Why Do You Need the Explicit Pathname to Execute? Post: 302738183

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Top Forums UNIX for Dummies Questions & Answers Why Do You Need the Explicit Pathname to Execute? Post 302738183 by sudon't on Friday 30th of November 2012 01:32:17 PM

11-30-2012

Registered User

Quote:

Originally Posted by Corona688

That's a reason, but not the reason. The entire system uses PATH, not just you. This restriction gets rid of many unpredictable, unintended consequences.

OK, yes, that was very helpful. Everything that everyone was telling me is beginning to come together in my head.

Quote:

Originally Posted by alister

The open() system call, which is used to open a file for reading/writing, supports relative paths. When the path to the file does not contain any slashes, it is designed to look in the current working directory.

The exec*() family of system calls/library functions used to execute a file do not behave in this way. Some require an absolute path. Others (the ones with a p in their name), when the path provided does not contain a slash, will search only the directories in the $PATH environment variable.

Thanks, this also really helpful. But I have to ask: the ones with a 'p' in their name? I tried looking in man, but it only tells you it's a built-in. Is there a place where you can read about built-ins, system calls, or library functions?

sudon't

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LEARN ABOUT OPENSOLARIS

systemd-path

SYSTEMD-PATH(1) 						   systemd-path 						   SYSTEMD-PATH(1)

NAME

       systemd-path - List and query system and user paths

SYNOPSIS

       systemd-path [OPTIONS...] [NAME...]

DESCRIPTION

       systemd-path may be used to query system and user paths. The tool makes many of the paths described in file-hierarchy(7) available for
       querying.

       When invoked without arguments, a list of known paths and their current values is shown. When at least one argument is passed, the path
       with this name is queried and its value shown. The variables whose name begins with "search-" do not refer to individual paths, but instead
       to a list of colon-separated search paths, in their order of precedence.

OPTIONS

       The following options are understood:

       --suffix=
	   The printed paths are suffixed by the specified string.

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

SEE ALSO

       systemd(1), file-hierarchy(7)

systemd 237															   SYSTEMD-PATH(1)