man: added man page for 'cmd'

man/cmd.8

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+.Dd $Mdocdate$
+.Dt CMD 8
+.Os MICROSOFT WINDOWS
+.Sh NAME
+.Nm cmd
+.Nd Windows Command Prompt
+.Sh SYNOPSIS
+.Nm
+.Op Fl DQ
+.Op Fl A|U
+.Op Fl C|K Ar command
+.Op Fl E Ns = Ns Ar ON|OFF
+.Op Fl T Ns = Ns Ar fb
+.Op Fl V Ns = Ns Ar ON|OFF
+.Sh DESCRIPTION
+.Nm
+is a Linux wrapper for Windows Command Prompt. Its options are as follows:
+.Bl -tag -width Ds
+.It Fl A
+Standard outputs will be redirected in ANSI.
+.It Fl C Ar command
+Executes the specified command and exits.
+.It Fl D
+Disables autorun commands.
+.It Fl E Ns = Ns Ar ON|OFF
+Enable or disable command extensions.
+.It Fl F Ns = Ns Ar ON|OFF
+Enable or disable filename completion.
+.It Fl K Ar command
+Executes the specified command, then become interactive.
+.It Fl Q
+Disables echoing commands for non-interactive modes.
+.It Fl S
+(TODO) command string modifier?
+.It Fl T Ns = Ns Ar fb
+Output will use colors as if 'color xx' was called; the first digit sets the foreground color, and the second digit sets the background color.
+.It Fl U
+Standard outputs will be redirected in Unicode.
+.It Fl V Ns = Ns Ar ON|OFF
+Enable or disable execution-time environment variable expansion.
+.Sh BEHAVIORS
+.Ss AUTORUN
+Autorun is enabled by default, and can be disabled with the
+.Fl D
+flag. If enabled, the program will search registry variables
+.Cd HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun
+and
+.Cd HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun
+for commands at startup and execute them if present.
+.Ss COMMAND EXTENSIONS
+Command extensions are enabled by default, and can be disabled by setting
+.Fl E Ns = Ns OFF .
+Extensions can modify the following commands:
+.Pp
+.Ic DEL or Ic ERASE ,
+.Ic COLOR ,
+.Ic CD or Ic CHDIR ,
+.Ic MD or Ic MKDIR ,
+.Ic PROMPT ,
+.Ic PUSHD ,
+.Ic POPD ,
+.Ic SET ,
+.Ic SETLOCAL ,
+.Ic ENDLOCAL ,
+.Ic IF ,
+.Ic FOR ,
+.Ic CALL ,
+.Ic SHIFT ,
+.Ic GOTO ,
+.Ic START ,
+.Ic ASSOC ,
+.Ic FTYPE
+.Ss EXECUTION-TIME ENVIRONMENT VARIABLE EXPANSION
+Execution-time environment variable expansion is disabled by default, and can be enabled by setting
+.Fl V Ns = Ns OFF .
+If enabled, enclosing a variable name with '!' characters will substitute the variable's value at command execution time.
+.Ss FILENAME COMPLETION
+Filename completion is disabled by default, and can be enabled by setting
+.Fl F Ns = Ns ON .
+If enabled, Ctrl-D and Ctrl-F can be used for directory and file completion respectively.
+.Sh BUGS
+.Nm
+lacks escape characters, meaning arguments with special characters
+.Em must
+be enclosed in quotes.