On 12Oct2022 17:49, Paulo da Silva <p_d_a_s_i_l_v_a...@nonetnoaddress.pt> wrote:
Às 05:00 de 12/10/22, Paulo da Silva escreveu:
I think that the the suggestion of searching the PATH env seems the
best.
I just want to note that you want to not just check for existence of the
path, but that it is executable (permissionwise). You want to use `X_OK`
with the `os.access` function:
https://docs.python.org/3/library/os.html#os.access
Also notice that the `shutil` module has a `which()` function:
https://docs.python.org/3/library/shutil.html#shutil.which
Another thing that I thought of is that of the 'which', but, to avoid
the mentioned recurrent problem of not knowing where 'which' is I
would use 'type' instead.
`which` will almost always be in `/usr/bin` (or `/bin` on some systems I
suppose). But do you need to know where `which` is? If you're invoking
it instead of search `$PATH`, the normal executtion stuff itself search
`$PATH`, an will find `which` for you :-)
'type' is a bash (sh?) command.
Yeah. Bash, ksh etc have `type`. It is a builtin, shich can see if a
command word you give it is a shell alias or function or builtin or
externally executed command. As you'd imagine, an external executable
like `which` has no access to the internals of your shell, and can only
look for executables.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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