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Where is read command?

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4

1

I wanted to find read command, so I did:

$ which read

It returns exit status 1. Why does this happen?

command-line

share|improve this question

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  read is a bash builtin, not a command on its own. Find information about read in man bash ( manpages.ubuntu.com/manpages/bionic/en/man1/bash.1.html )
  
  – waltinator
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  As stated in a comment to a previous question of you this is explained. read is built into bash. There is no exectuable for that command.
  
  – PerlDuck
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you want to know syntax details about read, you can run the command help read. See the this link for more details
  
  – sudodus
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  echo is a built-in command, but it has an executable path. @waltinator @PerlDuck
  
  – Mohammad Kholghi
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @waltinator You're right that bash's echo builtin isn't the same as the external command /bin/echo that, in Ubuntu, is provided by GNU coreutils. But both support escape sequences, and both interpret them when the -e option is passed and not otherwise. In general, on an arbitrary system with an arbitrary Bourne-style shell, one cannot be sure its echo builtin (if any!) and the external command (which is required to be present) behave in a largely similar fashion. But with bash and /bin/echo in Ubuntu and most other GNU/Linux systems, they do.
  
  – Eliah Kagan
  2 hours ago
  
  
  

  
  
  
  

 | 
show 2 more comments

4

1

I wanted to find read command, so I did:

$ which read

It returns exit status 1. Why does this happen?

command-line

share|improve this question

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  read is a bash builtin, not a command on its own. Find information about read in man bash ( manpages.ubuntu.com/manpages/bionic/en/man1/bash.1.html )
  
  – waltinator
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  As stated in a comment to a previous question of you this is explained. read is built into bash. There is no exectuable for that command.
  
  – PerlDuck
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you want to know syntax details about read, you can run the command help read. See the this link for more details
  
  – sudodus
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  echo is a built-in command, but it has an executable path. @waltinator @PerlDuck
  
  – Mohammad Kholghi
  8 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @waltinator You're right that bash's echo builtin isn't the same as the external command /bin/echo that, in Ubuntu, is provided by GNU coreutils. But both support escape sequences, and both interpret them when the -e option is passed and not otherwise. In general, on an arbitrary system with an arbitrary Bourne-style shell, one cannot be sure its echo builtin (if any!) and the external command (which is required to be present) behave in a largely similar fashion. But with bash and /bin/echo in Ubuntu and most other GNU/Linux systems, they do.
  
  – Eliah Kagan
  2 hours ago
  
  
  

  
  
  
  

 | 
show 2 more comments

I wanted to find read command, so I did:

$ which read

It returns exit status 1. Why does this happen?

command-line

share|improve this question

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

$ which read

share|improve this question

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

share|improve this question

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

asked 9 hours ago

Mohammad KholghiMohammad Kholghi

1381111 bronze badges

1 Answer
1

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oldest

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5

read is a shell builtin, not an external command. which only tells you about external commands. Assuming you're using Bash (or some other Bourne-style shell), you should typically use type or command -v instead of which.

ek@Cord:~$ type read

read is a shell builtin

type and command are themselves shell builtins and they know not just about external commands but also about keywords, builtins, aliases, and functions. which is an external command that doesn't know about those things; it only knows about external commands. Sometimes which doesn't turn up anything when you ask it about a command that you can use in your shell. Sometimes it does turn up something for a command, but it isn't the same thing that actually runs when you use the command in your shell.

ek@Cord:~$ type type command which

type is a shell builtin

command is a shell builtin

which is /usr/bin/which

In Bash, you can see all the current possible meanings for a command, in the order that they are tried, with type -a:

ek@Cord:~$ type -a read

read is a shell builtin

ek@Cord:~$ type -a echo

echo is a shell builtin

echo is /bin/echo

For more information about why you usually shouldn't use which, and what to use instead in various shells including Bash, see Why not use “which”? What to use then?

share|improve this answer

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

add a comment | 

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5

read is a shell builtin, not an external command. which only tells you about external commands. Assuming you're using Bash (or some other Bourne-style shell), you should typically use type or command -v instead of which.

ek@Cord:~$ type read

read is a shell builtin

type and command are themselves shell builtins and they know not just about external commands but also about keywords, builtins, aliases, and functions. which is an external command that doesn't know about those things; it only knows about external commands. Sometimes which doesn't turn up anything when you ask it about a command that you can use in your shell. Sometimes it does turn up something for a command, but it isn't the same thing that actually runs when you use the command in your shell.

ek@Cord:~$ type type command which

type is a shell builtin

command is a shell builtin

which is /usr/bin/which

In Bash, you can see all the current possible meanings for a command, in the order that they are tried, with type -a:

ek@Cord:~$ type -a read

read is a shell builtin

ek@Cord:~$ type -a echo

echo is a shell builtin

echo is /bin/echo

For more information about why you usually shouldn't use which, and what to use instead in various shells including Bash, see Why not use “which”? What to use then?

share|improve this answer

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

add a comment | 

5

read is a shell builtin, not an external command. which only tells you about external commands. Assuming you're using Bash (or some other Bourne-style shell), you should typically use type or command -v instead of which.

ek@Cord:~$ type read

read is a shell builtin

type and command are themselves shell builtins and they know not just about external commands but also about keywords, builtins, aliases, and functions. which is an external command that doesn't know about those things; it only knows about external commands. Sometimes which doesn't turn up anything when you ask it about a command that you can use in your shell. Sometimes it does turn up something for a command, but it isn't the same thing that actually runs when you use the command in your shell.

ek@Cord:~$ type type command which

type is a shell builtin

command is a shell builtin

which is /usr/bin/which

In Bash, you can see all the current possible meanings for a command, in the order that they are tried, with type -a:

ek@Cord:~$ type -a read

read is a shell builtin

ek@Cord:~$ type -a echo

echo is a shell builtin

echo is /bin/echo

For more information about why you usually shouldn't use which, and what to use instead in various shells including Bash, see Why not use “which”? What to use then?

share|improve this answer

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

add a comment | 

read is a shell builtin, not an external command. which only tells you about external commands. Assuming you're using Bash (or some other Bourne-style shell), you should typically use type or command -v instead of which.

ek@Cord:~$ type read

read is a shell builtin

type and command are themselves shell builtins and they know not just about external commands but also about keywords, builtins, aliases, and functions. which is an external command that doesn't know about those things; it only knows about external commands. Sometimes which doesn't turn up anything when you ask it about a command that you can use in your shell. Sometimes it does turn up something for a command, but it isn't the same thing that actually runs when you use the command in your shell.

ek@Cord:~$ type type command which

type is a shell builtin

command is a shell builtin

which is /usr/bin/which

In Bash, you can see all the current possible meanings for a command, in the order that they are tried, with type -a:

ek@Cord:~$ type -a read

read is a shell builtin

ek@Cord:~$ type -a echo

echo is a shell builtin

echo is /bin/echo

For more information about why you usually shouldn't use which, and what to use instead in various shells including Bash, see Why not use “which”? What to use then?

share|improve this answer

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

ek@Cord:~$ type read

read is a shell builtin

ek@Cord:~$ type type command which

type is a shell builtin

command is a shell builtin

which is /usr/bin/which

ek@Cord:~$ type -a read

read is a shell builtin

ek@Cord:~$ type -a echo

echo is a shell builtin

echo is /bin/echo

share|improve this answer

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges

answered 8 hours ago

Eliah KaganEliah Kagan

86k2222 gold badges240240 silver badges380380 bronze badges