Perl 根据 shebang 行派遣给其他口译员？

Question

当我不小心运行一个使用 perl 的 bash 脚本并且它......有效时，我的想法被震撼了。进一步试验，似乎 perl 读取脚本的 shebang 并发送给正确的解释器：

$ cat /tmp/ohhai.sh
#!/bin/bash
echo ohhai bash

$ perl /tmp/ohhai.sh
ohhai bash

$ cat /tmp/ohhai.py
#!/usr/bin/python2
print 'ohhai python'

$ perl /tmp/ohhai.py
ohhai python

$ cat /tmp/ohhai.groovy
#!/usr/bin/groovy
println 'ohhai groovy'

$ perl /tmp/ohhai.groovy
ohhai groovy

嗯...嗯？

为了确保我没有发疯，我尝试与其他解释器一起这样做并确认这只是一个 perl 主义：

$ python /tmp/ohhai.sh
  File "/tmp/ohhai.sh", line 2
    echo ohhai bash
             ^
SyntaxError: invalid syntax

$ ruby /tmp/ohhai.sh
ruby: no Ruby script found in input (LoadError)

$ bash /tmp/ohhai.py
/tmp/ohhai.py: line 2: print: command not found

这在某处有记录吗？ thing/old 是新东西吗？ ... 为什么？

"Swiss-Army chainsaw"确实如此。

Answer 1

这是perldoc perlrun中记载的旧东西：

If the #! line does not contain the word "perl" nor the word "indir" the program named after the #! is executed instead of the Perl interpreter. This is slightly bizarre, but it helps people on machines that don't do #!, because they can tell a program that their SHELL is /usr/bin/perl, and Perl will then dispatch the program to the correct interpreter for them.

Perl 根据 shebang 行派遣给其他口译员？

Perl dispatches to other interpreters based on shebang line?

perl

shebang