[prev] [index] [next]

Shell Scripts (cont)

More on shell variables:
  • no need to declare shell variables; simply use them
  • are local to the current execution of the shell.
  • all variables have type string
  • initial value of variable = empty string
  • note that   x=1   is equivalent to   x="1"
Examples: 

$ x=5  y="6"  z=abc
$ echo $(( $x + $y ))
11
$ echo $(( $x + $z ))
5