Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: sed command on AIX, replace specific characters
Top Forums Shell Programming and Scripting sed command on AIX, replace specific characters Post 302995078 by Scrutinizer on Friday 31st of March 2017 12:26:15 PM
Old 03-31-2017
Hi,

What we forgot to mention in the other thread is that when you use 000 instead of ... then you need to use an anchor for the beginning of the line in the form of a caret ( ^ ), otherwise it will try to match 000 with 136 arbitrary characters before it ..

--
Further, alternation is not part of regular sed (which uses BRE, basic regular expressions), instead try specifying the substitution twice:
Code:
sed '/^4000/{s/^\(.\{136\}\)000/\1036/; s/^\(.\{136\}\) 36/\1036/;}' file


---
Alternation would have worked with GNU sed with the -r option (or BSD sed with the -E option) that allows the use of extended regular expressions (ERE), which does have alternation, but GNU sed is usually not present as standard on AIX.
Try:
Code:
sed -r '/^4000/s/^(.{136})( 36|000)/\1036/' file

Last edited by Scrutinizer; 04-01-2017 at 03:39 AM..
This User Gave Thanks to Scrutinizer For This Post:
dsid
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

using sed to replace a specific string on a specific line number using variables

using sed to replace a specific string on a specific line number using variables this is where i am at grep -v WARNING output | grep -v spawn | grep -v Passphrase | grep -v Authentication | grep -v '/sbin/tfadmin netguard -C'| grep -v 'NETWORK>' >> output.clean grep -n Destination... (2 Replies)
Discussion started by: todd.cutting
2 Replies

2. Shell Programming and Scripting

Using sed to replace specific character and specific position

I am trying to use sed to replace specific characters at a specific position in the file with a different value... can this be done? Example: File: A0199999123 A0199999124 A0199999125 Need to replace 99999 in positions 3-7 with 88888. Any help is appreciated. (5 Replies)
Discussion started by: programmer22
5 Replies

3. Shell Programming and Scripting

Find and replace a string a specific value in specific location in AIX

Hi, I have following samp.txt file in unix. samp.txt 01Roy2D3M000000 02Rad2D3M222222 . . . . 10Mik0A2M343443 Desired Output 01Roy2A3M000000 02Rad2A3M222222 . . (5 Replies)
Discussion started by: techmoris
5 Replies

4. Shell Programming and Scripting

Replace specific field on specific line sed or awk

I'm trying to update a text file via sed/awk, after a lot of searching I still can't find a code snippet that I can get to work. Brief overview: I have user input a line to a variable, I then find a specific value in this line 10th field in this case. After asking for new input and doing some... (14 Replies)
Discussion started by: crownedzero
14 Replies

5. Shell Programming and Scripting

Awk command to replace specific position characters.

Hi, I have a fixed width file. The way this file works is say for example there are 30 columns in it each with different sizes say 10,5,2, etc... If data in a field is less than the field size the rest of it is loaded with spaces. I would like an awk command to that would replace I have... (8 Replies)
Discussion started by: pinnacle
8 Replies

6. Shell Programming and Scripting

sed replacing specific characters and control characters by escaping

sed -e "s// /g" old.txt > new.txt While I do know some control characters need to be escaped, can normal characters also be escaped and still work the same way? Basically I do not know all control characters that have a special meaning, for example, ?, ., % have a meaning and have to be escaped... (11 Replies)
Discussion started by: ijustneeda
11 Replies

7. Shell Programming and Scripting

Replace specific characters until pattern

Hi experts, My file looks something like this. abcXX4,7,234 abc,defg,45XX23,74,123 The number of commas left of the XX can vary. The question is how can I replace all the commas left of the 'XX' with an underscore? abcXX4,7,234 abc_defg_45XX23,74,123 Thanks! (5 Replies)
Discussion started by: abercrom
5 Replies

8. Shell Programming and Scripting

Find and replace with 0 for characters in a specific position

Need command for position based replace: I need a command to replace with 0 for characters in the positions 11 to 20 to all the lines starts with 6 in a file. For example the file ABC.txt has: abcdefghijklmnopqrstuvwxyz 6abcdefghijklmnopqrstuvwxyz abcdefghijklmnopqrstuvwxyz... (4 Replies)
Discussion started by: thangabalu
4 Replies

9. UNIX for Dummies Questions & Answers

How to replace and remove few junk characters from a specific field?

I would like to remove all characters starting with "%" and ending with ")" in the 4th field - please help!! 1412007819.864 /device/services/heartbeatxx 204 0.547%!i(int=0) 0.434 0.112 1412007819.866 /device/services/heartbeatxx 204 0.547%!i(int=1) 0.423 0.123... (10 Replies)
Discussion started by: snemuk14
10 Replies

10. Shell Programming and Scripting

Replace Language Specific Characters in File

Hi Team, I have requirement to replace Language Specific Characters in File. We have set of characters, it should be replaced to a different character in the file. I have around 38 characters which should replaced to different destination character. Please help. Thanks Bharat (3 Replies)
Discussion started by: bharath561989
3 Replies

LEARN ABOUT LINUX

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)
All times are GMT -4. The time now is 02:45 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy