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dirname appears not to work with xargs

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1

xargs and basename work together as I would expect:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs basename

index.js

index.js

index.js

xargs and dirname, though, appear not to work together:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs dirname

usage: dirname path

I would expect

foo

bar

baz

as output. What am I missing?

I'm on Darwin 18.2.0 (macOS 10.14.3).

osx xargs dirname

share|improve this question

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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1

xargs and basename work together as I would expect:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs basename

index.js

index.js

index.js

xargs and dirname, though, appear not to work together:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs dirname

usage: dirname path

I would expect

foo

bar

baz

as output. What am I missing?

I'm on Darwin 18.2.0 (macOS 10.14.3).

osx xargs dirname

share|improve this question

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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

add a comment | 

xargs and basename work together as I would expect:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs basename

index.js

index.js

index.js

xargs and dirname, though, appear not to work together:

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs dirname

usage: dirname path

I would expect

foo

bar

baz

as output. What am I missing?

I'm on Darwin 18.2.0 (macOS 10.14.3).

osx xargs dirname

share|improve this question

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs basename

index.js

index.js

index.js

$ printf '%sn' foo/index.js bar/index.js baz/index.js | xargs dirname

usage: dirname path

foo

bar

baz

share|improve this question

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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

share|improve this question

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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

edited 1 hour ago

Jeff Schaller

42.8k1159136

edited 1 hour ago

Jeff Schaller

42.8k1159136

asked 3 hours ago

davidchambersdavidchambers

1084

New contributor

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

asked 3 hours ago

davidchambersdavidchambers

1084

2 Answers
2

active

oldest

votes

3

dirname on macOS only takes a single pathname, whereas basename is able to work with multiple pathnames. It is however safest to call basename with a single pathname so that it does not accidentally try to remove the the second pathname from the end of the first, as in

$ basename some/file e

fil

When calling these utilities from xargs you may ask xargs to run the utility with a single newline-delimited string at a time:

printf '%sn' some arguments | xargs -I {} basename {}

or,

printf '%sn' some arguments | xargs -I {} dirname {}

You could also use xargs -L 1 utility rather than xargs -I {} utility {}.

share|improve this answer

answered 3 hours ago

KusalanandaKusalananda

133k17254417

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I fundamentally misunderstood xargs. I was under the impression that its default behaviour was to execute the utility once for each input line. Thanks for correcting my understanding.
  
  – davidchambers
  15 mins ago
  

  
  
  
  

add a comment | 

1

dirname only takes 1 argument; while the GNU/coreutils version of dirname can take more than 1 argument, that is a non-standard extension:

SYNOPSIS



    dirname string

share|improve this answer

answered 3 hours ago

Uncle BillyUncle Billy

6016

add a comment | 

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3

dirname on macOS only takes a single pathname, whereas basename is able to work with multiple pathnames. It is however safest to call basename with a single pathname so that it does not accidentally try to remove the the second pathname from the end of the first, as in

$ basename some/file e

fil

When calling these utilities from xargs you may ask xargs to run the utility with a single newline-delimited string at a time:

printf '%sn' some arguments | xargs -I {} basename {}

or,

printf '%sn' some arguments | xargs -I {} dirname {}

You could also use xargs -L 1 utility rather than xargs -I {} utility {}.

share|improve this answer

answered 3 hours ago

KusalanandaKusalananda

133k17254417

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I fundamentally misunderstood xargs. I was under the impression that its default behaviour was to execute the utility once for each input line. Thanks for correcting my understanding.
  
  – davidchambers
  15 mins ago
  

  
  
  
  

add a comment | 

3

dirname on macOS only takes a single pathname, whereas basename is able to work with multiple pathnames. It is however safest to call basename with a single pathname so that it does not accidentally try to remove the the second pathname from the end of the first, as in

$ basename some/file e

fil

When calling these utilities from xargs you may ask xargs to run the utility with a single newline-delimited string at a time:

printf '%sn' some arguments | xargs -I {} basename {}

or,

printf '%sn' some arguments | xargs -I {} dirname {}

You could also use xargs -L 1 utility rather than xargs -I {} utility {}.

share|improve this answer

answered 3 hours ago

KusalanandaKusalananda

133k17254417

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I fundamentally misunderstood xargs. I was under the impression that its default behaviour was to execute the utility once for each input line. Thanks for correcting my understanding.
  
  – davidchambers
  15 mins ago
  

  
  
  
  

add a comment | 

dirname on macOS only takes a single pathname, whereas basename is able to work with multiple pathnames. It is however safest to call basename with a single pathname so that it does not accidentally try to remove the the second pathname from the end of the first, as in

$ basename some/file e

fil

When calling these utilities from xargs you may ask xargs to run the utility with a single newline-delimited string at a time:

printf '%sn' some arguments | xargs -I {} basename {}

or,

printf '%sn' some arguments | xargs -I {} dirname {}

You could also use xargs -L 1 utility rather than xargs -I {} utility {}.

share|improve this answer

answered 3 hours ago

KusalanandaKusalananda

133k17254417

$ basename some/file e

fil

printf '%sn' some arguments | xargs -I {} basename {}

printf '%sn' some arguments | xargs -I {} dirname {}

share|improve this answer

answered 3 hours ago

KusalanandaKusalananda

133k17254417

answered 3 hours ago

KusalanandaKusalananda

133k17254417

answered 3 hours ago

KusalanandaKusalananda

133k17254417

1

dirname only takes 1 argument; while the GNU/coreutils version of dirname can take more than 1 argument, that is a non-standard extension:

SYNOPSIS



    dirname string

share|improve this answer

answered 3 hours ago

Uncle BillyUncle Billy

6016

add a comment | 

1

dirname only takes 1 argument; while the GNU/coreutils version of dirname can take more than 1 argument, that is a non-standard extension:

SYNOPSIS



    dirname string

share|improve this answer

answered 3 hours ago

Uncle BillyUncle Billy

6016

add a comment | 

dirname only takes 1 argument; while the GNU/coreutils version of dirname can take more than 1 argument, that is a non-standard extension:

SYNOPSIS



    dirname string

share|improve this answer

answered 3 hours ago

Uncle BillyUncle Billy

6016

SYNOPSIS



    dirname string

share|improve this answer

answered 3 hours ago

Uncle BillyUncle Billy

6016

answered 3 hours ago

Uncle BillyUncle Billy

6016

answered 3 hours ago

Uncle BillyUncle Billy

6016