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Edit the file in shell script

 
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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 OSF1

lmfsetup

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

NAME

       lmfsetup - License Management Facility (LMF) registration script

SYNOPSIS

       /usr/sbin/lmfsetup [template]

DESCRIPTION

       You  use  the lmfsetup script to register data supplied by a Product Authorization Key (PAK).  The lmfsetup script prompts you for the data
       associated with each field on a PAK. Once you enter all the data, LMF makes sure you have supplied entries for  all  mandatory  fields  and
       that  the value in the Checksum field validates the license data. If all data is correct, LMF registers the PAK in the License Database. If
       any data is incorrect, LMF displays the appropriate error message and gives you an opportunity to reenter the data.

       The template argument allows you to register license data from templates in /usr/var/adm/lmf.  The templates stored in this  directory  are
       created by some software products during their installation process. When you use a template, the script prompts you to supply data for any
       empty fields in the template. If the lmfsetup script cannot find the specified template in /usr/var/adm/lmf, it searches your current work-
       ing directory.

       Use  the  lmfsetup  script when you want to register a PAK without using an editor.  Normally, you should use the lmf register command. The
       lmf register command displays a template, which includes the fields on the PAK, and invokes an editor so that you can add the license  data
       to the appropriate fields.  The lmf register command allows you to correct errors without having to reenter all the data.

SEE ALSO

       Command: lmf(8)

       Software License Management

																       lmfsetup(8)