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Full Discussion: Noob trying to improve
Operating Systems OS X (Apple) Noob trying to improve Post 302989490 by MadeInGermany on Friday 13th of January 2017 09:02:21 AM
Old 01-13-2017
local means: the variable exists only within the current scope.
In Bash: within the current function.
Bash is not a declarative language, and has loose type binding.
For example you can add a 1 to a string "5", and get "51" or 6 dependent on the operator.
With declare -i you can limit the misuse of variables. For example
Code:
i="a"; [ $i -lt 5 ] && echo "$i is less than 5"

gives a syntax error. With declare -i i the "a" will be casted to a 0, and there will not be a syntax error (but might still result in a malfunction in the following code).
declare makes most sense for special variables like arrays.
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set(n)							       Tcl Built-In Commands							    set(n)

__________________________________________________________________________________________________________________________________________________

NAME
set - Read and write variables SYNOPSIS
set varName ?value? _________________________________________________________________ DESCRIPTION
Returns the value of variable varName. If value is specified, then set the value of varName to value, creating a new variable if one doesn't already exist, and return its value. If varName contains an open parenthesis and ends with a close parenthesis, then it refers to an array element: the characters before the first open parenthesis are the name of the array, and the characters between the parentheses are the index within the array. Otherwise varName refers to a scalar variable. Normally, varName is unqualified (does not include the names of any containing namespaces), and the variable of that name in the current namespace is read or written. If varName includes names- pace qualifiers (in the array name if it refers to an array element), the variable in the specified namespace is read or written. If no procedure is active, then varName refers to a namespace variable (global variable if the current namespace is the global namespace). If a procedure is active, then varName refers to a parameter or local variable of the procedure unless the global command was invoked to declare varName to be global, or unless a variable command was invoked to declare varName to be a namespace variable. SEE ALSO
expr(n), proc(n), trace(n), unset(n) KEYWORDS
read, write, variable Tcl set(n)
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