stdout

PDL::PP::Dump (3pm)  - - dump pp_xxx calls to stdout
PDL::PP::Dump (3pm)  - - dump pp_xxx calls to stdout
bzcat (1)            - decompresses files to stdout
ipchains-save (8)    - save IP firewall chains to stdout
screendump (1)       - dump the contents of a virtual console to stdout
stdout (3)           - standard I/O streams