unset.sh

一本完整的描述Unix Shell 编程的工具书的所有范例

#!/bin/bash
# unset.sh: Unsetting a variable.

variable=hello                       # Initialized.
echo "variable = $variable"

unset variable                       # Unset.
                                     # Same effect as:  variable=
echo "(unset) variable = $variable"  # $variable is null.

exit 0