Say I want to go to the 80th last line of my file celery.log, but I don't know how many lines it has.
The equivalent of the tail command but go to the 80th line from the end instead of the default.
How would I do this?
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2What do you mean by "go to"? – Kusalananda May 08 '18 at 07:26
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The equivilant of `tail` command but go to the 80th last line instead of the default. – Zorgan May 08 '18 at 07:27
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4like `tail -n80 celery.log` ? – z.h. May 08 '18 at 07:29
3 Answers
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echo '$-79p' | ed -s celery.log
This would run the ed script $-79p on the file called celery.log, which would display the line that is 79 lines up from the last line of the file.
In a shell that understands here-strings:
ed -s celery.log <<<'$-79p'
If the file has less than 80 lines, ed will return an error (the character ? on its standard error stream) and produce no output on the standard output stream.
Kusalananda
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tail -n 80 celery.log | head -n 1
This will show the first of the last 80 lines (if the file has fewer than 80 lines, it will show the first line of the file).
Stéphane Chazelas
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Kyrie001
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