bash - 参数太多 Shell 脚本 if 检查

Question

我正在尝试检查当天是星期日还是星期五，以及时间是否晚于20。
如果是这样，那么我想做点什么；如果没有，我想做点别的事情。
我正在使用 /bin/sh。

这给了我以下错误:

Too many arguments.

为什么？

   day_of_week=$(date -d $given_date +%u )
   hour_of_day=${ST_job:0:2}
   if [ [ $day_of_week -eq 7 ] || [ [ $day_of_week -eq 5 ] && [ $hour_of_day -gt 20 ] ] ] ; then
       something
   else
       something else
   fi

谢谢

Answer 1

您可能认为“[”只是一个分组，并且您可以有不同的任意嵌套。

事实并非如此。

“[”是 shell“test”命令的别名...并且您需要正确匹配它们:

https://www.shellscript.sh/test.html

Test is used by virtually every shell script written. It may not seem that way, because test is not often called directly. test is more frequently called as [. [ is a symbolic link to test, just to make shell programs more readable. It is also normally a shell builtin (which means that the shell itself will interpret [ as meaning test, even if your Unix environment is set up differently):

$ type [
[ is a shell builtin
$ which [
/usr/bin/[
$ ls -l /usr/bin/[
lrwxrwxrwx 1 root root 4 Mar 27 2000 /usr/bin/[ -> test
$ ls -l /usr/bin/test
-rwxr-xr-x 1 root root 35368 Mar 27  2000 /usr/bin/test

在此处查看更多详细信息(以及一些有用的示例):

Advanced Bash-Scripting Guide: 7.4. Nested if/then Condition Tests