Ben Finney wrote:
No, because it's quite common for the PATH variable to have
'/usr/local/bin' appear *before* both of '/bin' and '/usr/bin'.
If the system has a sysadmin-installed '/usr/local/bin/python'
installed as well as the OS-installed '/usr/bin/python', then the two
shebang options the OP raised will behave differently on such a
system. This seems to be quite the point of the discussion.
Yes, and that's the reason the env form is preferred. If someone --
either the system administrator, or the user environment, or the person
executing the program on the fly -- has changed the PATH, they did it
for a reason. If /usr/local/bin is in the PATH before /usr/bin, then
that is a deliberate choice (whether system-wide or not) to prefer
executables in /usr/local/bin to those in /usr/bin, and that is being
done for a very conscious reason. Which is why the PATH exists in the
first place, and why invoking the script with env is preferable.
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