How to reference a variable within sed? Post: 302123744

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Reference Variable

Hi! I need to determin the most efficient way to do something (rather simple, I thought). I'm currently echo(ing) a series of menu options, and reading the command input as the number associated with the entry. What I need to do is when the option 1 is selected, that it references a list and...

2. Shell Programming and Scripting

Unix Variable Reference and Substitution

I can't seem to make what appears to be a simple substitution. I want to define a list of systems for which daily reports need to be filed systems="systemA systemC systemZ" I then want to run a loop for i in ${systems} Analyze statistics Create the reports mailx

3. Shell Programming and Scripting

subsequently reference variable

Hello, This is not homework. It is a question that I received on a recent interview for a linux position. Can someone shed some light on the right answer? I got it wrong. Thanks, jaysunn

4. Shell Programming and Scripting

BASH - Reference external variable name dynamically

Hi there, I have included an external properties file into my BASH script via the 'source' command. I am attempting to dynamically assign a variable in the BASH script, that references the variable name within the external properties file i.e. #!/bin/bash pth=${0%/*} source...

5. Shell Programming and Scripting

Perl: accessing reference to variable inside hash.

Below is hash which contains reference to variables: my %mandatoryFields = ( 1 => \$msgtype, 2 => \$switchtype, 3 => \$card_nbr, 4 => \$natv_tran_type_code, 5 => \$amt_1 ); This...

6. Shell Programming and Scripting

Perl de-reference code reference variable

Guys, May i know how can we de reference the code reference variable.? my $a = sub{$a=shift;$b=shift;print "SUM:",($a+$b),"\n";}; print $a->(4,5); How can we print the whole function ? Please suggest me regarding this. Thanks for your time :) Cheers, Ranga :)

7. Shell Programming and Scripting

sed error: invalid reference

Hello all, I am using sed to parse a particular part of a string and am having problems. I am getting the following error: sed: -e expression #1, char 28: invalid reference \1 on `s' command's RHS Here is the code I am using: echo "Alarm SET:" echo "" echo "Date: " $DATE echo...

8. Shell Programming and Scripting

sed back reference error

I am trying to change a single line of a special file whose comment character is ! to show a path to the file in the comment. such as: !!HFSS and mcm path: \Signal_Integrity\Package_SI\Section_Models\C4toTrace\28nm\D6HS\SLC_5-2-5\GZ41_ICZ\NSSS\ to a different path and replace the !!HFSS...

9. UNIX for Dummies Questions & Answers

Extract text in sed using back reference

i have a text 20 21 22 23 24 25 26 i want to get 22 using sed back reference. I have used sed 's/{6}$..$.*/\1/' but, it does not work. I am missing something somewhere. Please help.

10. Shell Programming and Scripting

sed - use back reference in 2nd command

I have data that looks like this: <Country code="US"><tag>adsf</tag><tag>bdfs</tag></Country><Country code="CA"><tag>asdf</tag><tag>bsdf</tag></Country> I want to grab the country code save it, then drop each new "<..." onto a new line with the country code added to the beginning of each So,...

LEARN ABOUT DEBIAN

shtool-subst

SHTOOL-SUBST.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-SUBST.TMP(1)

NAME

       shtool-subst - GNU shtool sed(1) substitution operations

SYNOPSIS

       shtool subst [-v|--verbose] [-t|--trace] [-n|--nop] [-w|--warning] [-q|--quiet] [-s|--stealth] [-i|--interactive] [-b|--backup ext]
       [-e|--exec cmd] [-f|--file cmd-file] [file] [file ...]

DESCRIPTION

       This command applies one or more sed(1) substitution operations to stdin or any number of files.

OPTIONS

       The following command line options are available.

       -v, --verbose
	   Display some processing information.

       -t, --trace
	   Enable the output of the essential shell commands which are executed.

       -n, --nop
	   No operation mode. Actual execution of the essential shell commands which would be executed is suppressed.

       -w, --warning
	   Show warning on substitution operation resulting in no content change on every file. The default is to show a warning on substitution
	   operations resulted in no content change on all files.

       -q, --quiet
	   Suppress warning on substitution operation resulting in no content change.

       -s, --stealth
	   Stealth operation. Preserve timestamp on file.

       -i, --interactive
	   Enter interactive mode where the user has to approve each operation.

       -b, --backup ext
	   Preserve backup of original file using file name extension ext.  Default is to overwrite the original file.

       -e, --exec cmd
	   Specify sed(1) command directly.

       -f, --file cmd-file
	   Read sed(1) command from file.

EXAMPLE

	#   shell script
	shtool subst -i -e 's;(c) ([0-9]*)-2000;(c) 1-2001;' *.[ch]

	#    RPM spec-file
	%install
	    shtool subst -v -n 
		-e 's;^(prefix=).*;1 $RPM_BUILD_ROOT%{_prefix};g' 
		-e 's;^(sysconfdir=).*;1 $RPM_BUILD_ROOT%{_prefix}/etc;g' 
		`find . -name Makefile -print`
	    make install

HISTORY

       The GNU shtool subst command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 2001 for GNU shtool.  It was prompted
       by the need to have a uniform and convenient patching frontend to sed(1) operations in the OpenPKG package specifications.

SEE ALSO

       shtool(1), sed(1).

18-Jul-2008							   shtool 2.0.8 					       SHTOOL-SUBST.TMP(1)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Reference Variable

Discussion started by: cchaloux

2. Shell Programming and Scripting

Unix Variable Reference and Substitution

Discussion started by: mugsymark

3. Shell Programming and Scripting

subsequently reference variable

Discussion started by: jaysunn

4. Shell Programming and Scripting

BASH - Reference external variable name dynamically

Discussion started by: mjwoodford