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Full Discussion: Edit the file in shell script
Homework and Emergencies Homework & Coursework Questions Edit the file in shell script Post 302898028 by methyl on Thursday 17th of April 2014 09:40:45 PM
Old 04-17-2014
Assuming that I have read the question correctly.

One solution would be to create a file called say /etc/sysctl.conf.append with "vi" or editor of the day, containing ONLY the new lines.

Then append the new lines to the old file using good old "cat".

cat /etc/sysctl.conf.append >> /etc/sysctl.conf

In the commercial world we would save the old version of the file (and it's permissions) before changing it. For example:

cp -p /etc/sysctl.conf /etc/sysctl.conf.180414

---------- Post updated at 02:40 ---------- Previous update was at 02:35 ----------

If we go one step further it is possible to automate the entire process by creating the "append" file in the shell script.

Code:
echo "line 1" > /etc/sysctl.conf.append
echo "line 2" >> /etc/sysctl.conf.append
echo "line 3" >> /etc/sysctl.conf.append

As we know nothing about your computer or its Operating System or Shell, this is a generic answer. In some shells the "echo" needs replacing.
 

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LEARN ABOUT X11R4

systemd-sysctl.service

SYSTEMD-SYSCTL.SERVICE(8)				      systemd-sysctl.service					 SYSTEMD-SYSCTL.SERVICE(8)

NAME

       systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot

SYNOPSIS

       /lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...]

       systemd-sysctl.service

DESCRIPTION

       systemd-sysctl.service is an early boot service that configures sysctl(8) kernel parameters by invoking /lib/systemd/systemd-sysctl.

       When invoked with no arguments, /lib/systemd/systemd-sysctl applies all directives from configuration files listed in sysctl.d(5). If one
       or more filenames are passed on the command line, only the directives in these files are applied.

       In addition, --prefix= option may be used to limit which sysctl settings are applied.

       See sysctl.d(5) for information about the configuration of sysctl settings. After sysctl configuration is changed on disk, it must be
       written to the files in /proc/sys before it takes effect. It is possible to update specific settings, or simply to reload all
       configuration, see Examples below.

OPTIONS

       --prefix=
	   Only apply rules with the specified prefix.

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

EXAMPLES

       Example 1. Reset all sysctl settings

	   systemctl restart systemd-sysctl

       Example 2. View coredump handler configuration

	   # sysctl kernel.core_pattern
	   kernel.core_pattern = |/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I

       Example 3. Update coredump handler configuration

	   # /lib/systemd/systemd-sysctl --prefix kernel.core_pattern

       This searches all the directories listed in sysctl.d(5) for configuration files and writes /proc/sys/kernel/core_pattern.

       Example 4. Update coredump handler configuration according to a specific file

	   # /lib/systemd/systemd-sysctl 50-coredump.conf

       This applies all the settings found in 50-coredump.conf. Either /etc/sysctl.d/50-coredump.conf, or /run/sysctl.d/50-coredump.conf, or
       /usr/lib/sysctl.d/50-coredump.conf will be used, in the order of preference.

       See sysctl(8) for various ways to directly apply sysctl settings.

SEE ALSO

       systemd(1), sysctl.d(5), sysctl(8),

systemd 237														 SYSTEMD-SYSCTL.SERVICE(8)
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