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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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