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Full Discussion: Replacing settings in config files.
Top Forums UNIX for Beginners Questions & Answers Replacing settings in config files. Post 303008138 by MadeInGermany on Monday 27th of November 2017 05:03:40 PM
Old 11-27-2017
With shell builtins (no external command awk, sed, perl)
here is a standard procedure
Code:
fn="file.conf"
# split on =, change the certain value, write to .new file:
while IFS="=" read key val
do
  case $key in
  "Another Setting") val=27;;
  esac
  printf "%s\n" "$key=$val"
done < $fn > $fn.new
# If successful
if [ $? -eq 0 ]
then
  # copy back to the original file; if successful delete the .new file
  cp $fn.new $fn &&
  rm $fn.new
fi

 

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LEARN ABOUT DEBIAN

updatejail

JAILER(8)						      System Manager's Manual							 JAILER(8)

NAME

       updatejail - is a script for rebuilding a chrooted environment made with jailer

SYNOPSIS

       updatejail <config.file> <jail identifier>

DESCRIPTION

       updatejail is a script which wipes out a chroot environment and rebuilds it. By default it leaves the /dev/log device in the chroot, so you
       do not need to restart system logger after updating a jail.

WARNING

       Do not configure your daemon inside your jail, because updatejail script will wipe out all the data inside the jail. If you would  like	to
       change  any  setting inside the jail, make the changes in the original location and then run updatejail . This makes it possible to place a
       jail even to a ramdisk.

Options
       <config.file>
	      The configuration file which contains the settings of the new chrooted environment.  For further information see man 8 jailer.conf

       <jail identifier>
	      The identifier which specifies which jail will be used. Identifiers need to be defined at jailer.conf . This identifier has to match
	      the directory name used in the Root location.

BUGS

       updatejail will not parse the configuration file and determine the Root location by itself.

       For  updatejail	to  work the Root location for the jail identifier has to end with the name of the identifier itself. For example, if your
       identifier is apache the Root location  in jailer.conf has to be something like /chroots/apache.

SEE ALSO

       updatejail(8) jailer.conf(5),

AUTHOR

       This manual page was written by Peter Holtzl <peter.holtzl@balabit.hu>.

								 December 4, 2001							 JAILER(8)
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