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20

3

$ ls |sort
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm
xyz-0.0.1-1554323568.rpm

$ /bin/ls |sort
xyz-0.0.1-1554323568.rpm
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm

$ which ls
alias ls='/bin/ls --color'
 /bin/ls

Note that the sorting is different between the two commands (ls |sort results in incorrect sorting). This must be due to the color flag, but why?

linux command-line bash unix

share|improve this question

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  To sort the output of ls, in many cases, you may found useful to specify directly the -v option: ls -v . Better to avoid the deprecated and risky parsing of its output... In many modern distributions the alias of ls is directly set to /bin/ls --color=auto, as they suggest you in an answer.
  
  – Hastur
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The thing you're missing is how ANSI colour codes are signalled in a terminal. I'm not sure if it's constant or varies between terminals, but for me red can be triggered by printing 33[91m. Once you imagine the colour codes that are output by ls (normally consumed by the terminal), you can see why your sort would break (and then, the terminal strips them out so you can't see why the sort broke). I'm guessing the results were grouped by colour, then sorted by name?
  
  – Basic
  2 days ago
  
  

  
  
  
  

add a comment | 

20

3

$ ls |sort
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm
xyz-0.0.1-1554323568.rpm

$ /bin/ls |sort
xyz-0.0.1-1554323568.rpm
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm

$ which ls
alias ls='/bin/ls --color'
 /bin/ls

Note that the sorting is different between the two commands (ls |sort results in incorrect sorting). This must be due to the color flag, but why?

linux command-line bash unix

share|improve this question

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  To sort the output of ls, in many cases, you may found useful to specify directly the -v option: ls -v . Better to avoid the deprecated and risky parsing of its output... In many modern distributions the alias of ls is directly set to /bin/ls --color=auto, as they suggest you in an answer.
  
  – Hastur
  2 days ago
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  The thing you're missing is how ANSI colour codes are signalled in a terminal. I'm not sure if it's constant or varies between terminals, but for me red can be triggered by printing 33[91m. Once you imagine the colour codes that are output by ls (normally consumed by the terminal), you can see why your sort would break (and then, the terminal strips them out so you can't see why the sort broke). I'm guessing the results were grouped by colour, then sorted by name?
  
  – Basic
  2 days ago
  
  

  
  
  
  

add a comment | 

$ ls |sort
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm
xyz-0.0.1-1554323568.rpm

$ /bin/ls |sort
xyz-0.0.1-1554323568.rpm
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm

$ which ls
alias ls='/bin/ls --color'
 /bin/ls

Note that the sorting is different between the two commands (ls |sort results in incorrect sorting). This must be due to the color flag, but why?

linux command-line bash unix

share|improve this question

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

$ ls |sort
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm
xyz-0.0.1-1554323568.rpm

$ /bin/ls |sort
xyz-0.0.1-1554323568.rpm
xyz-0.0.1-1554490900.rpm
xyz-0.0.1-1554745305.rpm
xyz-0.0.1-1554751021.rpm
xyz-0.0.1-1555513460.rpm
xyz-0.0.1-1555951745.rpm

$ which ls
alias ls='/bin/ls --color'
 /bin/ls

share|improve this question

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

share|improve this question

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

asked Apr 22 at 18:31

Josh M.Josh M.

75051329

2 Answers
2

active

oldest

votes

23

Do:

/bin/ls --color > file1
/bin/ls > file2

and compare content, you'll see the difference.

Aliasing ls to /bin/ls --color=auto is likely better idea, it will stop ls from using color codes when not writing directly to terminal (like when piping to next program or writing to a file).

share|improve this answer

answered Apr 22 at 18:44

TomekTomek

62956

• 
  
  
  

  
  15
  

  
  
  
  
  
  

  
  
  @JoshM. Well, sorting should be done by ls itself, if possible. Sorting with sort is parsing, not recommended in general.
  
  – Kamil Maciorowski
  Apr 22 at 19:43
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @JoshM., rather than using /bin/ls, change your alias to what Tomak suggested and you will get the better behavior automatically.
  
  – John1024
  Apr 22 at 19:46
  

  
  
  
  


• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  @JoshM. You can also use ls for an unaliased ls or command ls for /bin/ls.
  
  – Freddy
  Apr 22 at 19:58
  
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  Yes, @Freddy, very true. But, using alias ls='/bin/ls --color' is just a recipe for trouble.
  
  – John1024
  Apr 22 at 20:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  How does this answer answer the OP's question?
  
  – pts
  yesterday
  

  
  
  
  

 | 
show 2 more comments

25

In the sorted colored output ls|sort, we can see that the last line xyz-0.0.1-1554323568.rpm is the first line
of the non-colored output. The other lines are sorted equally.

If we have at a look at the colored escape codes (non-sorted), we can see that the first
line starts with a different escape code ^[[0m. This is causing the wrong order when sorted (^[[01 before ^[[0m).

$ /bin/ls --color xyz* | cat -A
^[[0m^[[01;31mxyz-0.0.1-1554323568.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554490900.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554745305.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554751021.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555513460.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555951745.rpm^[[0m$

share|improve this answer

answered Apr 22 at 19:49

FreddyFreddy

59019

add a comment | 

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23

Do:

/bin/ls --color > file1
/bin/ls > file2

and compare content, you'll see the difference.

