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    In my system (ubuntu 14.04) you do not have to be superuser to run the ls command.
    – jarno
    Commented Mar 5, 2016 at 8:42
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    @jarno ls: cannot read symbolic link /proc/28783/exe: Permission denied -- it's not about running the ls command, it's about accessing the process info of a process not belonging to you. On my box, about 97% of all processes listed in /proc are root processes, and the others are distributed over 11 different users.
    – Irfy
    Commented Mar 21, 2016 at 12:53
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    ls: cannot read symbolic link '/proc/87/exe': No such file or directory lrwxrwxrwx 1 root root 0 Oct 9 07:05 /proc/87/exe
    – CS QGB
    Commented Oct 8, 2022 at 23:06