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| | <youtube width="600" height="400" right>IfD9IPixgpo</youtube> | | <youtube width="600" height="400" right>IfD9IPixgpo</youtube> |
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| − | [https://git-ce.rwth-aachen.de/hpc.nrw/ap2/tutorials/linux/-/blob/master/Slides/Linux_Intro/Linux_Intro.pdf Linux Introduction] Slides 58 - 64 (7 pages)
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| − | === Slide Layout === <!--T:5-->
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| − | page 1:
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| − | grep command and syntax
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| − | important options: -r, -i and -I
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| − | page 2:
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| − | many commands to display text
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| − | cat
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| − | less
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| − | head and tail
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| − | page 3: 40 sec
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| − | console has three streams
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| − | stdin
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| − | stdout
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| − | stderr
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| − | page 4:
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| − | stream in computing terms
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| − | similar to streaming video
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| − | input/output stream in console
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| − | page 5:
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| − | input/output streams can be redirected
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| − | redirect stdout
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| − | redirect stdin
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| − | pipe
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| − | page 6:
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| − | stream append redirection
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| − | numbered streams: 0 for stdin, 1 for stdout, 2 for stderr
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| − | page 7:
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| − | use grep to search piped output text
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| − | {{Warning|mode=info|text= '''no tips in this section'''}}
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| − | {{Warning|mode=warn|text= '''no warnings in this section'''}}
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| | === Exercises in Terminal (slide 65) === <!--T:5--> | | === Exercises in Terminal (slide 65) === <!--T:5--> |
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Revision as of 11:18, 5 October 2020
Video
Quiz
Collapse1. Which command can be used to append text to filename?
Collapse2. How do I find all files containing specific text on Linux?
HINT: use grep command
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
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$ 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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