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Top Forums UNIX for Dummies Questions & Answers Check the value of a string variable Post 302391673 by dpc.ucore.info on Tuesday 2nd of February 2010 06:41:54 AM
Old 02-02-2010
Just use it with or without exclamation mark. It's just a negation.
 

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mark(3MENU)															       mark(3MENU)

NAME
mark - get and set the menu mark string SYNOPSIS
#include <menu.h> int set_menu_mark(MENU *menu, const char *mark); const char *menu_mark(const MENU *menu); DESCRIPTION
In order to make menu selections visible on older terminals without highlighting or color capability, the menu library marks selected items in a menu with a prefix string. The function set_menu_mark sets the mark string for the given menu. Calling set_menu_mark with a null menu item will abolish the mark string. Note that changing the length of the mark string for a menu while the menu is posted is likely to produce unhelpful behavior. The default string is "-" (a dash). Calling set_menu_mark with a non-NULL menu argument will change this default. The function menu_mark returns the menu's mark string (or NULL if there is none). RETURN VALUE
The function menu_mark returns a pointer (which may be NULL). It does not set errno. The function set_menu_mark may return the following error codes: E_OK The routine succeeded. E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument. E_SYSTEM_ERROR System error occurred (see errno). SEE ALSO
ncurses(3NCURSES), menu(3MENU). NOTES
The header file <menu.h> automatically includes the header file <curses.h>. PORTABILITY
These routines emulate the System V menu library. They were not supported on Version 7 or BSD versions. AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond. mark(3MENU)
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