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Old 09-09-2019, 09:23 PM   #1
RandomTroll
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'tail -1 *' doesn't work


I just discovered that
Code:
tail -1 *
doesn't work. It returns
Quote:
tail: option used in invalid context -- 1
I have to use
Code:
tail -n 1 *
.
Code:
head -1 *
works. Is there a reason
Code:
tail -1 *
doesn't?
Code:
tail -1 ASpecificFile
works.
 
Old 09-09-2019, 09:41 PM   #2
Mechanikx
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When using this form

Quote:
tail -1
you're using an obsolete option and you can only give one file as an argument. If you want to pass multiple files you would have to use

Quote:
tail -n 1
https://serverfault.com/questions/13...ard-characters

Last edited by Mechanikx; 09-09-2019 at 09:54 PM. Reason: Added more info.
 
2 members found this post helpful.
Old 09-09-2019, 09:44 PM   #3
frankbell
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Code:
tail -1 [filename]
tells tail to print the last line of the specified file.

I think that, if you ask tail to print the last line of every file (*), tail just gets confused, because that's not what it's designed to do. It seems to need to be pointed at a specific file.
 
Old 09-09-2019, 11:40 PM   #4
RandomTroll
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Original Poster
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Quote:
Originally Posted by Mechanikx View Post
you're using an obsolete option
OBSOLETE! OBSOLETE! OBSOLETE! http://www.imdb.com/title/tt0734667/?ref_=fn_al_tt_1

The article to which you referred blames tail's use of parse_obsolete_option for this behavior, which no other Unix utility I know has.

Quote:
Originally Posted by frankbell View Post
if you ask tail to print the last line of every file (*), tail just gets confused, because that's not what it's designed to do. It seems to need to be pointed at a specific file.
Why doesn't any other Unix utility get confused? Why doesn't
Code:
tail -n 1 *
confuse it? Mechanikx pointed to the solution, though he has it backwards: parse_obsolete_option.
 
Old 09-10-2019, 02:06 AM   #5
pan64
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this is how it is implemented. You may try to add your own improvement if you wish.
 
  


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