Linux 中的 dc 命令及示例

Linux 中的dc命令用于计算算术表达式。它以后缀表达式的形式计算表达式。输入一个数字会将其推入堆栈，输入一个运算符会计算一个表达式并将结果推回堆栈。它可以计算 +、-、/、*、%、^。可以使用不同的命令来操作堆栈。

句法：

dc [OPTION] [file ...]

下表说明了不同的命令及其解释：

Command	Operation
p	Prints the value on the top of the stack and ends the statement with a newline.
n	Prints the value on the top of the stack and ends the line with a null statement.
f	Prints the entire stack, without any alteration.
P	Pops the value from the top of the stack.
c	Clear the stack.
d	Duplicates the top value and push it into the main stack.
r	Reverses the order of top two elements in the stack.
Z	Pops the value from the stack, calculate the number of digits in it and pushes that number.
X	Pops the value from the stack, calculate the number of fraction digits in it and pushes that number.
z	Pushes the stack length into the stack.
i	Pops the value from the stack and uses it as input radix.
o	Pops the value from the stack and uses it as output radix.
k	Pops the values from the stack and uses it to set precision.
I	Pushes the value of input radix into the stack.
O	Pushes the value of output radix into the stack
K	Pushes the precision value into the stack.

示例 1：

示例 2：

注意：在第二个例子中，输出改变是因为我们改变了输出基数。

选项：

• 表达式：此命令用于评估特定表达式。
  

• file ：此命令用于评估文件的内容。
  

• help ：此命令显示帮助信息。
  

• version ：该命令用于显示版本信息。