-2     generate rhyming couplets from keywords

-3     generate Haiku verse from keywords

-5     generate limerick from keywords

-a     convert ASCII to ASCII

-A     disambiguate sentence structure

-b     generate bureaucratese equivalent (see -x)

-B     issue equivalent C code with bugs fixed

-c     simplify/calculate arithmetic expression(s)

-C     remove copyright notice(s)

-d     define new echo switch map

-D     delete all ownership information from system files

-e     evaluate lisp expression(s)

-E     convert ASCII to Navajo

-f     read input from file

-F     transliterate to french

-g     generate pseudo-revolutionary marxist catch-phrases

-G     prepend GNU manifesto

-h     halt system (reboot suppressed on Suns, Apollos, and VAXen, not supported on NOS-2)

-i     emulate IBM OS/VU (recursive universes not supported)

-I     emulate IBM VTOS 3.7.6 (chronosynclastic infundibulae supported with  restrictions  documented  in
       IBM VTOS Reference Manual rev 3.2.6)

-J     generate junk mail

-j     justify text (see -b option)

-k     output "echo" software tools

-K     delete privileged accounts

-l     generate legalese equivalent

-L     load echo modules

-M     generate mail

-N     send output to all reachable networks (usable with -J, -K, -h options)

-n     do not add newline to the output

-o     generate obscene text

-O     clean up dirty language

-p     decrypt and print /etc/passwd

-P     port echo to all reachable networks

-P1    oolcay itay

-q     query standard input for arguments

-r     read alternate ".echo" file on start up

-R     change root password to "RMS"

-s     suspend operating system during output (Sun and VAX BSD 4.2 only)

-S     translate to swahili

-T     emulate TCP/IP handler

-t     issue troff output

-u     issue unix philosophy essay

-v     generate reverberating echo

-V     print debugging information

-x     decrypt DES format messages (NSA secret algorithm CX 3.8, not distributed outside continental US)