Beefy Boxes and Bandwidth Generously Provided by pair Networks
There's more than one way to do things
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

The code is from the file hpoj (no extension), which is installed as part of the hpoj-0.90-14 RPM for RedHat Linux 9. It's 1339 lines long, but here are lines one through six: unchanged...

#!/usr/bin/perl # LANG=C is a work around for bug 82652. # The easier work-around of setting LANG=C in perl script itself didn' +t # work. It's probably too late by then. eval '(exit $?0)' && eval 'exec env LANG=C $0 ${1+"$@"}' if $ENV{"LANG"} != "C";

Really?! No one is familiar with exec and eval?

eval "evaluates" perl code or an expression and exec terminates the currently running Perl script and executes it's arguments in the current shell, ie: without creating a new process ID.

There is no eval command in Bash, but the exec command does work in a similar fashion, executing it's arguments without creating a new process.

I think both execs are actually based on a similar function in the standard programming library for Unix-like operating systems.

--
-- GhodMode

In reply to Re: Re: understanding eval in HPOJ by GhodMode
in thread understanding eval in HPOJ by GhodMode

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others examining the Monastery: (5)
As of 2024-03-28 19:38 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found