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What is meaning of double hyphen (--) in ls command [duplicate]

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This question already has an answer here:

• 
  What does “--” (double-dash) mean? (also known as “bare double dash”)
  
  4 answers
  
  

I was looking for command to print only directory names in linux. I came across this novel syntax, where we can put two hyphens adjacent without any word.

ls -ld -- */

What is the meaning of this double hyphen (--) in this command and in general in linux commands?

linux shell command

share|improve this question

edited Apr 6 at 7:00

Rui F Ribeiro

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asked Apr 6 at 6:40

pzkpzk

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marked as duplicate by muru, Kusalananda♦ linux
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Apr 6 at 7:22

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add a comment | 

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This question already has an answer here:

• 
  What does “--” (double-dash) mean? (also known as “bare double dash”)
  
  4 answers
  
  

I was looking for command to print only directory names in linux. I came across this novel syntax, where we can put two hyphens adjacent without any word.

ls -ld -- */

What is the meaning of this double hyphen (--) in this command and in general in linux commands?

linux shell command

share|improve this question

edited Apr 6 at 7:00

Rui F Ribeiro

42k1483142

asked Apr 6 at 6:40

pzkpzk

52

New contributor

pzk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Apr 6 at 7:22

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

add a comment | 

This question already has an answer here:

• 
  What does “--” (double-dash) mean? (also known as “bare double dash”)
  
  4 answers
  
  

I was looking for command to print only directory names in linux. I came across this novel syntax, where we can put two hyphens adjacent without any word.

ls -ld -- */

What is the meaning of this double hyphen (--) in this command and in general in linux commands?

linux shell command

share|improve this question

edited Apr 6 at 7:00

Rui F Ribeiro

42k1483142

asked Apr 6 at 6:40

pzkpzk

52

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pzk is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

ls -ld -- */

share|improve this question

edited Apr 6 at 7:00

Rui F Ribeiro

42k1483142

asked Apr 6 at 6:40

pzkpzk

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edited Apr 6 at 7:00

Rui F Ribeiro

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asked Apr 6 at 6:40

pzkpzk

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edited Apr 6 at 7:00

Rui F Ribeiro

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edited Apr 6 at 7:00

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asked Apr 6 at 6:40

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"--" is used to mark the end of options and thus the beginning of arguments. It tells the command to treat everything following it as arguments and not as options, even if something may look like an option. This is used in several commands, not just ls.

This prevent the command from choking on arguments (eg. filenames) that begins with a hyphen (-) or two (--), which else would cause an error (no such option) or unpredictable result (if the hyphened argument actually is a valid option), because the command would try to interpret it as an option (and not as an argument).

For example, lets say one of your arguments is a file with a newspaper article:

-No Collusion, President exclaims - Washington Post.html

A preceding "--" will prevent the "-No" from being treated as an option.

This is especially important when using jokers (*) as in your example, because you'll never know beforehand if one or more of all the files from several sub-directories may begin with a hyphen.

share|improve this answer

edited Apr 6 at 6:57

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  one or more of all the files from several sub-directories may begin with a hyphen: should not matter because they will be expanded subdirname/--foobar anyway and thus not have leading dashes?
  
  – xenoid
  Apr 6 at 7:01
  

  
  
  
  

add a comment | 

0

"--" is used to mark the end of options and thus the beginning of arguments. It tells the command to treat everything following it as arguments and not as options, even if something may look like an option. This is used in several commands, not just ls.

This prevent the command from choking on arguments (eg. filenames) that begins with a hyphen (-) or two (--), which else would cause an error (no such option) or unpredictable result (if the hyphened argument actually is a valid option), because the command would try to interpret it as an option (and not as an argument).

For example, lets say one of your arguments is a file with a newspaper article:

-No Collusion, President exclaims - Washington Post.html

A preceding "--" will prevent the "-No" from being treated as an option.

This is especially important when using jokers (*) as in your example, because you'll never know beforehand if one or more of all the files from several sub-directories may begin with a hyphen.

share|improve this answer

edited Apr 6 at 6:57

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  one or more of all the files from several sub-directories may begin with a hyphen: should not matter because they will be expanded subdirname/--foobar anyway and thus not have leading dashes?
  
  – xenoid
  Apr 6 at 7:01
  

  
  
  
  

add a comment | 

0

"--" is used to mark the end of options and thus the beginning of arguments. It tells the command to treat everything following it as arguments and not as options, even if something may look like an option. This is used in several commands, not just ls.

This prevent the command from choking on arguments (eg. filenames) that begins with a hyphen (-) or two (--), which else would cause an error (no such option) or unpredictable result (if the hyphened argument actually is a valid option), because the command would try to interpret it as an option (and not as an argument).

For example, lets say one of your arguments is a file with a newspaper article:

-No Collusion, President exclaims - Washington Post.html

A preceding "--" will prevent the "-No" from being treated as an option.

This is especially important when using jokers (*) as in your example, because you'll never know beforehand if one or more of all the files from several sub-directories may begin with a hyphen.

share|improve this answer

edited Apr 6 at 6:57

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  one or more of all the files from several sub-directories may begin with a hyphen: should not matter because they will be expanded subdirname/--foobar anyway and thus not have leading dashes?
  
  – xenoid
  Apr 6 at 7:01
  

  
  
  
  

add a comment | 

"--" is used to mark the end of options and thus the beginning of arguments. It tells the command to treat everything following it as arguments and not as options, even if something may look like an option. This is used in several commands, not just ls.

This prevent the command from choking on arguments (eg. filenames) that begins with a hyphen (-) or two (--), which else would cause an error (no such option) or unpredictable result (if the hyphened argument actually is a valid option), because the command would try to interpret it as an option (and not as an argument).

For example, lets say one of your arguments is a file with a newspaper article:

-No Collusion, President exclaims - Washington Post.html

A preceding "--" will prevent the "-No" from being treated as an option.

This is especially important when using jokers (*) as in your example, because you'll never know beforehand if one or more of all the files from several sub-directories may begin with a hyphen.

share|improve this answer

edited Apr 6 at 6:57

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

share|improve this answer

edited Apr 6 at 6:57

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845

answered Apr 6 at 6:52

Baard KopperudBaard Kopperud

4,50342845