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Full Discussion: check for NULL variable
Top Forums Shell Programming and Scripting check for NULL variable Post 66975 by esham on Saturday 19th of March 2005 07:46:46 AM
Old 03-19-2005
check for NULL variable

Hello

I want to check for NULL variable..

Quote:
val=
if [[-z "$val" ]]
then
echo NULL
fi

val=25
if [[ -z "$val" ]]
then
echo NOTNULL
fi
but this is not working..please help

thanks in advance
esham
 

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CamlinternalOO(3)						   OCaml library						 CamlinternalOO(3)

NAME
CamlinternalOO - Run-time support for objects and classes. Module Module CamlinternalOO Documentation Module CamlinternalOO : sig end Run-time support for objects and classes. All functions in this module are for system use only, not for the casual user. === Classes === type tag type label type table type meth type t type obj type closure val public_method_label : string -> tag val new_method : table -> label val new_variable : table -> string -> int val new_methods_variables : table -> string array -> string array -> label array val get_variable : table -> string -> int val get_variables : table -> string array -> int array val get_method_label : table -> string -> label val get_method_labels : table -> string array -> label array val get_method : table -> label -> meth val set_method : table -> label -> meth -> unit val set_methods : table -> label array -> unit val narrow : table -> string array -> string array -> string array -> unit val widen : table -> unit val add_initializer : table -> (obj -> unit) -> unit val dummy_table : table val create_table : string array -> table val init_class : table -> unit val inherits : table -> string array -> string array -> string array -> t * (table -> obj -> Obj.t) * t * obj -> bool -> Obj.t array val make_class : string array -> (table -> Obj.t -> t) -> t * (table -> Obj.t -> t) * (Obj.t -> t) * Obj.t type init_table val make_class_store : string array -> (table -> t) -> init_table -> unit val dummy_class : string * int * int -> t * (table -> Obj.t -> t) * (Obj.t -> t) * Obj.t === Objects === val copy : (< .. > as 'a) -> 'a val create_object : table -> obj val create_object_opt : obj -> table -> obj val run_initializers : obj -> table -> unit val run_initializers_opt : obj -> obj -> table -> obj val create_object_and_run_initializers : obj -> table -> obj val send : obj -> tag -> t val sendcache : obj -> tag -> t -> int -> t val sendself : obj -> label -> t val get_public_method : obj -> tag -> closure === Table cache === type tables val lookup_tables : tables -> closure array -> tables === Builtins to reduce code size === type impl = | GetConst | GetVar | GetEnv | GetMeth | SetVar | AppConst | AppVar | AppEnv | AppMeth | AppConstConst | AppConstVar | AppConstEnv | AppConstMeth | AppVarConst | AppEnvConst | AppMethConst | MethAppConst | MethAppVar | MethAppEnv | MethAppMeth | SendConst | SendVar | SendEnv | SendMeth | Closure of closure === Parameters === type params = { mutable compact_table : bool ; mutable copy_parent : bool ; mutable clean_when_copying : bool ; mutable retry_count : int ; mutable bucket_small_size : int ; } val params : params === Statistics === type stats = { classes : int ; methods : int ; inst_vars : int ; } val stats : unit -> stats OCamldoc 2014-06-09 CamlinternalOO(3)
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