Stdout From Hackepedia
stdout is short for standard output. It is always descriptor number 1 in a unix program. $ ls 1> /tmp/ls.stdout This will redirect all of stdout to the file /tmp/ls.stdout [edit] UBOs Standard output is defined in /usr/include/unistd.h as a macro that is called STDOUT_FILENO and its value is 1. [edit] *BSD In BSD based OS' stdout can be represented as /dev/fd/1 or /dev/stdout. You can see more about this by typing "man 4 stdout" or "man 4 fd". [edit] Linux In Linux based OS' you will want to read the Manual pages for stdin(3) and stdio(3). This is defined in /usr/include/unistd.h