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.
