02-12-2014
I mean ((x+=1)) is much faster than (($x+=1))
And that is dependent on the code being in a loop. ksh precompiles loops and executes the compiled code. With the second form, ksh must expand the variable and then rescan the full resulting expression. With the first form ksh can use the compiled code with no rescan.
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let(1) User Commands let(1)
NAME
let - shell built-in function to evaluate one or more arithmetic expressions
SYNOPSIS
ksh
let arg...
DESCRIPTION
ksh
Each arg is a separate "arithmetic expression" to be evaluated.
EXIT STATUS
The following exit values are returned:
0 The value of the last expression is non-zero.
1 The value of the last expression is zero.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
ksh(1), set(1), typeset(1), attributes(5)
SunOS 5.10 15 Apr 1994 let(1)