bash - How to know if a process is going to get "Permission denied" -

me@ubuntu:~$ cat /proc/10/syscall cat: /proc/10/syscall: permission denied

i want know ahead of time if have permission access syscall.

i tried this:

file=/proc/$n/syscall     if [ -r $file ];         cat /proc/$n/syscall     else         echo "can't read"     fi

but it's not working.

any ideas?

thanks.

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