06-25-2015
A few comments may lead you in the right direction but can't replace an in depth reading of e.g. man awk plus a lot of experimenting with samples.
Arrays don't represent files, nor do the field variables $3, $1 etc. The latter hold the single fields of the actual line read from the data stream which in turn can consist of several files. Most arrays are user defined and created on first reference.
So - the trick is to find out which file is operated on when. There's the FILENAME system variable that changes with the actual file. And - there's the NR and FNR variables. NR is the record (= line) No. in the entire stream, FNR the same but in the actual file, reset to 1 when the actual file changes. So NR==FNR only for the first file, and Scrutinizer uses this to load the A (and B) arrays. If this is no more true, we must have left the first file, and we can check if e.g. $1 (of the second file) can be found as an index into the A array, and, if yes, modify the actual line as requested.
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LEARN ABOUT REDHAT
variable
variable(n) Tcl Built-In Commands variable(n)
__________________________________________________________________________________________________________________________________________________
NAME
variable - create and initialize a namespace variable
SYNOPSIS
variable ?name value...? name ?value?
_________________________________________________________________
DESCRIPTION
This command is normally used within a namespace eval command to create one or more variables within a namespace. Each variable name is
initialized with value. The value for the last variable is optional.
If a variable name does not exist, it is created. In this case, if value is specified, it is assigned to the newly created variable. If
no value is specified, the new variable is left undefined. If the variable already exists, it is set to value if value is specified or
left unchanged if no value is given. Normally, name is unqualified (does not include the names of any containing namespaces), and the
variable is created in the current namespace. If name includes any namespace qualifiers, the variable is created in the specified names-
pace. If the variable is not defined, it will be visible to the namespace which command, but not to the info exists command.
If the variable command is executed inside a Tcl procedure, it creates local variables linked to the corresponding namespace variables (and
therefore these variables are listed by info locals.) In this way the variable command resembles the global command, although the global
command only links to variables in the global namespace. If any values are given, they are used to modify the values of the associated
namespace variables. If a namespace variable does not exist, it is created and optionally initialized.
A name argument cannot reference an element within an array. Instead, name should reference the entire array, and the initialization value
should be left off. After the variable has been declared, elements within the array can be set using ordinary set or array commands.
SEE ALSO
global(n), namespace(n), upvar(n)
KEYWORDS
global, namespace, procedure, variable
Tcl 8.0 variable(n)