Need some help with grep Post: 302516655

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Homework and Emergencies Homework & Coursework Questions Need some help with grep Post 302516655 by Bob07 on Sunday 24th of April 2011 04:23:58 PM

04-24-2011

Registered User

Quote:

Originally Posted by Corona688

Why's it in backticks? What filename is * supposed to be? Otherwise it looks ok.

The files thing has me confused: I had thought that grep would just look within the /etc directory for matches but apparently thats not how it works.(?) So I attempted to add a few files in my /home/user directory and added a few lines within the files using vi but when I run the grep command from the prompt it returns nothing. I'm using

grep '^efg' /home/useraccount - where efg is some random text I typed up for the beginning line.

$ means 'end of string', so you've got it on the wrong side of ab. Also, why do you have it in backticks? And what filename is /etc supposed to be? Needs to be a file, not a dir. Otherwise, looks OK.

Backticks will be removed. Wrong side? Okay, makes sense. And again, not understanding how it searches through files apparently. Wrote what I did above.

Doesn't work that way. [BOB] looks for the letter B, or the letter O, or the letter B.

Since the first letter's always the same, you could have grep 'B[secondletters][thirdletters]' where secondletters and thirdletters are the allowable letters for those spots.

Also, you've got it in backticks again.

Okay, will fix this.

[] doesn't work like that.

Code:

grep '[0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9]'

Also, what filename is * supposed to be?

Ah, makes sense.

Are you allowed to use egrep? that's because you keep putting them in backticks. So it runs the grep, then tries to run its output as a command.

Thanks for the input. I'll work on correcting this and get back to you.

*Edit* I fail at quoting I guess . . .

Last edited by Bob07; 04-24-2011 at 05:39 PM.. Reason: Quoting

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bzgrep

BZGREP(1)						      General Commands Manual							 BZGREP(1)

NAME

       bzgrep, bzfgrep, bzegrep - search possibly bzip2 compressed files for a regular expression

SYNOPSIS

       bzgrep [ grep_options ] [ -e ] pattern filename...
       bzegrep [ egrep_options ] [ -e ] pattern filename...
       bzfgrep [ fgrep_options ] [ -e ] pattern filename...

DESCRIPTION

       Bzgrep  is  used to invoke the grep on bzip2-compressed files. All options specified are passed directly to grep.  If no file is specified,
       then the standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and  fed	to
       grep.

       If  bzgrep  is  invoked as bzegrep or bzfgrep then egrep or fgrep is used instead of grep.  If the GREP environment variable is set, bzgrep
       uses it as the grep program to be invoked. For example:

	   for sh:  GREP=fgrep	bzgrep string files
	   for csh: (setenv GREP fgrep; bzgrep string files)

AUTHOR

       Charles Levert (charles@comm.polymtl.ca). Adapted to bzip2 by Philippe Troin <phil@fifi.org> for Debian GNU/Linux.

SEE ALSO

       grep(1), egrep(1), fgrep(1), bzdiff(1), bzmore(1), bzless(1), bzip2(1)

																	 BZGREP(1)