we assume that you are talking about ASCII files, 'sed' or 'perl' are easily leveraged. For instance, consider a 1000-line file where you want to preserve only the last 500 lines:

# sed -ne '501,$p' file

With Perl:

# perl -ni -e 'print if $. > 501'

The perl script will update your file "in-place' leaving a trimmed copy.

Regards!

...JRF...

[Fabian Briseño]

thanks guys you were of great help.