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In a perl script, is there anyway to determine the following:

1) Was the script started via 'perl script.pl' or 'script.pl' using the she-bang line?

Is not much relevant. You could use head -1 myscript and see what is it the first line, and use ls -lh myscript to see if is executable. if both you could suspect that the script was launched as "./myscript", but the "perl myscript" form is also possible. If myscript is not executable or the shebang line is missing, you need to run this as "perl myscript"

Your answer is perhaps in bash history

2) Can I determine what options were passed to 'perl' for the former or what options were on the she-bang line for the latter?

mmh, only in bash history for the former, just looking at the shebang line for the latter. If you want to pick up this info from now on in a perl script you could put something like this in your script

print OUTFILE_LOG "Running as: ", $0," ",$ARGV[0]," ",$ARGV[1]," ",$ARGV[2]; #... etc

In reply to Re: perl vs she-bang perl by pvaldes
in thread perl vs she-bang perl by mpersico

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    [davido]: or on ubuntu /var/run/utmp
    [Corion]: Otherwise, I would imagine that a user with a process still alive would lock that information in memory.
    [davido]: so last -f /var/run/utmp on ubuntu provides similar (though more verbose) info
    [oiskuu]: glibc getlogin just does ttyname() and falls back on getutline(); it's not security related at all. (reminds me of sendmail and remote finger services of the naive early spam era)
    [Corion]: But yes, "who started this process" is interesting information :)
    [tye]: no, I really believe that "login user" was added as a fundamental bit of info about each process in order to enhance the usefulness of auditing
    [Corion]: Ah - if that information is saved in a file, then you could theoretically spam that file and confuse getlogin(). So, don't use it for authentication :)
    [tye]: that is what getlogin() certainly *used* to do. I don't believe that is what it certainly should do.
    [davido]: /var/run/utmp is 664 i think.
    [tye]: Note that my "man getlogin" says that it uses stdin when it should use /dev/tty (calling a glibc bug). But that does not appear to be the case when I test it. But maybe Perl's getlogin() is not using glibc's getlogin().

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