/tmp 中名为 ssh-* 的奇怪文件夹

Question

当我ls对 /tmp 进行操作时，我发现这些文件是我发现的 ssh 文件夹的含义

/tmp$ ls 
config-err-pBxjic
e5a28b00f2378661cc615788a1fef225-{87A94AB0-E370-4cde-98D3-ACC110C5967D}
gnome-software-TQ809Y
ssh-Rony2Zd8gQ6O
systemd-private-a789ca0968fb4855b28539acfbf9babe-colord.service-UCNgBR
systemd-private-a789ca0968fb4855b28539acfbf9babe-fwupd.service-4Xkw4W
systemd-private-a789ca0968fb4855b28539acfbf9babe-rtkit-daemon.service-KmLgj9
systemd-private-a789ca0968fb4855b28539acfbf9babe-systemd-resolved.service-F55I3N
systemd-private-a789ca0968fb4855b28539acfbf9babe-systemd-timesyncd.service-W5W5Kx
unity_support_test.0

/tmp$ cd ssh-Rony2Zd8gQ6O/
/tmp/ssh-Rony2Zd8gQ6O$ ls 
agent.1616
/tmp/ssh-Rony2Zd8gQ6O$ cat agent.1616 
cat: agent.1616: No such device or address

那么这个文件夹及其内容存在的意义是什么

Answer 1

该文件夹包含程序用于与ssh-agent通信的套接字：

从手册页：

$TMPDIR/ssh-XXXXXXXXXX/agent.< ppid >
    UNIX-domain sockets used to contain the connection to the
    authentication agent.  These sockets should only be readable by
    the owner.  The sockets should get automatically removed when the
    agent exits.