fixed | denotes text that you enter literally. |
this | means variable text, i.e. things you must fill in. |
word | is a UNIX command, alias or shell command. |
RET | denotes pressing a keyboard key. |
[ ... ] | denotes an optional part. |
US...N | letters at the right margin) describe the command category: |
U | command is part of the operating system |
P | public domain program |
L | commercial licensed or registered program |
S | command is part of the shell (command interpreter) |
F | command can be used as filter (read from STDIN, write to STDOUT) |
f | command can be used as an input filter |
A | alias or function introduced to enhance UNIX command set |
N | new command to simplify interaction with UNIX |