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Re^2: Perl influences?

by Roy Johnson (Monsignor)
on May 05, 2005 at 20:08 UTC ( #454492=note: print w/replies, xml ) Need Help??


in reply to Re: Perl influences?
in thread Perl influences?

The directional operators to open, and the file test operators come from sh. As does file globbing.

Caution: Contents may have been coded under pressure.

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Re^3: Perl influences?
by eyepopslikeamosquito (Bishop) on May 05, 2005 at 21:51 UTC

    More stuff derived from sh:

    • # as comment character.
    • Here-docs (perl's being much more powerful).
    • Capturing command stdout with backticks, i.e. `$cmd`.
    • "$var" interpolates $var, while '$var' does not.
    • Built-in vars: $? status of last command; $$ pid; $0 program name.
    • Having separate "string" versus "numeric" operators, albeit with different names; for example, shell uses = for string equality, -eq for numeric, while perl is more logical (string variants alphabetic), == for numeric, eq for string.
    • && and || operators (ok, C has these too).
    • the tr function seems inspired by Unix tr command, with y synonym to appease sed fanatics (modern day golfers being grateful for said sed fanatics early influence:-).
    • Many other perl internal functions seem inspired from sh or Unix commands, for example: shift, chown, chmod, mkdir, eval, exit, kill, sleep, umask.

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