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Full Discussion: sed add line to config file
Top Forums Shell Programming and Scripting sed add line to config file Post 303013888 by MadeInGermany on Thursday 1st of March 2018 01:41:27 PM
Old 03-01-2018
You can use this "replace_append" script:
Code:
#!/bin/sh
searchkey=$1
shift
sep=$1
shift
replaceval=$1
shift
sed '
# look for the searchkey
  /^'"$searchkey$sep"'/ {
# replace the value
    s#'"$sep"'.*#'"$sep$replaceval"'#
# copy the rest of the file
    :L
    n
    bL
  }
# not found? Append a line
  $a\
'"$searchkey$sep$replaceval"'
' "$@"

And run it with
Code:
./replace_append "puid.7.edx" " = " '"----:00--:----:----:----:----:----:----"' config > config.new

If config.new looks good then copy it back to config.

The script looks for the key, if it matches then it changes the value.
If it does not find the key then it appends a line.

If you have GNU sed then you can add a -i.bak option to sed in the script. Then sed will modify the original file and leave a .bak file. (And you don't need to redirect the output.)
 

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LEARN ABOUT OSX

regexp::common::net

Regexp::Common::net(3)					User Contributed Perl Documentation				    Regexp::Common::net(3)

NAME

       Regexp::Common::net -- provide regexes for IPv4 addresses.

SYNOPSIS

	   use Regexp::Common qw /net/;

	   while (<>) {
	       /$RE{net}{IPv4}/       and print "Dotted decimal IP address";
	       /$RE{net}{IPv4}{hex}/  and print "Dotted hexadecimal IP address";
	       /$RE{net}{IPv4}{oct}{-sep => ':'}/ and
				      print "Colon separated octal IP address";
	       /$RE{net}{IPv4}{bin}/  and print "Dotted binary IP address";
	       /$RE{net}{MAC}/	      and print "MAC address";
	       /$RE{net}{MAC}{oct}{-sep => " "}/ and
				      print "Space separated octal MAC address";
	   }

DESCRIPTION

       Please consult the manual of Regexp::Common for a general description of the works of this interface.

       Do not use this module directly, but load it via Regexp::Common.

       This modules gives you regular expressions for various style IPv4 and MAC (or ethernet) addresses.

   $RE{net}{IPv4}
       Returns a pattern that matches a valid IP address in "dotted decimal".  Note that while 318.99.183.11 is not a valid IP address, it does
       match "/$RE{net}{IPv4}/", but this is because 318.99.183.11 contains a valid IP address, namely 18.99.183.11. To prevent the unwanted
       matching, one needs to anchor the regexp: "/^$RE{net}{IPv4}$/".

       For this pattern and the next four, under "-keep" (See Regexp::Common):

       $1  captures the entire match

       $2  captures the first component of the address

       $3  captures the second component of the address

       $4  captures the third component of the address

       $5  captures the final component of the address

   $RE{net}{IPv4}{dec}{-sep}
       Returns a pattern that matches a valid IP address in "dotted decimal"

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/[.]/".

   $RE{net}{IPv4}{hex}{-sep}
       Returns a pattern that matches a valid IP address in "dotted hexadecimal", with the letters "A" to "F" capitalized.

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/[.]/". "-sep=""" and "-sep=" "" are useful
       alternatives.

   $RE{net}{IPv4}{oct}{-sep}
       Returns a pattern that matches a valid IP address in "dotted octal"

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/[.]/".

   $RE{net}{IPv4}{bin}{-sep}
       Returns a pattern that matches a valid IP address in "dotted binary"

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/[.]/".

   $RE{net}{MAC}
       Returns a pattern that matches a valid MAC or ethernet address as colon separated hexadecimals.

       For this pattern, and the next four, under "-keep" (See Regexp::Common):

       $1  captures the entire match

       $2  captures the first component of the address

       $3  captures the second component of the address

       $4  captures the third component of the address

       $5  captures the fourth component of the address

       $6  captures the fifth component of the address

       $7  captures the sixth and final component of the address

       This pattern, and the next four, have a "subs" method as well, which will transform a matching MAC address into so called canonical format.
       Canonical format means that every component of the address will be exactly two hexadecimals (with a leading zero if necessary), and the
       components will be separated by a colon.

       The "subs" method will not work for binary MAC addresses if the Perl version predates 5.6.0.

   $RE{net}{MAC}{dec}{-sep}
       Returns a pattern that matches a valid MAC address as colon separated decimals.

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/:/".

   $RE{net}{MAC}{hex}{-sep}
       Returns a pattern that matches a valid MAC address as colon separated hexadecimals, with the letters "a" to "f" in lower case.

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/:/".

   $RE{net}{MAC}{oct}{-sep}
       Returns a pattern that matches a valid MAC address as colon separated octals.

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/:/".

   $RE{net}{MAC}{bin}{-sep}
       Returns a pattern that matches a valid MAC address as colon separated binary numbers.

       If "-sep=P" is specified the pattern P is used as the separator.  By default P is "qr/:/".

   $RE{net}{domain}
       Returns a pattern to match domains (and hosts) as defined in RFC 1035.  Under I{-keep} only the entire domain name is returned.

       RFC 1035 says that a single space can be a domainname too. So, the pattern returned by $RE{net}{domain} recognizes a single space as well.
       This is not always what people want. If you want to recognize domainnames, but not a space, you can do one of two things, either use

	   /(?! )$RE{net}{domain}/

       or use the "{-nospace}" option (without an argument).

REFERENCES

       RFC 1035
	   Mockapetris, P.: DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION.  November 1987.

SEE ALSO

       Regexp::Common for a general description of how to use this interface.

AUTHOR

       Damian Conway damian@conway.org.

MAINTAINANCE

       This package is maintained by Abigail (regexp-common@abigail.be).

BUGS AND IRRITATIONS

       Bound to be plenty.

       For a start, there are many common regexes missing.  Send them in to regexp-common@abigail.be.

LICENSE and COPYRIGHT
       This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.

       This module is free software, and maybe used under any of the following licenses:

	1) The Perl Artistic License.	  See the file COPYRIGHT.AL.
	2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
	3) The BSD Licence.		  See the file COPYRIGHT.BSD.
	4) The MIT Licence.		  See the file COPYRIGHT.MIT.

perl v5.16.2							    2010-02-23						    Regexp::Common::net(3)
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