如何避免在 bc 输出中换行

Question

我在 GNU v. 1.06 中有以下示例（我无法确定与行长度有关的限制）：

v=$(bc -l <<<"scale=100;4*a(1)"); echo $v

返回：

3.141592653589793238462643383279502884197169399375105820974944592307\ 
8164062862089986280348253421170676

是否可以删除此函数输出中的反斜杠和回车符，或者我正在寻找不存在的东西？

Answer 1

至少在 GNU 中bc，您可以将环境变量设置BC_LINE_LENGTH为零值，例如

BC_LINE_LENGTH=0 bc -l <<<"scale=100;4*a(1)"

来自man bc：

BC_LINE_LENGTH
       This should be an integer specifying the number of characters in
       an  output  line  for  numbers.  This includes the backslash and
       newline characters for long numbers.  As an extension, the value
       of  zero  disables  the  multi-line feature.  Any other value of
       this variable that is less than 3 sets the line length to 70.