请教如何在shell中比较两个小数的大小？

james_guan

请教如何在shell中比较两个小数的大小？
比如0.5和0.7的大小。

seamonkey

zsh 或 ksh93

a=0.1
b=1.0

(( a < b )) && echo 'a < b'

james_guan

bash下该如何呢，这样似乎不可以。
还有最好能比较负数，比如-0.5和-0.7

yongjian

bash doesn't support floating. it treats them as string. there are many apps can do this, such awk, bc..