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

KSH ( 1) KSH(l)
{ list ; } List is simply executed. Note that { is a keyword and
requires a blank in order to be recognized.
function identifier { list ; }
identifier ( ) { list ; }
Define a function which is referenced by identifier. The
body of the function is the list of commands between {
and } (see Functions below).
time pipeline
The pipeline is executed and the elapsed time as well as
the user and system time are printed on standard error.
The following keywords are only recognized as the first word of a
command and when not quoted:
if then �lse elif fi case esac for while until do done {
} function select time
Comments.
A word beginning with # causes that word and all the following
characters up to a new-line to be ignored.
Ali asing .
The first word of each command is replaced by the text of an
alias if an alias for this word has been defined. The first character
of an alias name can be any printable character, but the rest
of the characters must be the same as for a valid identifier. The
replacement string can contain any valid Korn Shell script including
the metacharacters listed above. The first word of each command
of the replaced text will not be tested for additional aliases.
Aliases can be used to redefine special built-in commands but cannot
be used to redefine the keywords listed above. Aliases can be
created, listed, and exported with the alias command and can be
removed with the unalias command. Exported aliases remain in
effect for sub-shells but must be reinitialized for separate invocations
of the Korn Shell (see Invocation below).
Aliasing is performed when scripts are read, not while they are
executed. Therefore, for an alias to take effect the alias command
has to be executed before the command which references the alias
is read.
Aliases are frequently used as a shorthand for full path names.
An option to the aliasing facility allows the value of the alias to be
automatically set to the full pathname of the corresponding command.
These aliases are called tracked aliases. The value of a
tracked alias is defined the first time the identifier is read and
becomes undefined each time the PATH variable is reset. These
aliases remain tracked so that the next subsequent reference will
redefine the value. Several tracked aliases are compiled into the
shell. The -h option of the set command makes each command
name which is an identifier into a tracked alias.
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