Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Substitute a character with sed
Top Forums UNIX for Beginners Questions & Answers Substitute a character with sed Post 303032286 by MadeInGermany on Thursday 14th of March 2019 06:10:18 PM
Old 03-14-2019
Bakunin's replacement code in post#4 is portable but still creates a new inode for the input file ("/path/to/file")
This not only denotes a repair of the original owner/group/permissions, it will make a previously hard-linked file stand-alone, and this damage cannot be repaired.
Also GNU sed -i (and perl -i) cannot preserve the original linkage.
If we are going for a real improvement then we avoid the mv command!
Code:
if sed '....' /path/to/file > /path/to/file.tmp ; then
     cp  /path/to/file.tmp  /path/to/file
else
     <error handling procedure here>
fi

The cp command preserves the original inode (owner/group/permissions and linkage) - only the timestamp changes, and that's pretty correct.
This User Gave Thanks to MadeInGermany For This Post:
bakunin
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

sed substitute situation

I am having a problem executing a sed substitute in a file. I have tried alot of different things I found in previous posts, however non seem to work. I want to substitute this in $FILE: VALUE=33.4 In the script I have tried the following: prev=$(awk -F"=" '{ print $2 }' $FILE ) new=$(echo... (16 Replies)
Discussion started by: newbreed1
16 Replies

2. UNIX for Dummies Questions & Answers

read a variable character by character, substitute characters with something else

im having trouble doing this: i have a variable with 2 characters repeating e.g. aababbbaaaababaabbaabbba is there a way i can search the variable for a's and b's and then change a's to b's and b's to a's? im guessing its like getting the 1's compliment of the string im doing this in... (2 Replies)
Discussion started by: vipervenom25
2 Replies

3. Shell Programming and Scripting

Using SED to substitute between two patterns.

Hi All, I'm currently using SED to make various changes to some .xml files I'm working on, but I'm stuck on this particular problem. I want to remove '<placeholder>element-name</placeholder>' from the following: <heading>Element <placeholder>element-name</placeholder> not... (2 Replies)
Discussion started by: Steve_altius
2 Replies

4. AIX

check for a particular character inside a file and substitute with a given character?

i am a newbie to shell script,so i want a kshell script in which i need to check for a particular character inside a file through conditional looping(like if ,case,while)and if that character exists ,then substitute a given character to that character. consider a file test.txt,inside the file... (1 Reply)
Discussion started by: karthikprasathk
1 Replies

5. Shell Programming and Scripting

Using sed to substitute first occurrence

I am trying to get rid of some ending tags but I run into some problems. Ex. How are you?</EndTag><Begin>It is fine.</Begin><New> Just about I am trying to get rid of the ending tags, starts with </ and ending with >. (which is </EndTag> and </Begin>) I tried the following sed... (2 Replies)
Discussion started by: quixoticking11
2 Replies

6. UNIX for Dummies Questions & Answers

Using sed to substitute between quotes.

I'm using sed to perform a simply search and replace. The typical data is: <fig><image href="Graphics/BAV.gif" align="left" placement="break" I need to replace the value in the first set of quotes, keeping the remainder of the line the same. Thus: <fig><image href="NEW_VALUE" align="left"... (3 Replies)
Discussion started by: Steve_altius
3 Replies

7. Shell Programming and Scripting

Sed question to substitute data in \2

Hi All, Here is what I'm trying to do with sed: Input File: somechangeVariable1=Something I would like to change somechangeVariable2=Something else I would like to change ... Output File: somechangeVariable1=Something I would like to different somechangeVariable2=Something else I would... (6 Replies)
Discussion started by: Peace_Dude1
6 Replies

8. Shell Programming and Scripting

using sed or gsub to substitute characters!

Is there a way to substitute the URL-encoding references of ( & and ` ) with their actual appearance? for example.... %26 is & say I want to convert every %26 in my file to &..... awk '{gsub(/%26/,"&");print}' Is there a way to do this? I also want to be able to convert ` too! (3 Replies)
Discussion started by: puttster
3 Replies

9. Shell Programming and Scripting

How to substitute variable in sed for special character?

Hi , I have input file like below Hi this is "vinoth". Hi happy to work with 'unix' USA(united states of America) My script variables are below : Dquote=Ộ Squote=&#$567 Obrac=&^986 Cbrac=&^745 I want to read the variables in my SED command to replace the double quote,single... (9 Replies)
Discussion started by: vinothsekark
9 Replies

10. Shell Programming and Scripting

sed substitute command -- need help

I am trying to do what I thought should be a simple substitution, but I can't get it to work. File: Desire output: I thought I'd start with a sed command to remove the part of the header line preceding the string "comp", then go on to remove the suffix of the target string (e.g. ":3-509(-)"),... (3 Replies)
Discussion started by: pathunkathunk
3 Replies

LEARN ABOUT DEBIAN

cgcreate

CGCREATE(1)							 libcgroup Manual						       CGCREATE(1)

NAME

       cgcreate - create new cgroup(s)

SYNOPSIS

       cgcreate [-h] [-s] [-t <tuid>:<tgid>] [-a <agid>:<auid>] [-f mode] [-d mode] -g <controllers>:<path> [-g ...]

DESCRIPTION

       The command creates new cgroup(s) defined by the options -g.

       -a <agid>:<auid>
	      defines  the  name of the user and the group which own the rest of the defined control group's files. These users are allowed to set
	      subsystem parameters and create subgroups.  The default value is the same as has the parent cgroup.

       -d, --dperm=mode
	      sets the permissions of a control groups directory.  The permissions needs to be specified as octal numbers e.g.	-d 775.

       -f, --fperm=mode
	      sets the permissions of the control groups parameters.  The permissions needs to be specified as octal numbers e.g.   -f	775.   The
	      value  is  not  used as given because the current owner's permissions are used as an umask (so 777 will set group and others permis-
	      sions to the owners permissions).

       -g <controllers>:<path>
	      defines control groups to be added.  controllers is a list of controllers and path is the relative path to  control  groups  in  the
	      given controllers list. This option can be specified multiple times.

       -h, --help
	      display this help and exit

       -s, --tperm=mode
	      sets  the  permissions  of  the control group tasks file.  The permissions needs to be specified as octal numbers e.g.  -f 775.  The
	      value is not used as given because the current owner's permissions are used as an umask (so 777 will set group  and  others  permis-
	      sions to the owners permissions).

       -t <tuid>:<tgid>
	      defines  the  name of the user and the group, which owns tasks file of the defined control group. I.e. this user and members of this
	      group have write access to the file.  The default value is the same as has the parent cgroup.

FILES

SEE ALSO

       cgrules.conf (5) cgexec (1) cgclassify (1)

Linux								    2009-03-15							       CGCREATE(1)
All times are GMT -4. The time now is 01:45 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy