do_increment

来自「Advanced Bash&#8722 Scripting Guide An 」· 代码 · 共 21 行

#!/bin/ksh
# Script name: increment
# Example 10.122


# Using the return Command)
function increment {
    typeset sum       # sum is a local variable.
    (( sum = $1 + 1 ))
    return $sum       # Return the value of sum to the script.
} 

print -n "The sum is "
increment 5     # Call the function increment and pass 5 as a
                # parameter. 5 becomes $1 for the increment 
                # function.
print $?        # The return value is stored in the ? variable
print $sum      # The variable "sum" was local to the 
                # function, and is undefined in the main 
                # script. Nothing is printed.