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- Synopsis:
- foreach [-]<structure> <variable> { <action> }
-
- 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(5); fec(5); until(5); while(5)
-
- 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.
-
-