[英]Shell script continues to run even after exit command
My shell script is as shown below: 我的shell脚本如下所示:
#!/bin/bash
# Make sure only root can run our script
[ $EUID -ne 0 ] && (echo "This script must be run as root" 1>&2) || (exit 1)
# other script continues here...
When I run above script with non-root user, it prints message "This script..." but it doe not exit there, it continues with the remaining script. 当我使用非root用户运行上面的脚本时,它会输出消息“This script ...”但它不会从那里退出,它继续使用剩余的脚本。 What am I doing wrong? 我究竟做错了什么?
Note: I don't want to use if condition. 注意:我不想使用if条件。
You're running echo
and exit
in subshells. 你正在运行echo
并exit
子shell。 The exit call will only leave that subshell, which is a bit pointless. 退出调用只会留下子shell,这有点无意义。
Try with: 试试:
#! /bin/sh
if [ $EUID -ne 0 ] ; then
echo "This script must be run as root" 1>&2
exit 1
fi
echo hello
If for some reason you don't want an if
condition, just use: 如果由于某种原因你不想要if
条件,只需使用:
#! /bin/sh
[ $EUID -ne 0 ] && echo "This script must be run as root" 1>&2 && exit 1
echo hello
Note: no ()
and fixed boolean condition. 注意:no ()
和固定的布尔条件。 Warning: if echo
fails, that test will also fail to exit. 警告:如果echo
失败,该测试也将无法退出。 The if
version is safer (and more readable, easier to maintain IMO). if
版本更安全(更易读,更易于维护IMO)。
I think you need &&
rather than ||
我认为你需要&&
而不是||
, since you want to echo and exit (not echo or exit). ,因为你想回声和退出(不回声或退出)。
In addition (exit 1)
will run a sub-shell that exits rather than exiting your current shell. 另外(exit 1)
将运行一个退出而不是退出当前shell的子shell。
The following script shows what you need: 以下脚本显示了您的需求:
#!/bin/bash
[ $1 -ne 0 ] && (echo "This script must be run as root." 1>&2) && exit 1
echo Continuing...
Running this with ./myscript 0
gives you: 使用./myscript 0
运行此./myscript 0
可以:
Continuing...
while ./myscript 1
gives you: 而./myscript 1
给你:
This script must be run as root.
I believe that's what you were looking for. 我相信这就是你要找的东西。
I would write that as: 我会把它写成:
(( $EUID != 0 )) && { echo "This script must be run as root" 1>&2; exit 1; }
Using { }
for grouping, which executes in the current shell. 使用{ }
进行分组,在当前shell中执行。 Note that the spaces around the braces and the ending semi-colon are required. 请注意,大括号周围的空格和结束的分号是必需的。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.