08-31-2014
The "let" command originated in ksh. Dave Korn considered it to be a mistake and very quickly developed the double parentheses notation to replace it. By the mid 1980's the advice was to not use the "let" command in new code. However the let command is still available. It is intended for legacy code. bash copied ksh arithmetic including both the double parentheses and the "let" command. And the bash team followed Dave's lead in not recommending the "let" command.
I started using ksh in the late 80's. The "let" command had been deprecated for several years even back then. I have been writing ksh scripts form over a quarter of a century. I don't believe that I have ever used "let". I don't believe that I ever will.
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LEARN ABOUT DEBIAN
corosync-objctl
COROSYNC-OBJCTL(8) System Manager's Manual COROSYNC-OBJCTL(8)
NAME
corosync-objctl - Configure objects in the Object Database
SYNOPSIS
corosync-objctl [-b] [-c|-w|-d|-a|-t-h] <OBJECT-SPEC>...
DESCRIPTION
corosync-objctl is used to configure objects within the object database at runtime.
OBJECT-SPEC
There are two types of entities
Objects and Key=Value pairs
Objects
Objects are container like entities that can hold other entities. They are specified as "objectA"."objectB". An example is log-
ging.logger.
Key=Value pairs
These are the entities that actually hold values (read database "fields"). They are specified as object.key=value or just
object.key if you are reading.
OPTIONS
-c Create a new object.
-d Delete an existing object.
-w Use this option when you want to write a new value to a key.
-a Display all values currently available.
-t Track changes to an object and it's children. As changes are made to the object they are printed out. this is kind of like a "tail
-f" for the object database.
-h Print basic usage.
-b Display binary values in BASH backslash escape sequences format.
EXAMPLES
Print the objOne object (shouldn't exist yet).
$ corosync-objctl objOne
Create the objOne object.
$ corosync-objctl -c objOne
Print the objOne object (empty).
$ corosync-objctl objOne
objOne
Write two new keys to the objOne object.
$ corosync-objctl -w objOne.max=3000 objOne.min=100
Print the objOne object (with the two new keys).
$ corosync-objctl objOne
objOne.min=100
objOne.max=3000
Delete the objOne.min key
$ corosync-objctl -d objOne.min=100
Prove that is gone.
$ corosync-objctl objOne
objOne.max=3000
Delete the whole objOne object.
$ corosync-objctl -d objOne
Prove that is gone.
$ corosync-objctl objOne
SEE ALSO
confdb_initialize(3),
AUTHOR
Angus Salkeld
2008-07-29 COROSYNC-OBJCTL(8)