UNIX in a Nutshell: System V Edition

UNIX in a Nutshell: System V EditionSearch this book
Previous: Reference: killChapter 4
The Bourne Shell and Korn Shell
Next: Reference: newgrp
 

let

let expressions
     or 
((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.

Examples

Each example below adds 1 to variable i.

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


Previous: Reference: killUNIX in a Nutshell: System V EditionNext: Reference: newgrp
Reference: killBook IndexReference: newgrp

The UNIX CD Bookshelf NavigationThe UNIX CD BookshelfUNIX Power ToolsUNIX in a NutshellLearning the vi Editorsed & awkLearning the Korn ShellLearning the UNIX Operating System