09-10-2008
cat > file_to_be_emptied
ctrl-D
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Maybe it's an stupid question but remeber... I'm Junior..
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Hi ,
I am importing some table from /dev/null i dont understand what is /dev/null
Sorry i am new to UNIX
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Hi,
Q1-What does
nroff -ms > /dev/null
Q2- What does mean -A under STAT column :
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UTIL PID %CPU %MEM SZ RSS TTY STAT STIME TIME COMMAND
root 516 93,0 0,0 12 12 - A 04 nov 3906:51 wait
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hello all,
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will any one please explain why we are using this.
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Hi expert,
May I know what is the difference between below cron tab entry ?
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Hello,
I'm trying to send the error output of a 'cat' operation to /dev/null like this:
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How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&"
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I apologize if this question has been answered else where or is too elementary.
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LEARN ABOUT DEBIAN
readkey
readkey(3alleg4) Allegro manual readkey(3alleg4)
NAME
readkey - Returns the next character from the keyboard buffer. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
int readkey();
DESCRIPTION
Returns the next character from the keyboard buffer, in ASCII format. If the buffer is empty, it waits until a key is pressed. You can see
if there are queued keypresses with keypressed().
The low byte of the return value contains the ASCII code of the key, and the high byte the scancode. The scancode remains the same whatever
the state of the shift, ctrl and alt keys, while the ASCII code is affected by shift and ctrl in the normal way (shift changes case,
ctrl+letter gives the position of that letter in the alphabet, eg. ctrl+A = 1, ctrl+B = 2, etc). Pressing alt+key returns only the scan-
code, with a zero ASCII code in the low byte. For example:
int val;
...
val = readkey();
if ((val & 0xff) == 'd') /* by ASCII code */
allegro_message("You pressed 'd'
");
if ((val >> 8) == KEY_SPACE) /* by scancode */
allegro_message("You pressed Space
");
if ((val & 0xff) == 3) /* ctrl+letter */
allegro_message("You pressed Control+C
");
if (val == (KEY_X << 8)) /* alt+letter */
allegro_message("You pressed Alt+X
");
This function cannot return character values greater than 255. If you need to read Unicode input, use ureadkey() instead.
SEE ALSO
install_keyboard(3alleg4), ureadkey(3alleg4), keypressed(3alleg4), clear_keybuf(3alleg4), simulate_keypress(3alleg4)
Allegro version 4.4.2 readkey(3alleg4)