The [Tcl] '''[http://www.tcl.tk/man/tcl/TclCmd/library.htm%|%library]''', a
part of the [Tcl] [The Tcl Core%|%core] distribution,  is a collection of
procedures for commonly needed functions.



** Documentation **

   [http://www.tcl.tk/man/tcl/TclCmd/library.htm%|%official reference]:   



** Commands **

   [auto_execok]:   determines whether an executable file, or shell builtin, exists

   [auto_import]:   search for and load definitions for commands matching a specified patttern 

   [auto_load]:   attempts to load the definition for a command

   [auto_mkindex]:   generates an index suitable for use by auto_load, writing it to a file name [TclIndex%|%tclIndex]

   [auto_qualify]:   computes a list of fully-qualified names for a command


   [auto_reset]:   destroys all the information cached by [auto_execok] and [auto_load]

   [parray]:   prints the names and values of the elments in an array

   [tcl_findLibrary]:   a standard search procedure used by extensions during their initialization

   [tcl_endOfWord]:   find the end of the specified word

   [tcl_startOfNextWord]:   find the start of the next word

   [tcl_startOfPreviousWord]:   find the start of the previous word

   [tcl_wordBreakAfter]:   find the beginning of word delimiter after the specified word

   [tcl_wordBreakBefore]:   find the beginning of the word delimiter before the specified word 



** Variables **

The following global variables are defined or used by the procedures in the Tcl
library.


   `auto_execs`:   an [array] containing the names of commands that could not be located by `[auto_execok]`

   `[auto_index]`:   an array of names of commands known to `[auto_load]`

   `[auto_noexec]`:   If this variable is defined, `[unknown]` will not attempt to `[exec]` any unknown commands.

   `auto_noload`:   If this variable is defined, `[unknown]` will not attempt to `[auto_load]` any commands

   `[auto_path]`:   a [list] of directories that `[package unknown]` searches to find `[package]` packages.  The initial value of this  variable aggregated from the value of the following sources, in order: `[TCLLIBPATH%|%$env(TCLLIBPAHT)]`, `[tclvars%|%$tcl_library]`, the parent directory of `[tclvars%|%$tcl_library]`, and `[tcl_pkgPath%|%$tcl_pkgPath]`.

   `[tclvars%|%$env(TCL_LIBRARY)]`:   

   `[TCLLIBPATH%|%$env(TCLLIBPATH)]`:   

   [tcl_wordchars%|%tcl_wordchars and tcl_nonwordchars]:   Used by `$tcl_endOfWord`, `tcl_startOfNextWord`, `tcl_startOfPreviousWord`, `tcl_wordBreakAfter`, and `tcl_wordBreakBefore` commands.  By default, these variables are not defined and the following rules apply:  Under [Unix], word characters are numbers, letters, and underscores ; under [Microsoft Windows%|%Windows], word characters are every character except space, tab, and newline.



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