Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: RegExp: From first occurrance to last (at line start)
Top Forums Shell Programming and Scripting RegExp: From first occurrance to last (at line start) Post 302156214 by jjinno on Monday 7th of January 2008 05:09:51 PM
Old 01-07-2008
RegExp: From first occurrance to last (at line start)
So I have a log that contains something like this:
Quote:
preparing localhost0...
[some number of lines of junk]
localhost0: ls /
bin boot dev etc home lib lib64 lost+found misc mnt net opt proc root sbin selinux srv sys tmp tools usr var
localhost0: exit
[some number of lines of junk]
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 care about is the information stored between the command and the exit call.

I cannot seem to think of a way to do this with grep... aka

Quote:
Grab the first line starting with "localhost0", plus all lines that follow, stopping at the last occurrence of "localhost0" (that is at the start of a line) prior to file end.
Any help?
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Finding occurrance of a value in a variable

Hi, I was given a question like this: Write a program which reads a set of arguments from the standard input. Note that there is no limit for the number of arguments. The first argument is the file name and the other arguments are searched in the given file. For each argument, it displays... (3 Replies)
Discussion started by: ambitious
3 Replies

2. Shell Programming and Scripting

regexp to get first line of string

Hi everybody 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... (3 Replies)
Discussion started by: jonas.gabriel
3 Replies

3. Shell Programming and Scripting

Replace Entire line if any part matches regexp

Hey guys, I have a file that I've slowly been awking, seding, and greping for data entry. I am down to pull the addresses out to insert them into an excel file. Each address is a few lines, but i want to put a semicolon delimiter in between each address so I can export the text file into excel and... (6 Replies)
Discussion started by: Cocoabean
6 Replies

4. 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

5. 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

6. Shell Programming and Scripting

Print lines between a regExp & a blank line

Hi, I have a file, say files_list, as below (o/p of ls -R cmd) $ cat files_list /remote/dir/path/to/file: sub-dir1 sub-dir2 sub-dir3 ... /remote/dir/path/to/file/sub-dir1: remote_file1.csv.tgz <blank line 1> /remote/dir/path/to/file/sub-dir2: remote_file2.csv.tgz <blank... (3 Replies)
Discussion started by: dips_ag
3 Replies

7. Shell Programming and Scripting

sed print first line before regexp and all lines after

Hi All I'm trying to extract the line just above a regexp and all lines after this. I'm currently doing this in two steps sed -n -e "/^+---/{g;p;}" -e h oldfile.txt > modified.txt sed -e "1,/^+---/d" -e "/^$/d" oldfile.txt >>modified.txt Sample sometext will be here sometext will be... (3 Replies)
Discussion started by: Celvin VK
3 Replies

8. Shell Programming and Scripting

Reading line by line from live log file using while loop and considering only those lines start from

Hi, I want to read a live log file line by line and considering those line which start from time stamp; Below code I am using, which read line but throws an exception when comparing line that does not contain error code tail -F /logs/COMMON-ERROR.log | while read myline; do... (2 Replies)
Discussion started by: ketanraut
2 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. UNIX for Beginners Questions & Answers

awk or sed to print the character from the previous line after the regexp match

Hi All, I need to print the characters in the previous line just before the regular expression match Please have a look at the input file as attached I need to match the regular expression ^ with the character of the previous like and also the pin numbers and the output file should be like... (6 Replies)
Discussion started by: kshitij
6 Replies

LEARN ABOUT SUNOS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)
All times are GMT -4. The time now is 04:29 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy