09-05-2011
Setting a permanent global variable in unix accessible from any script
Is there anyway in which i can set a permanent global variable in unix, which when initialised with a value and modified during any shell script, would retain its value even if i logout and login
I dont know whether i am being able to express my need clearly but basically what i want is a variable that can be accessed from one script,it may be incremented decremented etc and that the variable would hold its modified value even if i logout and then login and execute the script again
For example if i have a variable x initialised to 10, then if i do x=`expr $x + 1` in one script and then logout and login again, the value of x should be 11
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global(n) Tcl Built-In Commands global(n)
__________________________________________________________________________________________________________________________________________________
NAME
global - Access global variables
SYNOPSIS
global varname ?varname ...?
_________________________________________________________________
DESCRIPTION
This command has no effect unless executed in the context of a proc body. If the global command is executed in the context of a proc body,
it creates local variables linked to the corresponding global variables (though these linked variables, like those created by upvar, are
not included in the list returned by info locals).
If varname contains namespace qualifiers, the local variable's name is the unqualified name of the global variable, as determined by the
namespace tail command.
varname is always treated as the name of a variable, not an array element. An error is returned if the name looks like an array element,
such as a(b).
EXAMPLES
This procedure sets the namespace variable ::a::x
proc reset {} {
global a::x
set x 0
}
This procedure accumulates the strings passed to it in a global buffer, separated by newlines. It is useful for situations when you want
to build a message piece-by-piece (as if with puts) but send that full message in a single piece (e.g. over a connection opened with socket
or as part of a counted HTTP response).
proc accum {string} {
global accumulator
append accumulator $string
}
SEE ALSO
namespace(n), upvar(n), variable(n)
KEYWORDS
global, namespace, procedure, variable
Tcl global(n)