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Top Forums Shell Programming and Scripting Check if a variable has a value assigned? Post 302312841 by sumeet on Sunday 3rd of May 2009 07:36:41 PM
Old 05-03-2009
Check if a variable has a value assigned?

Hi,

I want to check if a variable has a value assigned to it or not.

I can do following -

Code:
cat $Var > File1
if [ -s File1 ]
then
      echo "$Var has value"
else
      echo "$Var is null"
fi

But I have to check for 3 Variables and I want to wrap it up in couple of unix statements.

Any suggestion is appreciated.

Thanks
Sumeet
 

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inviso_as_lib(3erl)					     Erlang Module Definition					       inviso_as_lib(3erl)

NAME
inviso_as_lib - The Inviso Autostart Utility Library DESCRIPTION
The purpose of the Inviso autostart utility library is to facilitate the creation and modification of autostart configuration files used by the standard autostart. EXPORTS
setup_autostart(Node, R, Opts, TracerData, CmdFiles, Bindings, Transl, RTtag) -> ok | {error, Reason} Types Node = atom() R = int() Opts -- see inviso:add_nodes/2,3 TracerData -- see inviso:init_tracing/1,2 CmdFiles = [CmdFile] CmdFile = string() Bindings = [{Var,Val}] Var = atom() Val = term() Transl = [{{M1,F1,Arity}, {M2,F2,{Mt,Ft}}}] M1 = F1 = M2 = F2 = Mt = Ft = atom() Arity = int() RTtag = term() Reason = term() Creates an autostart configuration file on Node . The name of the file is automatically deducted from consulting the Runtime_Tools configuration parameters at Node . R is the number of allowed autostarts remaining. Opts is the options which shall be given to the runtime component. See inviso:add_nodes/2,3 . TracerData is used when initiating tracing on this node. See inviso:init_tracing/1,2 . CmdFiles points out files containing instructions understood by the inviso_autostart_server implementation of an autostart initia- tor. Bindings is a list of {Var, Val} tuples, where Var is the name of a variable and Val the actual value of the variable. Transl means that M1:F1/Arity shall be translated into M2:F2 . RTtag is the incarnation tag of the runtime component. See See inviso:add_nodes/2,3 . set_repeat(Node, R) -> ok | {error, Reason} Types Node = atom() R = int() Reason = term() Sets the repeat parameter in the autostart file at Node without changing any of its other contents. The autostart configuration file must exist. R is the number of allowed autostarts remaining. inhibit_autostart(Node) -> ok | {error, Reason} Types Node = atom() Reason = term() Sets the repeat parameter in the autostart file at Node to 0. Equivalent to set_repeat(Node, 0) . Ericsson AB inviso 0.6.2 inviso_as_lib(3erl)
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