'''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.

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