Help with grep (reWriting it in another way.) Post: 302380678

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Top Forums Shell Programming and Scripting Help with grep (reWriting it in another way.) Post 302380678 by kenshin88 on Wednesday 16th of December 2009 02:31:46 AM

12-16-2009

Registered User

Help with grep (reWriting it in another way.)

Hello everyone!! Nice do be apart of your forum. I am not very good at unix and thats why i need your help i have this project where i have to simulate a grep command without using grep thought. I have to simulate

Code:

grep [-n] <parameters> <file>
grep [-v] <parameters> <file>
grep [-y] <parameters> <file>
grep [-i] <parameters> <file>
grep [-w] <parameters> <file>
grep [-f file] <parameters> <file>

as a file i am using /etc/passwd

Moreover they will have to be able to use paremeters such as

re+
re?
re1|re2

where you find in an egrep.
i know the first 2 can be done with sed but i am not sure if the re+,re? and re1|re2 parameters work...

Please if someone clould help i would be gratefull.

Thanks a lot.

*ps forgot to mention the language we use in script writing is awk.

Last edited by Franklin52; 12-16-2009 at 04:25 AM.. Reason: Please use code tags!

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zegrep

ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME

     zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files

SYNOPSIS

     zgrep [grep-flags] [--] pattern [files ...]

     zegrep [grep-flags] [--] pattern [file ...]

     zfgrep [grep-flags] [--] pattern [file ...]

DESCRIPTION

     zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1).

     The grep-flags and pattern arguments are passed on to grep(1).  If an -e flag is found in the grep-flags, zgrep will not look for a pattern
     argument.

     zegrep calls egrep(1), while zfgrep calls fgrep(1).

EXIT STATUS

     In case of missing arguments or missing pattern, 1 will be returned, otherwise 0.

SEE ALSO

     egrep(1), fgrep(1), grep(1), gzip(1), zcat(1)

AUTHORS

     Thomas Klausner <wiz@NetBSD.org>

BSD
								 December 28, 2003							       BSD