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isatty

Syntax

 
#include <unistd.h>

int isatty(int fd);

Description

Tells if the file descriptor refers to a terminal device or not.

Return Value

Nonzero if fd is a terminal device, zero otherwise.

Portability

ANSI/ISO C No
POSIX 1003.2-1992; 1003.1-2001

Example

 
if (isatty(1))
  fflush(stdout);


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