Login or Register to Ask a Question and Join Our Community

Sponsored Content
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.
 

10 More Discussions You Might Find Interesting

1. AIX

How to edit txt file by shell script?

What I want to do is just delete some lines from a text file, I know it's easy using copy and redirect function, but what I have to do is edit this file (delete the lines) directly, as new lines may be added to the text file during this period. Can AIX do this ? # cat text 1:line1 2:line2... (3 Replies)
Discussion started by: dupeng
3 Replies

2. Shell Programming and Scripting

shell script to edit the content of a file

Hi I need some help using shell script to edit a file. My original file has the following format: /txt/email/myemail.txt /txt/email/myemail2.txt /pdf/email/myemail.pdf /pdf/email/myemail2.pdf /doc/email/myemail.doc /doc/email/myemail2.doc I need to read each line. If the path is... (3 Replies)
Discussion started by: tiger99
3 Replies

3. Shell Programming and Scripting

Edit a config file using shell script

I need to edit a config file using shell script. i.e., Search with the 'key' string and edit the 'value'. For eg: below is what I have in the config file "configfile.cfg". Key1=OldValue1 Key2=OldValue2 I want to search for "Key1" and change "OldValue1" to "NewValue1" Thanks for your... (7 Replies)
Discussion started by: rajeshomallur
7 Replies

4. Shell Programming and Scripting

shell script to edit file and delete entry

Can anyone provide me a shell script to edit a xml file and delete one entry. To do manually i can edit(vi editor) the file and 'dd' will delete the file.But I wiluld to know if I can do with a script. Thanks in advance Tannu (6 Replies)
Discussion started by: tannu
6 Replies

5. Shell Programming and Scripting

How to edit particular cell of csv file using shell script

I have one csv file and in that I want update particular cell. I know the row and coloumn number for that respective. Please help me... (6 Replies)
Discussion started by: deepak_p86
6 Replies

6. Shell Programming and Scripting

Can we edit crontab using a shell script

Hi, Can some one tell me if we can configure the jobs in crontab using a shell script. I know it can be done easily by using "crontab -e", but i just want to know whether we can add a job into the crontab using a shell script. If it can be done, plz suggest the procedure to do it. If it... (6 Replies)
Discussion started by: rudrarajumk
6 Replies

7. Shell Programming and Scripting

Shell script to edit a file

Hello, I have a big file in wich I would like to rename inside this exactly the string '_ME' and not rename in case we have 'ABC_MELANGE'. Is there a way to do it by using a shell script? Any tip will be apreciated. The file is like described bellow, after using command more filename : ... (3 Replies)
Discussion started by: Titas
3 Replies

8. Shell Programming and Scripting

shell script to edit a file

i have a file called number which contains data as 1 2 3 4 5 6 7 8 9 0 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 needed a shell script to print the output as 1 7 7 1 4 and (2 Replies)
Discussion started by: jacky29
2 Replies

9. Shell Programming and Scripting

Automating using shell script : edit the file in a directory

I am trying to automate hadoop installation procedure using shell script. It involves go to perticular directory and add some more lines to the file /etc/sysctl.conf. How this can be done? Regards Navaz (1 Reply)
Discussion started by: Abdul Navaz
1 Replies

10. Shell Programming and Scripting

Open and edit a file using a shell script

Hello Folks, I have a file named as date.dat present at /tmp/abc location which has following data - 20161030,20161031,20161101 I need to remove this line and replace it with something like below - $param1,$param2,$param3 Param1, Param2 and param3 stores the date based on some calculation in... (1 Reply)
Discussion started by: ektubbe
1 Replies

LEARN ABOUT PLAN9

sysctl.conf

SYSCTL.CONF(5)                                                     File Formats                                                     SYSCTL.CONF(5)

NAME

       sysctl.conf - sysctl preload/configuration file

DESCRIPTION

       sysctl.conf is a simple file containing sysctl values to be read in and set by sysctl.  The syntax is simply as follows:

              # comment
              ; comment

              token = value

       Note  that  blank  lines  are ignored, and whitespace before and after a token or value is ignored, although a value can contain whitespace
       within.  Lines which begin with a # or ; are considered comments and ignored.

EXAMPLE

              # sysctl.conf sample
              #
                kernel.domainname = example.com
              ; this one has a space which will be written to the sysctl!
                kernel.modprobe = /sbin/mod probe

FILES

       /run/sysctl.d/*.conf
       /etc/sysctl.d/*.conf
       /usr/local/lib/sysctl.d/*.conf
       /usr/lib/sysctl.d/*.conf
       /lib/sysctl.d/*.conf
       /etc/sysctl.conf
              The paths where sysctl preload files usually exist.  See also sysctl option --system.

SEE ALSO

       sysctl(8)

AUTHOR

       George Staikos <staikos@0wned.org>

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng                                                          January 2012                                                     SYSCTL.CONF(5)
All times are GMT -4. The time now is 06:34 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy