Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: SED is making my head-hurt...
Top Forums Shell Programming and Scripting SED is making my head-hurt... Post 302271345 by mxedit10n on Thursday 25th of December 2008 12:23:03 AM
Old 12-25-2008
[SOLVED] SED is making my head-hurt...
Hi all!


Shell-scripting n00bie here... I'm having a terrible time getting my head around how to use the sed command & could really use some help. Basically, I'm trying to use sed to remove all characters of a line up to a '<' character within a text-file. It would be spectacular if there would even be a way to do-that on all lines wthin a text-file, as I'm looking to execute this sed command within a shell-script.

Tried the following so-far:

Code:
sed 's/.^<//' $filename

Code:
sed 's/^<//' $filename

Code:
sed 's/.$<//' $filename

Code:
sed 's/$<//' $filename

Thanks!
Last edited by mxedit10n; 12-26-2008 at 10:48 AM..
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

sed : Making changes in the same file

sed 's/abc/xyz/g' abc.txt > abc.txt This change all the abc s in abc.txt to xyz s but does not write back to the abc.txt. Suggest me the cleaner way without using temp file please. Cheers, Amol. (3 Replies)
Discussion started by: amol
3 Replies

2. Shell Programming and Scripting

Making substring with sed

Input: You can easily do this by highlighting your code. How can i get the substring from index 9 to 12 using sed? (6 Replies)
Discussion started by: cola
6 Replies

3. Shell Programming and Scripting

Sed is doing my head in! How do you remove the first character of a string?

Hello! Please bare with me, I'm a total newbie to scripting. Here's the sudo code of what I'm trying to do: Get file name Does file exist? If true get length of file name get network id (this will be the last 3 numbers of the file name) loop x 2 If... (1 Reply)
Discussion started by: KatieV
1 Replies

4. Shell Programming and Scripting

non alpha characters in sed + making it fast?

hello, I'm trying to write the fastest sed command possible (large files will be processed) to replace RICH with NICK in a file which looks like this (below) if the occurance of RICH is uppercase, replace with uppercase if it's lowercase, replace with lowercase SOMTHING_RICH_SOMTHING <- replace... (10 Replies)
Discussion started by: rich@ardz
10 Replies

5. Shell Programming and Scripting

Making use of multiple cores for running sed and awk scripts

Hi All, After reading that the sort command in Linux can be made to use many processor cores just by using a simple script which I found on the internet, I was wondering if I can use similar techniques for programs like the awk and sed? #!/bin/bash # Usage: psort filename <chunksize>... (7 Replies)
Discussion started by: shoaibjameel123
7 Replies

6. Shell Programming and Scripting

making the first character of word using uppercase using awk and sed

I want to make the first character of some words to be uppercase. I have a file like the one below. uid,givenname,sn,cn,mail,telephonenumber mattj,matt,johnson,matt johnson,mattj@gmail.com markv,mark,vennet,matt s vennet,markv@gmail.com mikea,mike,austi,mike austin,mike@gmail.com I want... (3 Replies)
Discussion started by: matt12
3 Replies

7. Shell Programming and Scripting

making sed command case insensitive

i have something like this in a file cat onlytables.sql create table NextID ( id int auto_increment, zoneID int, entityName varchar(64), nextID int, lastModified TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, primary... (6 Replies)
Discussion started by: vivek d r
6 Replies

8. Shell Programming and Scripting

making find/sed to include directory names with spaces

how can i make find/sed to include directory names with spaces the command is like this for i in `find wp-content/themes -type f -print0 | xargs -0 grep -l -iE 'e'`;do sed -i -e 's/word1/word2/gI' "$i";done but it skips one directory names with spaces sed: can't read ./Nova: No such... (5 Replies)
Discussion started by: vanessafan99
5 Replies

9. UNIX for Dummies Questions & Answers

What should be precedence of using awk, sed, head and tail in UNIX?

Hi All, I am new to unix. In this forum some days back, I have read something like below: 1) Do not use perl if awk can do your work. 2) Do not use awk if sed can do your work. . . . I do not re-collect the whole thing. I think it is good to know the precedence of using these... (2 Replies)
Discussion started by: Prathmesh
2 Replies

10. UNIX for Beginners Questions & Answers

Making SED case insensitive

Dears, In the below string, please let me know how to make the sed search case-incensitive. I have more such lines in my script instead of let me know any other easier option. sed -n '/dn: MSISDN=/,/^\s*$/p' full.ldif > temp ; sed -n... (4 Replies)
Discussion started by: Kamesh G
4 Replies

LEARN ABOUT CENTOS

lksh

LKSH(1) 						    BSD General Commands Manual 						   LKSH(1)

NAME

     lksh -- Legacy Korn shell built on mksh

SYNOPSIS

     lksh [-+abCefhiklmnprUuvXx] [-+o opt] [-c string | -s | file [args ...]]

DESCRIPTION

     lksh is a command interpreter intended exclusively for running legacy shell scripts.  It is built on mksh; refer to its manual page for
     details on the scripting language.  It is recommended to port scripts to mksh instead of relying on legacy or idiotic POSIX-mandated behav-
     iour, since the MirBSD Korn Shell scripting language is much more consistent.

LEGACY MODE

     lksh has the following differences from mksh:

     o	 lksh is not suitable for use as /bin/sh.

     o	 There is no explicit support for interactive use, nor any command line editing or history code.  Hence, lksh is not suitable as a user's
	 login shell, either; use mksh instead.

     o	 The KSH_VERSION string identifies lksh as ``LEGACY KSH'' instead of ``MIRBSD KSH''.

     o	 lksh only offers the traditional ten file descriptors to scripts.

     o	 lksh uses POSIX arithmetics, which has quite a few implications: The data type for arithmetics is the host ISO C long data type.  Signed
	 integer wraparound is Undefined Behaviour.  The sign of the result of a modulo operation with at least one negative operand is unspeci-
	 fied.	Shift operations on negative numbers are unspecified.  Division of the largest negative number by -1 is Undefined Behaviour.  The
	 compiler is permitted to delete all data and crash the system if Undefined Behaviour occurs.

     o	 The rotation arithmetic operators are not available.

     o	 The shift arithmetic operators take all bits of the second operand into account; if they exceed permitted precision, the result is
	 unspecified.

     o	 The GNU bash extension &> to redirect stdout and stderr in one go is not parsed.

     o	 The mksh command line option -T is not available.

     o	 Unless set -o posix is active, lksh always uses traditional mode for constructs like:

	       $ set -- $(getopt ab:c "$@")
	       $ echo $?

	 POSIX mandates this to show 0, but traditional mode passes through the errorlevel from the getopt(1) command.

     o	 lksh, unlike AT&T UNIX ksh, does not keep file descriptors > 2 private.

SEE ALSO

     mksh(1)

     https://www.mirbsd.org/mksh.htm

     https://www.mirbsd.org/ksh-chan.htm

CAVEATS

     lksh tries to make a cross between a legacy bourne/posix compatibl-ish shell and a legacy pdksh-alike but ``legacy'' is not exactly speci-
     fied.

     The set built-in command does not have all options one would expect from a full-blown mksh or pdksh.

     Talk to the MirOS development team using the mailing list at <miros-mksh@mirbsd.org> or the #!/bin/mksh (or #ksh) IRC channel at
     irc.freenode.net (Port 6697 SSL, 6667 unencrypted) if you need any further quirks or assistance, and consider migrating your legacy scripts
     to work with mksh instead of requiring lksh.

MirBSD								    May 2, 2013 							    MirBSD
All times are GMT -4. The time now is 01:31 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy