Issue with type force PATH search
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This is Bash. The behavior is similar in fish.
$ which python
/usr/bin/python
$ alias py=python
$ type py
py is aliased to `python'
And then, running type -P py prints nothing, where as I expected to print /usr/bin/pyton in a similar fashion to what is seen below.
$ type ls
ls is aliased to `ls --color=auto'
$ type -P ls
/bin/ls
The documentation for the -P option reads
-P force a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file
that would be executed
I've confirmed that /usr/bin (the directory where python is located) is in PATH.
What is going on here?
bash fish shell-builtin
asked Apr 4 at 8:50
Git GudGit Gud
1375
add a comment |
This is Bash. The behavior is similar in fish.
$ which python
/usr/bin/python
$ alias py=python
$ type py
py is aliased to `python'
And then, running type -P py prints nothing, where as I expected to print /usr/bin/pyton in a similar fashion to what is seen below.
$ type ls
ls is aliased to `ls --color=auto'
$ type -P ls
/bin/ls
The documentation for the -P option reads
-P force a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file
that would be executed
I've confirmed that /usr/bin (the directory where python is located) is in PATH.
What is going on here?
bash fish shell-builtin
asked Apr 4 at 8:50
Git GudGit Gud
1375
add a comment |
This is Bash. The behavior is similar in fish.
$ which python
/usr/bin/python
$ alias py=python
$ type py
py is aliased to `python'
And then, running type -P py prints nothing, where as I expected to print /usr/bin/pyton in a similar fashion to what is seen below.
$ type ls
ls is aliased to `ls --color=auto'
$ type -P ls
/bin/ls
The documentation for the -P option reads
-P force a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file
that would be executed
I've confirmed that /usr/bin (the directory where python is located) is in PATH.
What is going on here?
bash fish shell-builtin
asked Apr 4 at 8:50
Git GudGit Gud
1375
This is Bash. The behavior is similar in fish.
$ which python
/usr/bin/python
$ alias py=python
$ type py
py is aliased to `python'
And then, running type -P py prints nothing, where as I expected to print /usr/bin/pyton in a similar fashion to what is seen below.
$ type ls
ls is aliased to `ls --color=auto'
$ type -P ls
/bin/ls
The documentation for the -P option reads
-P force a PATH search for each NAME, even if it is an alias,
builtin, or function, and returns the name of the disk file
that would be executed
I've confirmed that /usr/bin (the directory where python is located) is in PATH.
What is going on here?
bash fish shell-builtin
bash fish shell-builtin
asked Apr 4 at 8:50
Git GudGit Gud
1375
asked Apr 4 at 8:50
Git GudGit Gud
1375
edited Apr 4 at 9:08
Git Gud
asked Apr 4 at 8:50
Git GudGit Gud
1375
asked Apr 4 at 8:50
Git GudGit Gud
1375
asked Apr 4 at 8:50
Git GudGit Gud
1375
1375
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
This:
force a PATH search for each NAME, even if it is an alias,
does not mean that bash will expand the alias and then search for the expanded command. It means that, if there were a command foo, and also an alias foo, the type -P foo will still look for the command named foo, even though there's an alias masking it. So bash isn't expanding py in type -P py to be python, and it won't show /usr/bin/python.
answered Apr 4 at 8:55
murumuru
37.2k589164
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.NAMEis the argument totype, not an alias expansion of the argument.
– chepner
Apr 4 at 18:42
add a comment |
What’s going on is that your shell is looking for a binary named py in each directory on your PATH, and not finding any.
type -P doesn’t interpret aliases or functions; it forces the given name to be searched on the path, ignoring any other available command not of type “file” with the same name.
(There’s an added subtlety with type -p and type -P: they take hashes into account, so they will show a hashed value if one exists, without looking in the PATH. But that’s not involved here.)
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
This:
force a PATH search for each NAME, even if it is an alias,
does not mean that bash will expand the alias and then search for the expanded command. It means that, if there were a command foo, and also an alias foo, the type -P foo will still look for the command named foo, even though there's an alias masking it. So bash isn't expanding py in type -P py to be python, and it won't show /usr/bin/python.
answered Apr 4 at 8:55
murumuru
37.2k589164
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.NAMEis the argument totype, not an alias expansion of the argument.
– chepner
Apr 4 at 18:42
add a comment |
This:
force a PATH search for each NAME, even if it is an alias,
does not mean that bash will expand the alias and then search for the expanded command. It means that, if there were a command foo, and also an alias foo, the type -P foo will still look for the command named foo, even though there's an alias masking it. So bash isn't expanding py in type -P py to be python, and it won't show /usr/bin/python.
answered Apr 4 at 8:55
murumuru
37.2k589164
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.NAMEis the argument totype, not an alias expansion of the argument.
– chepner
Apr 4 at 18:42
add a comment |
This:
force a PATH search for each NAME, even if it is an alias,
does not mean that bash will expand the alias and then search for the expanded command. It means that, if there were a command foo, and also an alias foo, the type -P foo will still look for the command named foo, even though there's an alias masking it. So bash isn't expanding py in type -P py to be python, and it won't show /usr/bin/python.
answered Apr 4 at 8:55
murumuru
37.2k589164
This:
force a PATH search for each NAME, even if it is an alias,
does not mean that bash will expand the alias and then search for the expanded command. It means that, if there were a command foo, and also an alias foo, the type -P foo will still look for the command named foo, even though there's an alias masking it. So bash isn't expanding py in type -P py to be python, and it won't show /usr/bin/python.
answered Apr 4 at 8:55
murumuru
37.2k589164
answered Apr 4 at 8:55
murumuru
37.2k589164
answered Apr 4 at 8:55
murumuru
37.2k589164
answered Apr 4 at 8:55
murumuru
37.2k589164
37.2k589164
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.NAMEis the argument totype, not an alias expansion of the argument.
– chepner
Apr 4 at 18:42
add a comment |
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.NAMEis the argument totype, not an alias expansion of the argument.
– chepner
Apr 4 at 18:42
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Well, this could be clearer. Thanks.
– Git Gud
Apr 4 at 8:56
Seems clear enough.
NAME is the argument to type, not an alias expansion of the argument.– chepner
Apr 4 at 18:42
Seems clear enough.
NAME is the argument to type, not an alias expansion of the argument.– chepner
Apr 4 at 18:42
add a comment |
What’s going on is that your shell is looking for a binary named py in each directory on your PATH, and not finding any.
type -P doesn’t interpret aliases or functions; it forces the given name to be searched on the path, ignoring any other available command not of type “file” with the same name.
(There’s an added subtlety with type -p and type -P: they take hashes into account, so they will show a hashed value if one exists, without looking in the PATH. But that’s not involved here.)
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
add a comment |
What’s going on is that your shell is looking for a binary named py in each directory on your PATH, and not finding any.
type -P doesn’t interpret aliases or functions; it forces the given name to be searched on the path, ignoring any other available command not of type “file” with the same name.
(There’s an added subtlety with type -p and type -P: they take hashes into account, so they will show a hashed value if one exists, without looking in the PATH. But that’s not involved here.)
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
add a comment |
What’s going on is that your shell is looking for a binary named py in each directory on your PATH, and not finding any.
type -P doesn’t interpret aliases or functions; it forces the given name to be searched on the path, ignoring any other available command not of type “file” with the same name.
(There’s an added subtlety with type -p and type -P: they take hashes into account, so they will show a hashed value if one exists, without looking in the PATH. But that’s not involved here.)
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
What’s going on is that your shell is looking for a binary named py in each directory on your PATH, and not finding any.
type -P doesn’t interpret aliases or functions; it forces the given name to be searched on the path, ignoring any other available command not of type “file” with the same name.
(There’s an added subtlety with type -p and type -P: they take hashes into account, so they will show a hashed value if one exists, without looking in the PATH. But that’s not involved here.)
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
answered Apr 4 at 8:54
Stephen KittStephen Kitt
180k25409488
180k25409488
add a comment |
add a comment |
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