AT&T UNIX™PC Unix System V Users Manual - tenox

KSH ( 1) KSH ( 1)
The following exported aliases are compiled into the shell but can
be unset or redefined:
echo='print -'
false= 'let 0'
history='fc -1'
integer= 'typeset -i'
pwd= 'print - $PWD '
r='fc -e - '
true= 'let 1'
type= 'whence -v '
hash='alias -t'
Tilde Substitution.
After alias substitution is performed, each word is checked to see
if it begins with an unquoted -. If it does, then the word up to a
/ is checked to see if it matches a user name in the /etc/ passwd
file. If a match is found, the - and the matched login name are
replaced by the login directory of the matched user. This is called
a tilde substitution. If no match is found, the original text is left
unchanged. A - by itself, or in front of a /, is replaced by the
value of the HOME parameter. A - followed by a + or - is
replaced by the value of the parameter PWD and OLDPWD
respectively.
In addition, the value of each keyword parameter is checked to see
if it begins with a - or if a - appears after a :. In either of these
cases a tilde substitution is attempted.
Command Substitution. l
The standard output from a command enclosed in a pair of grave
accents ( ") may be used as part or all of a word; trailing newlines
are removed. The command substitution 'cat file' can be
replaced by the equivalent but faster '