[SOLVED] Search for a pattern and if it exists change some other text on the line
Linux - NewbieThis Linux forum is for members that are new to Linux.
Just starting out and have a question?
If it is not in the man pages or the how-to's this is the place!
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
Search for a pattern and if it exists change some other text on the line
I am very new to sed and cannot seem to get my command to work. I am trying to search each line for the value 'onnection' and if it exists anywhere in the line change Abc to Xyz and write the line to a new file which is a parameter passed to the shell. My code currently looks like this
sed -n "/onnection/p" $file|sed -e "s/_Abc/_Xyz/g" $file > "$file_test1_parsed"
What am I doing wrong? It is changing all occurrences of Abc not just the lines that have connect in them.
I tried -i but I get sed: illegal option -- i
When I use the syntax suggested above sed -n '/onnection/s/Abc/Xyz/gp' $file > $newfile
all I get in newfile are the changed lines and I want newfile to contain the whole file containing the changed and unchanged lines.
sed -n "/onnection/p" $file | sed -e "s/_Abc/_Xyz/g" $file > "$file_test1_parsed"
The first sed is reading from the file, and then the second sed is also reading from the same file. The piped data between them is being ignored. Remove the "$file" argument from the second command and that should fix it.
(Although as shown you you only really need a single command.)