egrep supports extended regular expressions, which lets you do things like this:
Code:
ls | egrep -v "\.(jpg|xml|sql)$"
The \. matches one literal "." character, the (jpg|xml|sql) matches jpg, xml, or sql, and the $ tells grep the expression has to be at the end of the line.
-v inverts the results, so that you get all the results which don't match the pattern.
Hi,
I am trying to delete a load of core files, but make sure I only delete core files. The system I am using has many files with core in the name, so I obviously can not simply search for "core".
I have tried using the 'find' command with pattern matching via , and know that his is the way... (3 Replies)
Hi,
I am writing a BASH shell script. I would like to count all the files in the CURRENT directory matching a specific pattern. Could someone suggest the best/simplest way to do this. I have thought of these solutions (for simplicity the pattern is all files starting with A):
ls -1 *A | wc -l... (5 Replies)
Hi,
i need to break a file into 2 files afetr matching a pattern
for ex. there is a fil, file .txt which contains
here i need to look for mat $ demon if it matches then i need to transfer the data into another file till the line in which a "d6s" comes,and i have to delete tat line... (3 Replies)
Hi,
I have following files in my directory:
/TESTDONTDEL> ls -alt
total 14
drwxr-xr-x 2 oracle dba 1024 May 15 06:30 .
-rw-r--r-- 1 oracle dba 40 May 15 06:30 exception.txt
-rw-r--r-- 1 oracle dba 19 May 15 06:22 ful_1234_test1.txt
-rw-r--r-- 1... (2 Replies)
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:
Write an automated shell program(s) that can create, monitor the log files and report the issues for matching... (0 Replies)
Hi friends.. I have many dirs in my working directory. Every dir have thousands of files (.jsp, .java, .xml..., etc). So I am working with an script to find every file recursively within those directories and subdirectories ending with .jsp or .java which contains inside of it, the the pattern... (3 Replies)
I am on ubuntu 11.10 using bash scripts
I want to remove all files matching a string pattern and I am using the following code
find . -name "*$pattern*" -exec rm -f {} \;I have encountered a problem when $pattern is empty. In this case all my files in my current directory were deleted. This... (3 Replies)
Hi Techies,
I need a help in finding junk characters and remove them from a Datafile.
we have a file and it had crores of records like below
SGSN_MCC_MNC=01150
but sometime due to the issue with sending server we are getting some junk characters in the middle of data like below
... (6 Replies)
Hi All
I am having one awk and sed requirement for the below problem.
I tried multiple options in my sed or awk and right output is not coming out.
Problem Description
###############################################################
I am having a big file say file having repeated... (4 Replies)
I have wrote this small program to check for installed and missing packages in LINUX (RHEL x86_64)
For now it perfectly prints all the installed and missing packages however I want that it loops through to the end (in either case) and
list all packages however if one or more packages are... (5 Replies)
Discussion started by: Dazzler74
5 Replies
LEARN ABOUT BSD
egrep
GREP(1) General Commands Manual GREP(1)NAME
grep, egrep, fgrep - search a file for a pattern
SYNOPSIS
grep [ option ] ... expression [ file ] ...
egrep [ option ] ... [ expression ] [ file ] ...
fgrep [ option ] ... [ strings ] [ file ]
DESCRIPTION
Commands of the grep family search the input files (standard input default) for lines matching a pattern. Normally, each line found is
copied to the standard output. Grep patterns are limited regular expressions in the style of ex(1); it uses a compact nondeterministic
algorithm. Egrep patterns are full regular expressions; it uses a fast deterministic algorithm that sometimes needs exponential space.
Fgrep patterns are fixed strings; it is fast and compact. The following options are recognized.
-v All lines but those matching are printed.
-x (Exact) only lines matched in their entirety are printed (fgrep only).
-c Only a count of matching lines is printed.
-l The names of files with matching lines are listed (once) separated by newlines.
-n Each line is preceded by its relative line number in the file.
-b Each line is preceded by the block number on which it was found. This is sometimes useful in locating disk block numbers by con-
text.
-i The case of letters is ignored in making comparisons -- that is, upper and lower case are considered identical. This applies to
grep and fgrep only.
-s Silent mode. Nothing is printed (except error messages). This is useful for checking the error status.
-w The expression is searched for as a word (as if surrounded by `<' and `>', see ex(1).) (grep only)
-e expression
Same as a simple expression argument, but useful when the expression begins with a -.
-f file
The regular expression (egrep) or string list (fgrep) is taken from the file.
In all cases the file name is shown if there is more than one input file. Care should be taken when using the characters $ * [ ^ | ( ) and
in the expression as they are also meaningful to the Shell. It is safest to enclose the entire expression argument in single quotes ' '.
Fgrep searches for lines that contain one of the (newline-separated) strings.
Egrep accepts extended regular expressions. In the following description `character' excludes newline:
A followed by a single character other than newline matches that character.
The character ^ matches the beginning of a line.
The character $ matches the end of a line.
A . (period) matches any character.
A single character not otherwise endowed with special meaning matches that character.
A string enclosed in brackets [] matches any single character from the string. Ranges of ASCII character codes may be abbreviated
as in `a-z0-9'. A ] may occur only as the first character of the string. A literal - must be placed where it can't be mistaken as
a range indicator.
A regular expression followed by an * (asterisk) matches a sequence of 0 or more matches of the regular expression. A regular
expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression. A regular expression followed
by a ? (question mark) matches a sequence of 0 or 1 matches of the regular expression.
Two regular expressions concatenated match a match of the first followed by a match of the second.
Two regular expressions separated by | or newline match either a match for the first or a match for the second.
A regular expression enclosed in parentheses matches a match for the regular expression.
The order of precedence of operators at the same parenthesis level is [] then *+? then concatenation then | and newline.
Ideally there should be only one grep, but we don't know a single algorithm that spans a wide enough range of space-time tradeoffs.
SEE ALSO ex(1), sed(1), sh(1)DIAGNOSTICS
Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.
BUGS
Lines are limited to 256 characters; longer lines are truncated.
4th Berkeley Distribution April 29, 1985 GREP(1)