Sponsored Content
Top Forums Shell Programming and Scripting Replace value of a variable in a file through script using sed Post 302668067 by rituparna_gupta on Sunday 8th of July 2012 01:22:39 PM
Old 07-08-2012
Replace value of a variable in a file through script using sed

Hi,

I am trying to replace the value of a variable in a file through another script.

Example:
Filename : abc.txt contents:
a=10
b=20
c=30

Need to change the value of, say, b - Tried using the following:
Code:
sed "s/${b}/15/g" abc.txt

Have tried various forms of sed (with single quotes, without quotes, with -e option, etc) but getting the same error with all:
Code:
sed: -e expression #1, char 0: no previous regular expression

Smilie

Thanks for any help in advance Smilie
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

replace with value of variable using SED

Hello everyone, I need to replace a pattern with "value of a variable" using sed but no luck. i tried the below ABC=STR2 sed 's/STR1/$ABC/g' <file> (also tried \ , $ and " in combination but failed) Appreciate any help. Thanks Prvn (2 Replies)
Discussion started by: prvnrk
2 Replies

2. Shell Programming and Scripting

Using sed to replace a string in file with a string in a variable that contains spaces

Hi, i call my shell like: my_shell "my project name" my script: #!/bin/bash -vx projectname=$1 sed s/'PROJECT_NAME ='/'PROJECT_NAME = '$projectname/ <test_config_doxy >temp cp temp test_config_doxy the following error occurres: sed s/'PROJECT_NAME ... (2 Replies)
Discussion started by: vivelafete
2 Replies

3. Shell Programming and Scripting

using file-and-replace sed command with the use of a variable?

Ok, so, let's say I have the variable $GMAILID....How can I use it with sed command so to replace a string in a file? e.g.: sed -i 's/$GMAILID/test@gmail.com/' /home/$USER/Desktop/sendmail (4 Replies)
Discussion started by: hakermania
4 Replies

4. Shell Programming and Scripting

Replace a var in sql file with shell script variable

I have a requirement where i have a sql file (filetext.sql). This file contains a variable ss_code. Now in a shell script im trying to replace the variable ss_code with a value contained in the shell script variable MTK_DC..tried the below in the script MTK_DC="mit,cit,bit" OUT=`awk -v... (4 Replies)
Discussion started by: michaelrozar17
4 Replies

5. Shell Programming and Scripting

replace (sed?) a string in file with multiple lines (string) from variable

Can someone tell me how I can do this? e.g: a=$(echo -e wert trewt ertert ertert ertert erttert erterte rterter tertertert ert) How do i replace the STRING with $a? I try this: sed -i 's/STRING/'"$a"'/g' filename.ext but this don' t work (2 Replies)
Discussion started by: jforce
2 Replies

6. Red Hat

How to pass value of pwd as variable in SED to replace variable in a script file

Hi all, Hereby wish to have your advise for below: Main concept is I intend to get current directory of my script file. This script file will be copied to /etc/init.d. A string in this copy will be replaced with current directory value. Below is original script file: ... (6 Replies)
Discussion started by: cielle
6 Replies

7. Shell Programming and Scripting

sed/awk script to replace only FIRST comment in the file

My first comment on every file contains the license message. I want to replace with a new license message. I used the below sed script, which replaces all comments. What is the modification or any other method with awk script for the below to edit only the first comment(license message)? #sed -f... (1 Reply)
Discussion started by: vpshastry
1 Replies

8. Shell Programming and Scripting

How to replace a string with a variable in a file using sed?

I have a file having some text like: PATH_ABC=/user/myLocation I have to replace "/user/myLocation" with a session variable say, $REPLACE_PATH, where $REPLACE_PATH=/user/myReplaceLocation The following sed command is not working. It is writing PATH_ABC=$REPLACE_PATH in the file ... (2 Replies)
Discussion started by: SKhan
2 Replies

9. Shell Programming and Scripting

Sed/replace using variable

Hello everyone, In one of my shell script I am doing sed/replace using a variable to find a string in a file & replace it with another string in same file. The challenge which I am facing is that, the variable which I am using with "sed" is having one of character as "/" Here is below how... (4 Replies)
Discussion started by: gr8_usk
4 Replies

10. UNIX for Beginners Questions & Answers

Awk/sed to replace variable in file

Hi All I have one file with multiple lines in it, each line has static text and some variable enclosed in <<filename>> as well. e.g. as below 123, <<file1.txt>> this is my name, I stay at <<city.txt>> Thanks for visiting 348384y, this is my name <<fileabc.txt>>, I stay at near the mall of... (8 Replies)
Discussion started by: reldb
8 Replies
Locale::Script(3perl)					 Perl Programmers Reference Guide				     Locale::Script(3perl)

NAME
Locale::Script - standard codes for script identification SYNOPSIS
use Locale::Script; $script = code2script('phnx'); # 'Phoenician' $code = script2code('Phoenician'); # 'Phnx' $code = script2code('Phoenician', LOCALE_CODE_NUMERIC); # 115 @codes = all_script_codes(); @scripts = all_script_names(); DESCRIPTION
The "Locale::Script" module provides access to standards codes used for identifying scripts, such as those defined in ISO 15924. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 15924 four-letter codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying scripts. The ones currently supported are: alpha This is a set of four-letter (capitalized) codes from ISO 15924 such as 'Phnx' for Phoenician. This code set is identified with the symbol "LOCALE_SCRIPT_ALPHA". The Zxxx, Zyyy, and Zzzz codes are not used. This is the default code set. numeric This is a set of three-digit numeric codes from ISO 15924 such as 115 for Phoenician. This code set is identified with the symbol "LOCALE_SCRIPT_NUMERIC". ROUTINES
code2script ( CODE [,CODESET] ) script2code ( NAME [,CODESET] ) script_code2code ( CODE ,CODESET ,CODESET2 ) all_script_codes ( [CODESET] ) all_script_names ( [CODESET] ) Locale::Script::rename_script ( CODE ,NEW_NAME [,CODESET] ) Locale::Script::add_script ( CODE ,NAME [,CODESET] ) Locale::Script::delete_script ( CODE [,CODESET] ) Locale::Script::add_script_alias ( NAME ,NEW_NAME ) Locale::Script::delete_script_alias ( NAME ) Locale::Script::rename_script_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Script::add_script_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Script::delete_script_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes man page. SEE ALSO
Locale::Codes Locale::Constants http://www.unicode.org/iso15924/ Home page for ISO 15924. AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 1997-2001 Canon Research Centre Europe (CRE). Copyright (c) 2001-2010 Neil Bowers Copyright (c) 2010-2011 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2011-09-26 Locale::Script(3perl)
All times are GMT -4. The time now is 06:02 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy