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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
 

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LEARN ABOUT DEBIAN

lfc-chown

LFC-CHOWN(1)							 LFC User Commands						      LFC-CHOWN(1)

NAME

       lfc-chown - change owner and group of a LFC directory/file in the name server

SYNOPSIS

       lfc-chown [-h] [-R] owner[:group] path...

       lfc-chown [-h] [-R] :group path...

DESCRIPTION

       lfc-chown sets the owner and/or the group of a LFC directory/file in the name server to the values in owner and group respectively.

       To change the owner ID, if the group ID does not change and if the caller and the new owner ID belong to that group, GRP_ADMIN privilege is
       needed, otherwise the caller must have ADMIN privilege in the Cupv database.  To change the group ID, the effective user ID of the  process
       must  match  the  owner	ID  of the file and the new group must be in the list of groups the caller belong to or the caller must have ADMIN
       privilege in the Cupv database.

       owner  is either a valid username or a valid numeric ID.

       group  is either a valid group name or a valid numeric ID.

       path   specifies the LFC pathname.  If path does not start with /, it is prefixed by the content of the LFC_HOME environment variable.

OPTIONS

       The following options are supported:

       -h     If path is a symbolic link, changes the ownership of the link itself.

       -R     Recursive mode.

EXIT STATUS

       This program returns 0 if the operation was successful or >0 if the operation failed.

SEE ALSO

       Castor_limits(4), lfc_chown(3), Cupvlist(1)

AUTHOR

       LCG Grid Deployment Team

LFC
							   $Date: 2007/01/15 08:05:17 $ 					      LFC-CHOWN(1)
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