bash Linux shell 脚本 - 将尾值分配给变量？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12558100/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Linux shell scripting - assigning tail value to a variable?
提问by PaulG
I'm setting up a shell script that reads the last line of a log file using:
我正在设置一个 shell 脚本，它使用以下命令读取日志文件的最后一行：
tail -1 "/path/to/gdscript.log"
.. which is echo'ing the last line of the script just fine. The last line of the log dictates whether the process succeeded or failed, so I'm trying to run a quick echo as follows (this is the bit I'm failing at):
.. 这是在脚本的最后一行呼应就好了。日志的最后一行指示该过程是成功还是失败，因此我尝试按如下方式运行快速回显（这是我失败的地方）：
if [ (tail -1 "/path/to/gdscript.log") == "Process Complete" ]; then
echo "Data Transfer OK"
else
echo "Data Transfer Failed"
exit 1
fi
.. but using the script above I'm getting:
.. 但使用上面的脚本我得到：
./gdscript.sh: line 14: syntax error near unexpected token `tail'
Can someone in the know show me how to format the IF gate above so that I can work off the last line of the log file? I'm new to shell scripting and would really appreciate the help.
知道的人可以告诉我如何格式化上面的 IF 门，以便我可以处理日志文件的最后一行吗？我是 shell 脚本的新手，非常感谢您的帮助。
Thanks, Paul G
谢谢，保罗 G
回答by Sodved
To get the output of a command you need $(cmd...). So I think you mean:
要获得命令的输出，您需要$(cmd...). 所以我认为你的意思是：
if [ "$(tail -1 '/path/to/gdscript.log')" == "Process Complete" ]; then
...
回答by zjhui
you should use:if [ $(tail -1 /path/to/gdscript.log) == "Process Complete" ]; then
你应该使用：if [ $(tail -1 /path/to/gdscript.log) == "Process Complete" ]; then
