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Full Discussion: uncomment or comment one specific line in a config file
Top Forums Shell Programming and Scripting uncomment or comment one specific line in a config file Post 302514788 by jcdole on Monday 18th of April 2011 05:12:28 AM
Old 04-18-2011
Quote:
Originally Posted by mirni
try this:
Code:
line="passdb backend ="

#to comment it out:
sed -i "/${line}/ s/^/# /" $F_NAME 


#uncomment:
sed -i "/${line}/ s/# *//" $F_NAME

Great !

For my understanding
sed -i "/${line}/ s/^/# /" $F_NAME ==> in file $F_NAME search for occurence of $line and then look at the first position for # and replace it by a space ?

and
sed -i "/${line}/ s/# *//" $F_NAME ==> in file $F_NAME search for occurence of $line and then look somewhere for a space followed by everything and replace it by a # ?

That mean that the space should be not at the 1st position of the line ?

Anyway in my case that do the job.

Thank you very much

JCD
 

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LEARN ABOUT SUSE

isdnformat

isdnformat(5)						    Linux System Administration 					     isdnformat(5)

NAME

       isdnformat - common isdn config file format

DESCRIPTION

       This man page describes the format of all isdn config files.

FORMAT

       Empty lines are ignored.

       If  a  #  is  encountered, this character and the rest of the line is ignored (it's considered a comment). You can prepend a backslash  to
       prevent this and use the # character.

       If the last character of a line is a backslash , the next line is a continuation of the current line.

       The file format is like smb.conf or win.ini: there are sections and entries within the section. However, the syntax was expanded with  sub-
       sections; these can be nested as often as you like.

       All whitespace (space and tabs) at the end of the line are ignored.

       Section and entry names are case insensitive.

       Values are case sensitive, of course (the case is preserved).

       Section and entry names may not use the characters "*?|&/"; if one of these is encountered, it is ignored.

       At the beginning of the line you may use as much whitespace as you like.

       A section has the format "[" NAME "]". You may use whitespace between the braces and the name, or none at all.

       An entry has the format ENTRY "=" VALUE. You may use whitespace before and after the equal sign, or none at all.

       A subsection starts with ENTRY "=" "{"  and ends with "}". You may use sections, entries and subsections between the start and the end tag.

       Beware: unlike samba or windows the semicolon is not used for comments !

       You  can  use  INCLUDE(File) to include a file. If the filename is not absolute, it's considered relative to the directory of the including
       document. You may use it anywhere in a file, but there may be no space characters in the file!

       All subsections started in an include file must end in that include file, so the number of opened and closed brackets must match.

       Beware: recursive including will cause the program to break. The library does not prevent this.

AUTHOR

       This manual page was written by Andreas Jellinghaus <aj@dungeon.inka.de>, for Debian GNU/Linux and  isdn4linux.	 Now  maintained  by  Paul
       Slootman <paul@isdn4linux.de>.

ISDN 4 Linux 3.13						    2000/09/15							     isdnformat(5)
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