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Home: Perl Programming Help: Frequently Asked Questions:
Why don't perl one-liners work on my DOS/Mac/VMS s



Jan 19, 2001, 12:18 PM

Post #1 of 1 (2749 views)
Why don't perl one-liners work on my DOS/Mac/VMS s Can't Post

(From the Perl FAQ)

Why don't perl one-liners work on my DOS/Mac/VMS system?

The problem is usually that the command interpreters on those systems have rather different ideas about quoting than the Unix shells under which the one-liners were created. On some systems, you may have to change single-quotes to double ones, which you must NOT do on Unix or Plan9 systems. You might also have to change a single % to a %%.

For example:

    # Unix 
perl -e 'print "Hello world\n"'

# DOS, etc.
perl -e "print \"Hello world\n\""

# Mac
print "Hello world\n"
(then Run "Myscript" or Shift-Command-R)

perl -e "print ""Hello world\n"""

The problem is that none of this is reliable: it depends on the command interpreter. Under Unix, the first two often work. Under DOS, it's entirely possible neither works. If 4DOS was the command shell, you'd probably have better luck like this:

  perl -e "print <Ctrl-x>"Hello world\n<Ctrl-x>""

Under the Mac, it depends which environment you are using. The MacPerl shell, or MPW, is much like Unix shells in its support for several quoting variants, except that it makes free use of the Mac's non-ASCII characters as control characters.

There is no general solution to all of this. It is a mess, pure and simple. Sucks to be away from Unix, huh? :-)

(Some of this answer was contributed by Kenneth Albanowski.)


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