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Where is read command?

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3

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 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 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
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @sudodus Thanks!
  
  – Mohammad Kholghi
  7 hours ago
  

  
  
  
  

 | 
show 2 more comments

3

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 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 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
  7 hours ago
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

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

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @sudodus Thanks!
  
  – Mohammad Kholghi
  7 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 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 bronze badges

$ which read

share|improve this question

asked 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 bronze badges

share|improve this question

asked 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 bronze badges

asked 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 bronze badges

asked 8 hours ago

Mohammad KholghiMohammad Kholghi

1331111 bronze badges

1 Answer
1

active

oldest

votes

4

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

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4

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 | 

4

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