Introduction to Linux in HPC/Text display search

This part of the tutorial introduces the text input and output of the Linux console as well as common text based operations. It explains how different types of in- and output can be handled as well as different ways of text based console commands, their usage and their differences.

Video

( Slides as pdf)

Quiz

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

	command > filename
	command >> filename

2. Which is the correct way to redirect stdout and stderr to the same file?

	command > filename
	command 2> filename
	command | filename
	command > filename 2>&1

3. 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

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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