'''chmod''' (CHange MODe) is one of the basic [Unix] command-line tools.
It is also the name of a [TclX] command with the same functionality. 
In newer Tcl versions, one can use [file attributes] (with option 
-permissions) to set this information.

A use of the [Unix] command that is often needed is
  chmod u+x myscript.tcl
or
  chmod a+x myscript.tcl
to make the Tcl script ''myscript.tcl'' executable (for just you or 
for all users, respectively). This assumes the script contains something 
like the [exec magic] that lets the kernel figure out how to run this 
script, though.

----
The [TclX] package's version of this command is documented as follows:

    :   '''chmod''' ?'''-fileid'''? ''mode filelist''
Set  permissions  of  each  of the files in the list ''filelist'' to ''mode'', where ''mode'' is an absolute numeric mode or symbolic permissions  as  in  the  [UNIX] chmod(1) command.  To specify a ''mode'' as octal, it should be prefixed with a "0" (e.g., 0622).

If the option '''-fileid''' is specified, ''filelist'' is a list  of  open file  identifiers rather than a list of file names.  This option is not available on all Unix systems.  Use the '''[infox] have_fchmod''' command to determine if this functionality is available.

The '''chmod''' command is not available on [Windows].


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