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apple@ubuntu:~$ ps -p 2442
  PID TTY          TIME CMD
 2442 ?        00:00:00 sshd
apple@ubuntu:~$ echo $?
0
apple@ubuntu:~$ ps -p 1234
  PID TTY          TIME CMD
apple@ubuntu:~$ echo $?
1
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apple@ubuntu:~$ pgrep sshd
2442
2994
3003
apple@ubuntu:~$ echo $?
0
apple@ubuntu:~$ pgrep sshddd
apple@ubuntu:~$ echo $?
1
apple@ubuntu:~$
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apple@ubuntu:~$ ls /proc/2442
ls: cannot read symbolic link /proc/2442/cwd: Permission denied
ls: cannot read symbolic link /proc/2442/root: Permission denied
ls: cannot read symbolic link /proc/2442/exe: Permission denied
attr    clear_refs       cpuset   exe     io       loginuid  mountinfo   net        pagemap      sched      smaps  status   wchan
auxv    cmdline          cwd      fd      latency  maps      mounts      oom_adj    personality  schedstat  stat   syscall
cgroup  coredump_filter  environ  fdinfo  limits   mem       mountstats  oom_score  root         sessionid  statm  task
apple@ubuntu:~$
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