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Re^9: Running perl from java

by ELISHEVA (Prior)
on Jan 09, 2011 at 15:43 UTC ( #881360=note: print w/replies, xml ) Need Help??

in reply to Re^8: Running perl from java
in thread Running perl from java

Anonymous monk seems to be spot on about this being a command line argument problem, though it extends beyond just quoting. One of the links above discusses how on MsWin platforms Java takes all of the elements of String[] args and concatinates them into a single string before passing them onto the exe file. It is then up to the exe to decide how it wants to split that single string back into arguments. See (this is one of the links in a reply above, but I thought I'd make it more explicit).

This is going to make it quite difficult to pass one liners to perl via -e. As a work around, if you are dead set on running short sequences of Perl commands without a script, you could have a script whose sole purpose was to take arguments and combine them into valid Perl code. The following script takes raw command line arguments and assumes that they are Perl tokens. Also if you continue to have problems with quote characters you can use qq{....} instead of double quote characters.

# put shebang needed for system here, i.e. call to ratlperl use strict; use warnings; # assume each command line argument is a Perl token eval join(' ', @ARGV);

If the above script was called "", then you would call cqperl  print qq{Hello World\\n}. Even if this is broken into arguments at every whitespace, it will still recombine into a valid command by the time it gets passed to eval

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[stevieb]: choroba my GPS home device is done, at least prototype v1 is. I'm just making sure all of my code does what it says now
[stevieb]: I test/prototype code on my Pi, then I migrate it over to Arduino when it's ready (if that's a better platform for what I'm doing). The whole RPi stuff was for learning at first, then it snowballed. I'm just trying to get my in-house CI...
[stevieb]: ...done, which obviously requires a specific hardware setup.
[stevieb]: I don't write tests for the lower-level distributions (ie. ICs, sensors etc) within those distributions, I have all tests in a master distribution which encompasess all of the sub-modules

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