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unix commands

could you please explain in as much depth the source and tail. any help is appreciated.
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tripled
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tripled
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rbrCommented:
tail writes the last line of a file to your stdout. You can set how much lines counted from the end of your file are printed on stdout.

tail -20 filename prints the last 20 lines of filename.

source filename sends the file to the internal script prcessor. So all commands written in the file filename will be executed in your shell.
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