grep from bzipped file.

visitnag · 05-17-2009, 09:44 PM

Hi

Is there any command to grep from a bzipped file? (like zgrep from gzipped file)

Disillusionist · 05-18-2009, 12:31 AM

Have you tried bzgrep?

JZL240I-U · 05-18-2009, 08:24 AM

You can always pipe it over to grep, i.e. "un-bzip <file> | grep <pattern>". Sorry, forgot the un-bzip command, Konqueror does that automatically

.

Disillusionist · 05-18-2009, 02:18 PM

Quote:

Originally Posted by JZL240I-U

You can always pipe it over to grep, i.e. "un-bzip <file> | grep <pattern>". Sorry, forgot the un-bzip command, Konqueror does that automatically

.

To unzip you use the bunzip2 command, however you cannot pass that to grep as shown in your example. Additionally, the bunzip2 command would leave the file uncompressed.

bzgrep is the best option:

Code:

bzgrep "pattern" file

Alternatively use bzcat and pass the output to grep:

Code:

bzcat file|grep pattern

JZL240I-U · 05-19-2009, 01:10 AM

Quote:

Originally Posted by Disillusionist

To unzip you use the bunzip2 command, however you cannot pass that to grep as shown in your example...

Ooops, why can't one pass the output of bunzip2 to grep? Normally when you don't specify an output file one should be able to catch the output via a pipe

<Edith says>: Okay, okay, you are right and I read the man page

. bzip2 creates automatically outputfiles with an bz2 extension and vice versa.