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Shell Programming and Scripting

$((...)) and $[...] comparison

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Top Forums Shell Programming and Scripting $((...)) and $[...] comparison
# 8  
Old 12-21-2009
Quote:
Does $((mathematical expression)) and $[mathematical expression] mean the same?
A minor nitpick. $((...)) does not necessarily imply a mathematical expression. The following is perfectly valid
Code:
echo $((echo hi);(echo there))

This example is included in the IEEE 1003.1-2008 rationale.
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LEARN ABOUT PHP

let

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)