08-12-2014
When you have a big problem, a small model of it is sometimes sufficient to find out what you need. But not
too small a model. You could also break the problem into halves, to make it simpler to deal with. Right now we either solve all of it or nothing...
You've also been confusing some terms, and I think I sense some confusion on how 'stdout' and redirection in general work, your questions may not mean what you think they do, causing confusion on both sides. Perhaps if you explained what you wanted, instead of the way you wanted to accomplish it.
Perhaps something like:
Quote:
Part 1: I have 3 programs which print <three sets of madeup lines>, of which I need <these subsets of them> as selected by <these madeup strings>, printed in <this order>. There is also a single file which looks like <these pretend contents> which must be printed in its entirety, after <those subsets>, but before <this subset>. How do I get <this exact pretend-output>, given those exact pretend-inputs?
Quote:
Part 2: Same problem, but now there are thousands of these which must be looped over. Each is in its own folder. They have <this string> in common, changing <this last part> for each folder. Additionally, <these contents> are are in <individual different folders>, but the two parts have <this string> in common if that helps you pair them up.
This is what I've been trying to get. This is sufficient to build a working scale-model of your problem, which we can code around and test.
Once we get that working, you can fill in the pretend bits with real bits and see if it still works for the larger problem.
Or you could keep hiding bits and dodging questions and hope we can guess the rest...
Last edited by Corona688; 08-12-2014 at 02:54 PM..
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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
This loop prints every value in a list together with the square and cube of the value:
set values {1 3 5 7 2 4 6 8} ;# Odd numbers first, for fun!
puts "Value Square Cube" ;# Neat-looking header
foreach x $values { ;# Now loop and print...
puts " $x [expr {$x**2}] [expr {$x**3}]"
}
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)