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add useful commands
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@ -127,4 +127,16 @@ foo ()
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# Calling your function
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foo "My name is" $NAME
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# There are a lot of useful commands you should learn:
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tail -n 10 file.txt
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# prints last 10 lines of file.txt
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head -n 10 file.txt
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# prints first 10 lines of file.txt
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sort file.txt
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# sort file.txt's lines
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uniq -d file.txt
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# report or omit repeated lines, with -d it reports them
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cut -d ',' -f 1 file.txt
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# prints only the first column before the ',' character
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```
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