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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