foreach
Synopsis:
foreach [-] <structure> <variable>
Description:
The foreach command is a loop type that iterates through the items in
a variable (or alias, see below) structure. This is often useful for purging
an entire structure, or for searching through it for a certain piece of data.
Variables in the action field are normally not expanded until actual execution
of the action. They can be forced to expand early by quoting the opening curly
brace with a backslash: \{
If a hyphen (-) is prepended to the structure name, the foreach loop
will try to iterate through an alias structure instead of a variable structure.
This is primarily useful for purging alias structures.
Examples:
Simple usage of foreach, assuming $blah is a structure two levels
deep:
foreach blah xx {
..foreach blah.${xx} yy {
....echo $blah[$xx] [$yy]
..}
}
To purge an alias structure
called booya:
foreach -booya xx {
..alias -booya[$xx]
}
See Also:
fe,
fec
while, until
Restrictions:
Structures may be referenced as either $var.${subvar}.${subvar} or $var
[$subvar] [$subvar] (with any number structure levels, of course). The notation
$var.$subvar.$subvar parses as $var [${subvar.$subvar}], which
of course is incorrect, and should not be used.
Other Notes:
The action portion does not necessarily need to do anything, though there isn't
much point in using the command without it.