More Grep - Regular Expressions

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

grep and regular expressions

Hi All, For the past many days I have solved a lot of grep and regular expression questions, Now I am in a search for a good quality set of questions that can help me build and check my knowledge of grep with regular expressions, it would be great if anyone could help me with my requirement. ...

2. Homework & Coursework Questions

Regular Expressions with GREP

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: Given a text file (big_english.txt) containing roughly 250,000 words, answer the following using grep and...

3. UNIX for Dummies Questions & Answers

extract columns using grep or regular expressions

I am trying to print columns from a table whose name (header) matches a certain string. E.g., patient1001 patient1002 patient2005 patient3005 patient4001 0 0 0 0 0 2 9 2 8 3 2 7 3 0 2 Say I want to print columns whose names end with "01" patient1001 patient4001 0 0 2 3 2 2 ...

4. Shell Programming and Scripting

Regular Expressions

Hi Ilove unix and alwyas trying to to learn unix,but i am weak in using regular expressions.can you please give me a littel brief discription that how can i understand them and how to use .your response could lead a great hand in my unix love.

5. Shell Programming and Scripting

Regular Expressions

I am new to shell scripts.Can u please help me on this req. test_user = "Arun" if echo "test_user is a word" else echo "test_user is not a word"

6. Shell Programming and Scripting

How to grep using a line break in regular expressions?

Hi, I have a file as below, {#### if file then file else file } print file i need to fine the count of all the pattern - file, inside the { } i'm using a grep command as grep -c \{'*file*'\} fake.sh\ It doesn't gives me any result, i think the problem here is the...

7. Shell Programming and Scripting

Regular Expressions

#!/usr/bin/perl $word = "one last challenge"; if ( $word =~ /^(\w+).*\s(\w+)$/ ) { print "$1"; print "\n"; print "$2"; } The output shows that "$1" is with result one and "$2" is with result challenge. I am confused about how this pattern match expression works step by step. I...

8. UNIX for Dummies Questions & Answers

Regular expressions

In regular expressions with grep(or egrep), ^ works if we want something in starting of line..but what if we write ^^^ or ^ for pattern matching??..Hope u all r familiar with regular expressions for pattern matching..

9. Shell Programming and Scripting

searching regular expressions with special characters like dot using grep

hi everybody I am a new user to this forum and its previous posts have been very useful. I'm searching in a file using grep for patterns like 12.13.444 55.44.443 i.e. of form <digit><digit>.<digit><digit>.<digit><digit><digit> Can anybody help me with this. Thanks in advance

10. UNIX for Dummies Questions & Answers

grep and regular expressions :

I wrote a simple korn shell where I am trying to filter all the good record layouts of a file to only leave the bad ones to look at. That file is hudge. Aside from '# comments' and 'var=ssss', all record should follow a specific record layout, with comma seperated fields. Some fields can have any...

LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)

UNIX for Dummies Questions & Answers