stdout(4) - phpMan

bzcat (1)            - decompresses files to stdout
putchar (3p)         - put a byte on a stdout stream
putwchar (3p)        - put a wide character on a stdout stream
stdout (3)           - standard I/O streams
stdin (3p)           - standard I/O streams
zipnote (1)          - write the comments in zipfile to stdout, edit comments...