08-18-2008
Hi,
The variables are created from a command substitution which runs an application to describe a table structure.
What i want to do is compare the output from this application to compare the structure of two tables. The main aim is to describe the differences between the tables.
The variable thing is a bit misleading i suppose because I can just create temp files in /usr/tmp and then delete them? Is that the right place to put temp files?
Thinking about it it a bit more it would be useful to describe the new table as well as showing the differences.
so if i had two files
file1 - new table
colname:col1
coltype:col1
colsize:col1
colname:col2
coltype:col2
colsize:col2
and file2- old table
colname:col1
coltype:col1
colsize:col1
colname:col4
coltype:col4
colsize:col4
i'd like the result to be something like this:
col property file1 file2
colname col1 col1
coltype col1 col1
colsize col1 col1
colname col2 -
coltype col2 -
colsize col2 -
colname - col4
colname - col4
colsize - col4
Does this make any sense? I think it's probably an awk script?
sorry for changing the tack of the question.
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LEARN ABOUT OPENDARWIN
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)