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Constants with a leading 0 (zero) are interpreted as octal numbers. A leading "0x" or "0X" denotes<br />
hexadecimal. Otherwise, numbers take the form "[BASE'#']N", where "BASE" is a decimal number between<br />
2 and 64 representing the arithmetic base, and N is a number in that base. If "BASE'#'" is omitted, then base<br />
10 is used. The digits greater than 9 are represented by the lowercase letters, the uppercase letters, "@", and<br />
"_", in that order. If "BASE" is less than or equal to 36, lowercase and uppercase letters may be used<br />
interchangably to represent numbers between 10 and 35.<br />
Operators are evaluated in order of precedence. Sub-expressions in parentheses are evaluated first and may<br />
override the precedence rules above.<br />
Wherever possible, <strong>Bash</strong> users should try to use the syntax with square brackets:<br />
$[ EXPRESSION ]<br />
However, this will only calculate the result of EXPRESSION, and do no tests:<br />
franky ~> echo $[365*24]<br />
8760<br />
See Section 7.1.2.2, among others, for practical examples in scripts.<br />
3.4.7. Process substitution<br />
Process substitution is supported on systems that support named pipes (FIFOs) or the /dev/fd method of<br />
naming open files. It takes the form of<br />
(LIST)<br />
The process LIST is run with its input or output connected to a FIFO or some file in /dev/fd. The name of<br />
this file is passed as an argument to the current command as the result of the expansion. If the ">(LIST)" form<br />
is used, writing to the file will provide input for LIST. If the "