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Twigils and special variables

Note! This site is about Perl 6.
If you are looking for a solution for the current production version of Perl 5, please check out the Perl 5 tutorial.

Perl 6 has a large set of special variables. In order to make it easy to differentiate them from regular variables, they are marked with a second prefix called twigil.

Regular, user defined variables have a sigil ($, @ or %) in front of them.

System variables have and additional character between the sigil and the name of the variable.

Examples:

  • $*PROGRAM_NAME relative path to the currently running Perl 6 script.
  • $*PROGRAM full path to the currently running Perl 6 cript
  • $*CWD contains a path to the current working directory.
  • $*IN is the standard input (STDIN). You can read a line using $*IN.get
  • @*INC search path for modules.
  • $*PID Process ID
  • $EXECUTABLE_NAME Relative path to the current binary. Most likely perl6
  • $EXECUTABLE Full path to perl6
  • $*TMPDIR ??

You can read more about them in S28


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Gabor Szabo
Written by Gabor Szabo

Published on 2012-01-01


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