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UNIX in a Nutshell: System V Edition

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The Bourne Shell and Korn Shell
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let expressions

Korn shell only. Perform arithmetic as specified by one or more integer expressions. expressions consist of numbers, operators, and shell variables (which don't need a preceding $). Expressions must be quoted if they contain spaces or other special characters. The (( )) form does the quoting for you. For more information and examples, see "Arithmetic Expressions" earlier in this section. See also expr in Section 2.


Each example below adds 1 to variable i.

i=`expr $i + 1`
let i=i+1
let "i = i + 1"
(( i = i + 1 ))

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