一、Linux查看用户命令-测评
查看linux所有的用户
cat /etc/passwd 查看普通用户、系统用户（1-499）
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
systemd-network:x:192:192:systemd Network Management:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
polkitd:x:999:998:User for polkitd:/:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
chrony:x:998:996::/var/lib/chrony:/sbin/nologin
admin:x:1000:1000:admin:/home/admin:/bin/bash
zxd:x:1001:1001::/home/zxd:/bin/bash
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
geoclue:x:997:995:User for geoclue:/var/lib/geoclue:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin
gluster:x:996:992:GlusterFS daemons:/run/gluster:/sbin/nologin
qemu:x:107:107:qemu user:/:/sbin/nologin
unbound:x:995:991:Unbound DNS resolver:/etc/unbound:/sbin/nologin
usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin
libstoragemgmt:x:994:990:daemon account for libstoragemgmt:/var/run/lsm:/sbin/nologin
rtkit:x:172:172:RealtimeKit:/proc:/sbin/nologin
saslauth:x:993:76:Saslauthd user:/run/saslauthd:/sbin/nologin
pulse:x:171:171:PulseAudio System Daemon:/var/run/pulse:/sbin/nologin
abrt:x:173:173::/etc/abrt:/sbin/nologin
colord:x:992:986:User for colord:/var/lib/colord:/sbin/nologin
radvd:x:75:75:radvd user:/:/sbin/nologin
ntp:x:38:38::/etc/ntp:/sbin/nologin
saned:x:991:985:SANE scanner daemon user:/usr/share/sane:/sbin/nologin
setroubleshoot:x:990:984::/var/lib/setroubleshoot:/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
gdm:x:42:42::/var/lib/gdm:/sbin/nologin
sssd:x:989:983:User for sssd:/:/sbin/nologin
gnome-initial-setup:x:988:982::/run/gnome-initial-setup/:/sbin/nologin
tcpdump:x:72:72::/:/sbin/nologin
avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin
keithwang:x:1002:50::/data/ftp:/sbin/nologin
cat /etc/shadow !!密码已过期、！账户已禁用、*账户已锁定。查看是否存在默认账户 shutdown halt adm mail 等
root:$6$BB2cd0ae$wZB7LWfffHjLp0gYEYWGHt.uk3MfDviyYVk4VXcXc7kCYCFRx/RYCzkkcZwXBw8LO7YnMh36vXFQlmHxxv7J9/:18584:0:99999:7:::
bin:*:17834:0:99999:7:::
daemon:*:17834:0:99999:7:::
adm:*:17834:0:99999:7:::
lp:*:17834:0:99999:7:::
sync:*:17834:0:99999:7:::
shutdown:*:17834:0:99999:7:::
halt:*:17834:0:99999:7:::
mail:*:17834:0:99999:7:::
operator:*:17834:0:99999:7:::
games:*:17834:0:99999:7:::
ftp:*:17834:0:99999:7:::
nobody:*:17834:0:99999:7:::
systemd-network:!!:18550::::::
dbus:!!:18550::::::
polkitd:!!:18550::::::
sshd:!!:18550::::::
postfix:!!:18550::::::
chrony:!!:18550::::::
admin:$6$QbsgBIqYRJrVfafW$QX8lDLirFyxhOSpz26NqHm4rpT18anEi7u/VSbyx5HzravnavitHSYyBlzKfTIDhQSBCx7X/yVwPP8UVUw9rp/::0:99999:7:::
zxd:$6$pF2UZ0Mi$9G4ulaH4joyq2ThfJSUaOQa3hCKEZknB9xT28rLVCbEatC177etArdh3koztnTClwhykLjyP8AKHAd4DXjFnp1:18552:0:99999:7:::
tss:!!:18552::::::
geoclue:!!:18552::::::
rpc:!!:18552:0:99999:7:::
gluster:!!:18552::::::
qemu:!!:18552::::::
unbound:!!:18552::::::
usbmuxd:!!:18552::::::
libstoragemgmt:!!:18552::::::
rtkit:!!:18552::::::
saslauth:!!:18552::::::
pulse:!!:18552::::::
abrt:!!:18552::::::
colord:!!:18552::::::
radvd:!!:18552::::::
ntp:!!:18552::::::
saned:!!:18552::::::
setroubleshoot:!!:18552::::::
rpcuser:!!:18552::::::
nfsnobody:!!:18552::::::
gdm:!!:18552::::::
sssd:!!:18552::::::
gnome-initial-setup:!!:18552::::::
tcpdump:!!:18552::::::
avahi:!!:18552::::::
keithwang:!!:18554:0:99999:7:::