01-27-2019
Check if the file contains printable characters
grep -q "[[:print:]]" $file;
if not if ! truncated to zero >$file
I apologize for the not quite detailed answer, I just learn English
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addch(3cur) addch(3cur)
Name
addch, waddch, mvaddch, mvwaddch - add character to window
Syntax
#include <cursesX.h>
int addch(ch)
chtype ch;
int waddch(win, ch)
WINDOW *win;
chtype ch;
int mvaddch(y, x, ch)
int y, x;
chtype ch;
int mvwaddch(win, y, x, ch)
WINDOW *win;
int y, x;
chtype ch;
Description
The routine inserts the character into the default window at the current cursor position and the window cursor is advanced. The character
is of the type which is defined in the header file, as containing both data and attributes.
The routine inserts the character into the specified window at the current cursor position. The cursor position is advanced.
The routine moves the cursor to the specified (y, x) position and inserts the character into the default window. The cursor position is
advanced after the character has been inserted.
The routine moves the cursor to the specified (y, x) position and inserts the character into the specified window. The cursor position is
advanced after the character has been inserted.
All these routines are similar to The following information applies to all the routines.
If the cursor moves on to the right margin, an automatic newline is performed. If is enabled, and a character is added to the bottom right
corner of the screen, the scrolling region will be scrolled up one line. If scrolling is not allowed, ERR will be returned.
If is a tab, newline, or backspace, the cursor will be moved appropriately within the window. If is a newline, the routine is called
before the cursor is moved to the beginning of the next line. If newline mapping is off, the cursor will be moved to the next line, but
the x coordinate will be unchanged. If is a tab the cursor is moved to the next tab position within the window. If is another control
character, it will be drawn in the ^X notation. Calling the routine after adding a control character returns the representation of the
control character, not the control character.
Video attributes can be combined with a character by or-ing them into the parameter. This will result in these attributes being set. The
intent here is that text, including attributes, can be copied from one place to another using and For further information, see
The and routines are macros.
Return Values
The and functions return OK on success and ERR on error.
See Also
clrtoeol(3cur), inch(3cur), scrollok(3cur), standout(3cur), putchar(3s)
addch(3cur)