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Why don’t I get any syntax errors when I execute my Python script with Perl?1个
当我不小心使用perl运行bash脚本时,我的思绪被吹了……进一步尝试,似乎perl读取脚本的shebang并发送给正确的解释器：
当我不小心使用perl运行bash脚本时,我的思绪被吹了……进一步尝试,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……哇？
为了确保我没有疯狂,我尝试与其他口译员一起做这件事,并确认这只是一个perl-ism：
$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
这是在某处记录的吗？这是一件新事物吗？ ……为什么？
确实是“瑞士军队电锯”.
解决方法
这是
perldoc perlrun中记载的旧事物：
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.