Written by Guillermo Garron .
Date: 2007-05-04 10:46:30 -0400
Sometimes you may want to take a look at a file, only to the first lines of it, this is specially useful when you are watching at CSV files that you may be using to work with MySQL or PosgreSQL databases, in this cases what we need is to look at the head of the file to see its structure, but not all the file. To do this we use the head command.
Displays the beginning of a file (as many lines as you want).
head [options] [file]
- -c, –bytes=[-]N print the first N bytes of each file; with the leading ‘-’, print all but the last N bytes of each file
- -n, –lines=[-]N print the first N lines instead of the first 10; with the leading ‘-’, print all but the last N lines of each file
- -q, –quiet, –silent never print headers giving file names
- -v, –verbose always print headers giving file names
this is a really useful command, and as you can see its use is really easy.
head -3 minicom.log
20070221 17:35:11 Hangup (0:00:00) 20070221 17:52:16 Gone offline (0:00:06) 20070221 17:57:07 Gone offline (0:00:07)
head -6 minicom.log
20070221 17:35:11 Hangup (0:00:00) 20070221 17:52:16 Gone offline (0:00:06) 20070221 17:57:07 Gone offline (0:00:07) 20070221 18:44:53 Gone offline (0:00:06) 20070221 18:46:35 Gone offline (0:00:06) 20070221 21:17:20 Hangup (0:00:00)
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My name is Guillermo Garron. I am telecommunications engineer from Bolivia
I like technology a lot, and this site is mainly dedicated to that
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