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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LEARN ABOUT CENTOS
camlinternaloo
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)