问题
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
But when running the script I get:
./rclone_sync: line 63: /Users/pjburnhill/bin/rclone_sync_ACD.log: Permission denied
In terminal, if I type cat $LOGFILE | tail -1, it gives the right output.
What permissions would the script need to have to access and print out the correct line?
Thanks, PJ
回答1:
To assign the output of a command to a variable, wrap the command in backticks or $().
RESULT=$(cat $LOGFILE | tail -1)
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.
来源：https://stackoverflow.com/questions/39982783/permission-denied-on-cat-via-shell-script