ns_while(3aolserv) [debian man page]
ns_lctl(3aolserver) AOLserver Built-In Commands ns_lctl(3aolserver) __________________________________________________________________________________________________________________________________________________ NAME
ns_for, ns_foreach, ns_while, ns_lctl - Replacements for standard Tcl loop commands which enable monitoring and control SYNOPSIS
ns_for start test next body ns_foreach varname list body ns_foreach varlist1 list1 ?varlist2 list2 ...? body ns_while test body ns_lctl cancel id ns_lctl eval id script ns_lctl info id ns_lctl install command ns_lctl list ns_lctl pause id ns_lctl result id _________________________________________________________________ DESCRIPTION
The ns_for, ns_foreach, and ns_while commands are replacements for cooresponding Tcl commands with the additional capability of monitoring and control through the ns_lctl command. ns_for start test next body See the for(n) man page for usage. ns_foreach start test next body See the foreach(n) man page for usage. ns_foreach varlist1 list1 ?varlist2 list2 ...? body See the foreach(n) man page for usage. ns_while test body See the while(n) man page for usage. ns_lctl cancel id Mark the given loop to cancel at the next iteration, resulting in the loop returning with TCL_ERROR. ns_lctl eval id script ns_lctl info id ns_lctl install command ns_lctl list ns_lctl pause id ns_lctl result id SEE ALSO
for(n), foreach(n), while(n) KEYWORDS
threads, iteration, list, looping, cancel AOLserver 4.5 ns_lctl(3aolserver)
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foreach(n) Tcl Built-In Commands foreach(n) __________________________________________________________________________________________________________________________________________________ NAME
foreach - Iterate over all elements in one or more lists SYNOPSIS
foreach varname list body foreach varlist1 list1 ?varlist2 list2 ...? body _________________________________________________________________ DESCRIPTION
The foreach command implements a loop where the loop variable(s) take on values from one or more lists. In the simplest case there is one loop variable, varname, and one list, list, that is a list of values to assign to varname. The body argument is a Tcl script. For each element of list (in order from first to last), foreach assigns the contents of the element to varname as if the lindex command had been used to extract the element, then calls the Tcl interpreter to execute body. In the general case there can be more than one value list (e.g., list1 and list2), and each value list can be associated with a list of loop variables (e.g., varlist1 and varlist2). During each iteration of the loop the variables of each varlist are assigned consecutive values from the corresponding list. Values in each list are used in order from first to last, and each value is used exactly once. The total number of loop iterations is large enough to use up all the values from all the value lists. If a value list does not contain enough elements for each of its loop variables in each iteration, empty values are used for the missing elements. The break and continue statements may be invoked inside body, with the same effect as in the for command. Foreach returns an empty string. EXAMPLES
The following loop uses i and j as loop variables to iterate over pairs of elements of a single list. set x {} foreach {i j} {a b c d e f} { lappend x $j $i } # The value of x is "b a d c f e" # There are 3 iterations of the loop. The next loop uses i and j to iterate over two lists in parallel. set x {} foreach i {a b c} j {d e f g} { lappend x $i $j } # The value of x is "a d b e c f {} g" # There are 4 iterations of the loop. The two forms are combined in the following example. set x {} foreach i {a b c} {j k} {d e f g} { lappend x $i $j $k } # The value of x is "a d e b f g c {} {}" # There are 3 iterations of the loop. SEE ALSO
for(n), while(n), break(n), continue(n) KEYWORDS
foreach, iteration, list, looping Tcl foreach(n)