ISATTY(3) Linux Programmer's Manual ISATTY(3) NAME isatty - does this descriptor refer to a terminal SYNOPSIS #include <unistd.h> int isatty(int desc); DESCRIPTION returns 1 if desc is an open descriptor connected to a terminal and 0 else. CONFORMING TO SVID, AT&T, X/OPEN, BSD 4.3 SEE ALSO fstat(2), ttyname(3) Linux 1995-04-20 ISATTY(3)