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Top Forums UNIX for Dummies Questions & Answers Why Do You Need the Explicit Pathname to Execute? Post 302738163 by alister on Friday 30th of November 2012 12:48:02 PM
Old 11-30-2012
Quote:
Originally Posted by Corona688
Adding a relative directory into your PATH can have problems beyond the obvious.

Many shells cache a list of available commands they find in PATH. Put a relative directory in there, and they may not always find all available commands because they don't know the cache needs to be regenerated every time you cd. Some may even crash if you put a relative directory in PATH.
I never suggested that such a thing should be done. I simply noted that with PATH set to . command lookup behaves like filename lookup (an observation which was followed by some of the disastrous consequences).

Building such a system would require auditing/rewritting all of its scripts. In the wake of such a feat, it shouldn't be too much trouble to disable the shell's caching, which in such an environment would serve no purpose.

Regards,
Alister

P.S. Corona, thanks for the icode markup fix.

Last edited by alister; 11-30-2012 at 01:58 PM..
 

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Jifty::Util(3pm)					User Contributed Perl Documentation					  Jifty::Util(3pm)

NAME
Jifty::Util - Things that don't fit anywhere else DESCRIPTION
absolute_path PATH "absolute_path" converts PATH into an absolute path, relative to the application's root (as determined by "app_root") This can be called as an object or class method. canonicalize_path PATH Takes a "path" style /foo/bar/baz and returns a canonicalized (but not necessarily absolute) version of the path. Always use "/" as the separator, even on platforms which recognizes both "/" and "" as valid separators in PATH. jifty_root Returns the root directory that Jifty has been installed into. Uses %INC to figure out where Jifty.pm is. share_root Returns the 'share' directory of the installed Jifty module. This is currently only used to store the common Mason components, CSS, and JS of Jifty and it's plugins. app_root Returns the application's root path. This is done by returning $ENV{'JIFTY_APP_ROOT'} if it exists. If not, Jifty tries searching upward from the current directory, looking for a directory which contains a "bin/jifty". Failing that, it searches upward from wherever the executable was found. It "die"s if it can only find "/usr" or "/usr/local" which fit these criteria. is_app_root PATH Returns a boolean indicating whether the path passed in is the same path as the app root. Useful if you're recursing up a directory tree and want to stop when you've hit the root. It does not attempt to handle symbolic links. default_app_name Returns the default name of the application. This is the name of the application's root directory, as defined by "app_root". make_path PATH When handed a directory, creates that directory, starting as far up the chain as necessary. (This is what 'mkdir -p' does in your shell). require PATH Uses UNIVERSAL::require to require the provided "PATH". Additionally, logs any failures at the "error" log level. try_to_require Module This method works just like "require", except that it suppresses the error message in cases where the module isn't found. already_required class Helper function to test whether a given class has already been loaded. generate_uuid Generate a new UUID using Data::UUID. reference_to_data Object Provides a saner output format for models than "MyApp::Model::Foo=HASH(0x1800568)". stringify LIST Takes a list of values and forces them into strings. Right now all it does is concatenate them to an empty string, but future versions might be more magical. AUTHOR
Various folks at Best Practical Solutions, LLC. perl v5.14.2 2010-12-08 Jifty::Util(3pm)
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