Introduction to Linux in HPC/Text display search

HPC.NRW
Other HPC Courses
1.	Gprof Tutorial
2.	OpenMP in Small Bites
Introduction to Linux in HPC
1.	Background and History
2.	The Command Line
3.	Directory structure
4.	Files
5.	Text display and search
6.	Users and permissions
7.	Processes
8.	The vim text editor
9.	Shell scripting
10.	Environment variables
11.	System configuration
12.	SSH Connections
13.	SSH: Graphics and File Transfer
14.	Various tips

Quiz

1. Which command can be used to append text to filename?

	command > filename
	command >> filename

2. How do I find all files containing specific text on Linux?
HINT: use grep command

Click and submit to see the answer

Exercises in Terminal (slide 65)

1. Create a file using cat (some filename) and write some text in it as below. than use grep to find and display the line number and the line with the word Alan in the file.
        the best way to predict
        the future is to invent it
        –  Alan Kay

Answer:

       $ cat > quote.txt <<"EOF" \ > the best way to predict \ > the future is to invent it
       >  - Alan Kay
       > EOF

      EOF mean end of file. Press enter to get a new line while writing text. With cat > filename you write the file content in the file quote.txt.

      Further use grep as below

       $ grep -in alan quote.txt
       3: - Alan Kay

      grep command option -
           - i to ignore case distinctions, so that characters that differ only in case match each other.
           - n for line number     

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