Linux shell脚本日期算法

Question

我有一个shell脚本

 #!/bin/bash
START=$(date +%s)
echo "  Start| $START "
# do something
# start your script work here
#  
# your logic ends here
END=$(date +%s)
echo "  End|  $END "
DIFF=$(( $END-$START ))
echo "  Diff in seconds|"  $DIFF

仍然出现这个错误 开始| 1349769151 结束| 1349769151 ")49769151rror: 无效算术运算符(错误标记为 "

我知道是基本的，所以我已经搜索调试了两天了。但是仍然没有任何效果。请帮忙!

Answer 1

START和END不是日期格式，不能相减。如果您只想测量执行时间，则仅使用 %s，这将以秒为单位给出差异。

START=$(date +%s)
echo "  Start| $START "
# do something
# start your script work here
#  
# your logic ends here
END=$(date +%s)
echo "  End|  $END "
DIFF=$(( $END-$START ))
echo "Diff in seconds:" $DIFF