MirOS Manual: lib(3p)


lib(3p)         Perl Programmers Reference Guide          lib(3p)

NAME

     lib - manipulate @INC at compile time

SYNOPSIS

         use lib LIST;

         no lib LIST;

DESCRIPTION

     This is a small simple module which simplifies the manipula-
     tion of @INC at compile time.

     It is typically used to add extra directories to perl's
     search path so that later "use" or "require" statements will
     find modules which are not located on perl's default search
     path.

     Adding directories to @INC

     The parameters to "use lib" are added to the start of the
     perl search path. Saying

         use lib LIST;

     is almost the same as saying

         BEGIN { unshift(@INC, LIST) }

     For each directory in LIST (called $dir here) the lib module
     also checks to see if a directory called $dir/$archname/auto
     exists. If so the $dir/$archname directory is assumed to be
     a corresponding architecture specific directory and is added
     to @INC in front of $dir.

     To avoid memory leaks, all trailing duplicate entries in
     @INC are removed.

     Deleting directories from @INC

     You should normally only add directories to @INC.  If you
     need to delete directories from @INC take care to only
     delete those which you added yourself or which you are cer-
     tain are not needed by other modules in your script.  Other
     modules may have added directories which they need for
     correct operation.

     The "no lib" statement deletes all instances of each named
     directory from @INC.

     For each directory in LIST (called $dir here) the lib module
     also checks to see if a directory called $dir/$archname/auto
     exists. If so the $dir/$archname directory is assumed to be

perl v5.8.8                2005-02-05                           1

lib(3p)         Perl Programmers Reference Guide          lib(3p)

     a corresponding architecture specific directory and is also
     deleted from @INC.

     Restoring original @INC

     When the lib module is first loaded it records the current
     value of @INC in an array @lib::ORIG_INC. To restore @INC to
     that value you can say

         @INC = @lib::ORIG_INC;

CAVEATS

     In order to keep lib.pm small and simple, it only works with
     Unix filepaths.  This doesn't mean it only works on Unix,
     but non-Unix users must first translate their file paths to
     Unix conventions.

         # VMS users wanting to put [.stuff.moo] into
         # their @INC would write
         use lib 'stuff/moo';

NOTES

     In the future, this module will likely use File::Spec for
     determining paths, as it does now for Mac OS (where Unix-
     style or Mac-style paths work, and Unix-style paths are con-
     verted properly to Mac-style paths before being added to
     @INC).

SEE ALSO

     FindBin - optional module which deals with paths relative to
     the source file.

AUTHOR

     Tim Bunce, 2nd June 1995.

perl v5.8.8                2005-02-05                           2

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