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Built-in mc macrovariables can be used not only in user menu, but also in the command line as well as in extensions menu and built-in editor user menu.
All macrovariables start with the symbol % (that means that %% should be used to represent the % character in strings where macros were used) and can be classified into three broad categories:
The most important are %f, %d and %t (for the active panel) and their counterparts for the passive panel
Here is an example of usage of %D macro variable is MC use menu:
T Copy current directory to other panel recursively tar cf - . | (cd %D && tar xvpf -)
But Midnight Commander extends this functionality in two nontrivial ways: only menu items that are applicable to the context existing on the current panel or passive panel can be selected. See MC Context Sensitive User Menu.
This idea permits to "compress" number of visible to user menu to items to the subset that
is relevant to the existing situation and omit all other items. Thus you can have a lot of items of
menu and still in most cases you (and other users) see compact uncluttered menus, because non-relevant
items will be omitted.
When accessing a user menu, or executing an extension dependent command, or running a command from the command line input, a simple macro substitution takes place. Macro substitution is also available in built-in editor.
The current file name.
The current directory name.
The current file in the unselected panel.
The directory name of the unselected panel.
The currently tagged files.
The tagged files in the unselected panel.
%u and %U
Similar to the %t and %T macros, but in addition
the files are untagged. You can use this macro only
once per menu file entry or extension file entry,
because next time there will be no tagged files.
%s and %S
The selected files: The tagged files if there are
any. Otherwise the current file.
Dropped files. In all places except in the Drop
action of the mc.ext file, this will become a null
string, in the Drop action it will be replaced with
a space separated list of files that were dropped
on the file.
This is a special macro that is used to change the
current directory to the directory specified in
front of it. This is used primarily as an inter-
face to the Virtual File System.
This macro is used to invoke the internal viewer.
This macro can be used alone, or with arguments.
If you pass any arguments to this macro, they
should be enclosed in brackets.
The arguments are: ascii to force the viewer into
ascii mode; hex to force the viewer into hex mode;
nroff to tell the viewer that it should interpret
the bold and underline sequences of nroff; unfor-
mated to tell the viewer to not interpret nroff
commands for making the text bold or underlined.
The % character
Prompt for the substitution. An input box is shown
and the text inside the braces is used as a prompt.
The macro is substituted by the text typed by the
user. The user can press ESC or F10 to cancel. This
macro doesn't work on the command line yet.
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