How to find lines containing a string in linux

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I have a file in Linux, I would like to display lines which contain a specific string in that file, how to do this?

search linux file string
5 Answers

Besides grep, you can also use other utilities such as awk or sed

Here is a few examples. Let say you want to search for a string is in the file named GPL.

Your sample file

$ cat -n GPL 
     1    The GNU General Public License is a free, copyleft license for
     2    The licenses for most software and other practical works are designed
     3  the GNU General Public License is intended to guarantee your freedom to
     4  GNU General Public License for most of our software;

1. grep

$ grep is GPL 
  The GNU General Public License is a free, copyleft license for
the GNU General Public License is intended to guarantee your freedom to

2. awk

$ awk /is/ GPL 
  The GNU General Public License is a free, copyleft license for
the GNU General Public License is intended to guarantee your freedom to

3. sed

$ sed -n '/is/p' GPL
  The GNU General Public License is a free, copyleft license for
the GNU General Public License is intended to guarantee your freedom to
Admin1

Write the queue job information in long format to text file

qstat -f > queue.txt

Grep job names

grep 'Job_Name' queue.txt

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