Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Grouping in grep
Top Forums UNIX for Dummies Questions & Answers Grouping in grep Post 302658081 by sudon't on Monday 18th of June 2012 06:27:03 PM
Old 06-18-2012
Grouping in grep
How do you do grouping in grep? Here's how I tried it at first:
Code:
egrep 'qualit(y|ies)' /usr/share/dict/words
-bash: syntax error near unexpected token `('

I'm using GNUgrep, and I found this on their site. grep regular expression syntax

Quote:
Grouping is performed with backslashes followed by parentheses ‘\(', ‘\)'. A backslash followed by a digit acts as a back-reference and matches the same thing as the previous grouped expression indicated by that number. For example ‘\2' matches the second group expression. The order of group expressions is determined by the position of their opening parenthesis ‘\('.

The alternation operator is ‘\|'.
So I tried this:
Code:
egrep 'qualit\(y\|ies\)' /usr/share/dict/words

And got no results, although clearly these two words are in the dictionary, (yeah, I even checked). Now, I could've sworn I used parentheses in grep for grouping, and the pipe as an "or" operator. So I thought maybe it was GNUgrep that was the problem, so to speak, so I tried the old /bin/grep, but got similar results. Clearly I'm going something wrong. What obvious thing am I missing?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

egrep and grouping

i am using the c shell on solaris. directories i'm working with: ls -1d DIV* DIV_dental/ DIV_ibc/ DIV_ifc/ DIV_index/ DIV_pharm/ DIV_sectionI/ DIV_sectionI-title/ DIV_sectionI-toc/ DIV_sectionII-title/ DIV_sectionII-toc/ DIV_standing/ DIV_standing-toc/ DIV_title/ DIV_vision/ (1 Reply)
Discussion started by: effigy
1 Replies

2. UNIX for Advanced & Expert Users

Regarding the user grouping

I am new to the unix server. My question is: i have 10 users a b c d e f g h i j Among the 10 5 users are (normal) user and remainging 5 users are (qad) users How can i sepearte this one? How can i give the dlc access rights? Please provide the clear cut idea. (0 Replies)
Discussion started by: kingganesh04
0 Replies

3. UNIX for Dummies Questions & Answers

Help with data grouping

Hi all, I have a set data as shown below, and i would like to eliminate the name that no children - boy and girl. What is the appropriate command can i use(other than grep)? Please assist... My input: name sex marital status children - boy children - girl ... (3 Replies)
Discussion started by: 793589
3 Replies

4. Shell Programming and Scripting

Grouping each 2 lines

Whats a good way to group (by adding a new integer to the front of each line) pairs of lines, such that lines 1 & 2 are group 1, lines 3 & 4 are group 2, etc... ex input: A B C D etc... ex output: 1A 1B 2C 2D etc... (5 Replies)
Discussion started by: watingo
5 Replies

5. Shell Programming and Scripting

Selective grouping

I have a text file in this format. Group: AAA Notes: IP : 11.11.11.11 #User xxxxxxxxx #Password aaaaaaaaaaaaaaaa Group: AAA Notes: IP : 11.11.11.22 #User yyyyyyyyyyyyy #Password bbbbbbbbbbbbb (8 Replies)
Discussion started by: anil510
8 Replies

6. Shell Programming and Scripting

Grouping

Hi all, I am using following command: perl program.pl input.txt output.txt CUTOFF 3 > groups_3.txt containing program.pl, two files (input.txt, output.txt) and getting output in groups_3.txt: But, I wish to have 30 files corresponding to each CUTOFF ranging from 0 to 30 using the same... (1 Reply)
Discussion started by: bioinfo
1 Replies

7. Shell Programming and Scripting

UNIX grouping

Hi guys, I am a complete newbie to unix and have been tasked with creating a script to group the following data (file) by hourly slots so that I can count the transactions completed within the peak hour. I am not sure how to group data like this in unix. Can anyone please help? Here is an... (1 Reply)
Discussion started by: MrMidas
1 Replies

8. Shell Programming and Scripting

Name grouping

awk 'FNR==NR {a; next} $NF in a' genes.txt refseq_exons.txt > output.txt I can not figure out how to group the same name in $4 together. Basically, all the SKI together in separate rows and all the TGFB2. Thank you :). chr1 2160133 2161174 SKI chr1 218518675 218520389 TGFB2... (1 Reply)
Discussion started by: cmccabe
1 Replies

9. Shell Programming and Scripting

Grouping and counting

Hello, I would like to group/sort a file of records by a particular field and then count how many records belong in that grouping. For example say I have the following data: 1234|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA ABCD|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|AA EFGH|"ZZZ"|"Date"|"1"|"Y"|"ABC"|""|BB... (14 Replies)
Discussion started by: Nik44
14 Replies

10. Shell Programming and Scripting

Help with grouping and zipping

Hi can you please help with the below ? source file: Column1,Column2,Column3,Column4 abc,123,dir1/FXX/F19,1 abc,123,dir1/FXX/F20,1 abc,123,dir1/FXX/F23,2 abc,123,dir1/FXX/C25,2 abc,123,dir1/FXX/X25,2 abc,123,dir1/FXX/A23,3 abc,123,dir1/FXX/Z25,3 abc,123,dir1/FXX/Y25,4 I want to... (3 Replies)
Discussion started by: paul1234
3 Replies

LEARN ABOUT LINUX

xzegrep

XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME

       xzgrep - search compressed files for a regular expression

SYNOPSIS

       xzgrep [grep_options] [-e] pattern file...
       xzegrep ...
       xzfgrep ...
       lzgrep ...
       lzegrep ...
       lzfgrep ...

DESCRIPTION

       xzgrep  invokes	grep(1)  on  files  which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1).  All options
       specified are passed directly to grep(1).

       If no file is specified, then standard input is decompressed if necessary and fed to grep(1).  When reading from  standard  input,  gzip(1)
       and bzip2(1) compressed files are not supported.

       If  xzgrep  is  invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1).  The same applies to names lzgrep, lze-
       grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils.

ENVIRONMENT

       GREP   If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1).

SEE ALSO

       grep(1), xz(1), gzip(1), bzip2(1), zgrep(1)

Tukaani 							    2010-09-27								 XZGREP(1)
All times are GMT -4. The time now is 02:14 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy