Unix in a Nutshell, 4th Edition

Name

@

Synopsis

        @ variable = expression
        @ variable[n] = expression
        @

Assign the value of the arithmetic expression to variable, or to the nth element of variable if the index n is specified. With no variable or expression specified, print the values of all shell variables (same as set). Expression operators as well as examples are listed under the section "Expressions,” earlier in this chapter. Two special forms are also valid:

@ variable ++

@ variable [ n ]++

Increment variable or element by 1.

@ variable --

@ variable [ n ]--

Decrement variable or element by 1.