Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: regexp to get first line of string
Top Forums Shell Programming and Scripting regexp to get first line of string Post 302116754 by jonas.gabriel on Tuesday 8th of May 2007 09:46:40 AM
Old 05-08-2007
Question regexp to get first line of string
Hi everybody

Code:
for file in *
#Bash performs filename expansion
#+ on expressions that globbing recognizes.
do
	
	output="`grep -n "$1" "$file"`"
	echo "$file: `expr "$output" : '\(^.*$\)'`"

done

In the above bash script segment, I try to print just the first line of string named output.

I've got a problem with the regexp. It returns the full string which is multilined.

Thank you in advance for any help
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

RegExp: From first occurrance to last (at line start)

So I have a log that contains something like this: What I want is to get the first occurrence of "^localhost0" (at line start) and then everything else up to the last occurrence of "^localhost0" (at line start) Ideally I don't even care about the 2 "localhost0" lines either. All I really... (6 Replies)
Discussion started by: jjinno
6 Replies

2. UNIX for Dummies Questions & Answers

print the line immediately after a regexp; but regexp is a sentence

Good Day, Im new to scripting especially awk and sed. I just would like to ask help from you guys about a sed command that prints the line immediately after a regexp, but not the line containing the regexp. sed -n '/regexp/{n;p;}' filename What if my regexp is 3 word or a sentence. Im... (3 Replies)
Discussion started by: ownins
3 Replies

3. Shell Programming and Scripting

use regexp to insert newline within a line

I have successfully used regexp and sed to insert a newline before or after a line containing a matched pattern /WORD/. However, I want to insert a newline immediately following /WORD/ and not after the -line- containing the pattern matched. I can match a pattern, but it is matched via a wild card... (2 Replies)
Discussion started by: kpeirce
2 Replies

4. Shell Programming and Scripting

...yet another string of awk/sed questions from a RegExp-Challenged luser %-\

Greetings all, ...here is yet another string of awk/sed questions from a RegExp-Challenged luser :eek: I'm looking to have sed/awk do some clean-up on routing tables and to that end, I would like to do the following: 1.) If a line contains the word "masks" or "subnets" prepend CR/LF to... (16 Replies)
Discussion started by: SteveB-in-LV
16 Replies

5. Shell Programming and Scripting

extract string until regexp from backside

Hi, I searched in the forums, but I didn't find a good solution. My problem is: I have a string like "TEST.ABC201005.MONTHLY.D101010203". I just want to have the string until the D100430, so that the string should look like: "TEST.ABC201005.MONTHLY.D" The last characters after the D can be... (8 Replies)
Discussion started by: elifchen
8 Replies

6. UNIX for Dummies Questions & Answers

regexp: match string that contains list of chars

Hi, I'm curious about how to do a very simple thing with regular expressions that I'm unable to figure out. If I want to find out if a string contains 'a' AND 'b' AND 'c' it can be very easily done with grep: echo $STRING|grep a|grep b|grep c but, how would you do that in a single... (9 Replies)
Discussion started by: jimcanoa
9 Replies

7. Shell Programming and Scripting

How to use regexp to find an ipaddress from a query string?

I need help with a regexp to find out the ip address which can possibly be present in a URL. The URLs can be in any of the following form <domain>?a=12345&d=somestring1 <domain>?c=10.10.10.100&d=somestring1 <domain>?a=12345&b=somestring1&c=10.1.2.4d=somestring2... (3 Replies)
Discussion started by: ampak
3 Replies

8. Shell Programming and Scripting

Regexp for string that might contain a given character

I'm probably just not thinking of the correct term to search for :-) But I want to match a pattern that might be 'ABC' or '1ABC' there might be three characters, or there might be four, but if there are four, the first has to be 1 (1 Reply)
Discussion started by: jnojr
1 Replies

9. Shell Programming and Scripting

Print 4th line back from regexp

I'm looking for a way to print the 4th line back from a regular expression. Kind of like the below but it has to be the 4th line before the regexp. Print the line immediately before regexp, but not the line containing the regexp. sed -n '/regexp/{g;1!p;};h' here is an example of logs(i... (11 Replies)
Discussion started by: senormarquez
11 Replies

10. Shell Programming and Scripting

find and Replace String in Perl - Regexp

Trying to find and replace one string with another string in a file #!/usr/bin/perl $csd_table_path = "/file.ntab"; $find_str = '--bundle_type=021'; $repl_str = '--bundle_type=021 --target=/dev/disk1s2'; if( system("/usr/bin/perl -p -i -e 's/$find_str/$repl_str/' $csd_table_path")... (2 Replies)
Discussion started by: cillmor
2 Replies

LEARN ABOUT POSIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other 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 the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
All times are GMT -4. The time now is 09:15 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy