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Truncating all lines in file except for the last 20 2

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Autosys

Autosys

Programmer
Jun 1, 2004
90
GB
Hi,

Was wondering if someone knows how to truncate all the contents of a file except for say the last 20 lines in the file.

The amount of lines in the file will never be the same.

Thanks very much!

S
 
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you can do it like that:

tail -20 original_file >temp_file
mv temp_file original_file
 
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