通过外壳脚本拒绝对猫的权限 [英] Permission denied on cat via shell script

问题描述

我在〜/bin/rclone_sync_ACD.log中的日志文件上的shell脚本中运行cat时遇到问题.这是外壳程序脚本中的这一行:

I have an issue with running cat in shell script on a log file which is in ~/bin/rclone_sync_ACD.log. This is the line in the shell script:

RESULT=cat $LOGFILE | tail -1

但是运行脚本时，我得到:

But when running the script I get:

./rclone_sync: line 63: /Users/pjburnhill/bin/rclone_sync_ACD.log: Permission denied

在终端中，如果键入 cat $ LOGFILE |尾部-1 ，它给出正确的输出.

In terminal, if I type cat $LOGFILE | tail -1, it gives the right output.

脚本需要具有哪些权限才能访问并打印正确的行?

What permissions would the script need to have to access and print out the correct line?

谢谢，PJ

推荐答案

要将命令的输出分配给变量，请将命令包装在反引号或 $()中.

To assign the output of a command to a variable, wrap the command in backticks or $().

RESULT=$(cat $LOGFILE | tail -1)

您的命令执行了环境变量分配 RESULT = cat ，然后执行了命令 $ LOGFILE |在该环境中的尾巴-1 .由于 $ LOGFILE 不是可执行文件，因此出现错误.

Your command performed the environment variable assignment RESULT=cat, and then executed the command $LOGFILE | tail -1 in that environment. Since $LOGFILE is not an executable file, you got an error.

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