Aliasing ls to /bin/ls --color=auto is likely better idea, it will stop ls from using color codes when not writing directly to terminal (like when piping to next program or writing to a file).

share|improve this answer

answered Apr 22 at 18:44

TomekTomek

62956

• 
  
  
  

  
  15
  

  
  
  
  
  
  

  
  
  @JoshM. Well, sorting should be done by ls itself, if possible. Sorting with sort is parsing, not recommended in general.
  
  – Kamil Maciorowski
  Apr 22 at 19:43
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @JoshM., rather than using /bin/ls, change your alias to what Tomak suggested and you will get the better behavior automatically.
  
  – John1024
  Apr 22 at 19:46
  

  
  
  
  


• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  @JoshM. You can also use ls for an unaliased ls or command ls for /bin/ls.
  
  – Freddy
  Apr 22 at 19:58
  
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  Yes, @Freddy, very true. But, using alias ls='/bin/ls --color' is just a recipe for trouble.
  
  – John1024
  Apr 22 at 20:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  How does this answer answer the OP's question?
  
  – pts
  yesterday
  

  
  
  
  

 | 
show 2 more comments

23

Do:

/bin/ls --color > file1
/bin/ls > file2

and compare content, you'll see the difference.

Aliasing ls to /bin/ls --color=auto is likely better idea, it will stop ls from using color codes when not writing directly to terminal (like when piping to next program or writing to a file).

share|improve this answer

answered Apr 22 at 18:44

TomekTomek

62956

• 
  
  
  

  
  15
  

  
  
  
  
  
  

  
  
  @JoshM. Well, sorting should be done by ls itself, if possible. Sorting with sort is parsing, not recommended in general.
  
  – Kamil Maciorowski
  Apr 22 at 19:43
  

  
  
  
  


• 
  
  
  

  
  6
  

  
  
  
  
  
  

  
  
  @JoshM., rather than using /bin/ls, change your alias to what Tomak suggested and you will get the better behavior automatically.
  
  – John1024
  Apr 22 at 19:46
  

  
  
  
  


• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  @JoshM. You can also use ls for an unaliased ls or command ls for /bin/ls.
  
  – Freddy
  Apr 22 at 19:58
  
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  Yes, @Freddy, very true. But, using alias ls='/bin/ls --color' is just a recipe for trouble.
  
  – John1024
  Apr 22 at 20:00
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  How does this answer answer the OP's question?
  
  – pts
  yesterday
  

  
  
  
  

 | 
show 2 more comments

Do:

/bin/ls --color > file1
/bin/ls > file2

and compare content, you'll see the difference.

Aliasing ls to /bin/ls --color=auto is likely better idea, it will stop ls from using color codes when not writing directly to terminal (like when piping to next program or writing to a file).

share|improve this answer

answered Apr 22 at 18:44

TomekTomek

62956

/bin/ls --color > file1
/bin/ls > file2

share|improve this answer

answered Apr 22 at 18:44

TomekTomek

62956

answered Apr 22 at 18:44

TomekTomek

62956

answered Apr 22 at 18:44

TomekTomek

62956

25

In the sorted colored output ls|sort, we can see that the last line xyz-0.0.1-1554323568.rpm is the first line
of the non-colored output. The other lines are sorted equally.

If we have at a look at the colored escape codes (non-sorted), we can see that the first
line starts with a different escape code ^[[0m. This is causing the wrong order when sorted (^[[01 before ^[[0m).

$ /bin/ls --color xyz* | cat -A
^[[0m^[[01;31mxyz-0.0.1-1554323568.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554490900.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554745305.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554751021.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555513460.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555951745.rpm^[[0m$

share|improve this answer

answered Apr 22 at 19:49

FreddyFreddy

59019

add a comment | 

25

In the sorted colored output ls|sort, we can see that the last line xyz-0.0.1-1554323568.rpm is the first line
of the non-colored output. The other lines are sorted equally.

If we have at a look at the colored escape codes (non-sorted), we can see that the first
line starts with a different escape code ^[[0m. This is causing the wrong order when sorted (^[[01 before ^[[0m).

$ /bin/ls --color xyz* | cat -A
^[[0m^[[01;31mxyz-0.0.1-1554323568.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554490900.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554745305.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554751021.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555513460.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555951745.rpm^[[0m$

share|improve this answer

answered Apr 22 at 19:49

FreddyFreddy

59019

add a comment | 

In the sorted colored output ls|sort, we can see that the last line xyz-0.0.1-1554323568.rpm is the first line
of the non-colored output. The other lines are sorted equally.

If we have at a look at the colored escape codes (non-sorted), we can see that the first
line starts with a different escape code ^[[0m. This is causing the wrong order when sorted (^[[01 before ^[[0m).

$ /bin/ls --color xyz* | cat -A
^[[0m^[[01;31mxyz-0.0.1-1554323568.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554490900.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554745305.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554751021.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555513460.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555951745.rpm^[[0m$

share|improve this answer

answered Apr 22 at 19:49

FreddyFreddy

59019

$ /bin/ls --color xyz* | cat -A
^[[0m^[[01;31mxyz-0.0.1-1554323568.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554490900.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554745305.rpm^[[0m$
^[[01;31mxyz-0.0.1-1554751021.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555513460.rpm^[[0m$
^[[01;31mxyz-0.0.1-1555951745.rpm^[[0m$

share|improve this answer

answered Apr 22 at 19:49

FreddyFreddy

59019

answered Apr 22 at 19:49

FreddyFreddy

59019

answered Apr 22 at 19:49

FreddyFreddy

59019