System/Kernel
janitor@dc-9:~$ uname -a ; cat /etc/*release
Linux dc-9 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/"
SUPPORT_URL="https://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"4.19.0-6-amd64x86_64Debian GNU/Linux 10 (buster)
Networks
janitor@dc-9:~$ ip route ; arp -a
default via 192.168.207.254 dev eth0 onlink
192.168.207.0/24 dev eth0 proto kernel scope link src 192.168.207.209
bash: arp: command not foundjanitor@dc-9:~$ ss -tunlp
Netid State Recv-Q Send-Q Local Address:Port Peer Address:Port
tcp LISTEN 0 80 127.0.0.1:3306 0.0.0.0:*
tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
tcp LISTEN 0 128 *:80 *:*
tcp LISTEN 0 128 [::]:22 [::]:* 127.0.0.1:3306
Users & Groups
janitor@dc-9:~$ cat /etc/passwd ; ll /home
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
sys:x:3:3:sys:/dev:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync
games:x:5:60:games:/usr/games:/usr/sbin/nologin
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin
mail:x:8:8:mail:/var/mail:/usr/sbin/nologin
news:x:9:9:news:/var/spool/news:/usr/sbin/nologin
uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin
proxy:x:13:13:proxy:/bin:/usr/sbin/nologin
www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin
backup:x:34:34:backup:/var/backups:/usr/sbin/nologin
list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin
irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
_apt:x:100:65534::/nonexistent:/usr/sbin/nologin
systemd-timesync:x:101:102:systemd Time Synchronization,,,:/run/systemd:/usr/sbin/nologin
systemd-network:x:102:103:systemd Network Management,,,:/run/systemd:/usr/sbin/nologin
systemd-resolve:x:103:104:systemd Resolver,,,:/run/systemd:/usr/sbin/nologin
messagebus:x:104:110::/nonexistent:/usr/sbin/nologin
sshd:x:105:65534::/run/sshd:/usr/sbin/nologin
systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin
mysql:x:106:113:MySQL Server,,,:/nonexistent:/bin/false
marym:x:1001:1001:Mary Moe:/home/marym:/bin/bash
julied:x:1002:1002:Julie Dooley:/home/julied:/bin/bash
fredf:x:1003:1003:Fred Flintstone:/home/fredf:/bin/bash
barneyr:x:1004:1004:Barney Rubble:/home/barneyr:/bin/bash
tomc:x:1005:1005:Tom Cat:/home/tomc:/bin/bash
jerrym:x:1006:1006:Jerry Mouse:/home/jerrym:/bin/bash
wilmaf:x:1007:1007:Wilma Flintstone:/home/wilmaf:/bin/bash
bettyr:x:1008:1008:Betty Rubble:/home/bettyr:/bin/bash
chandlerb:x:1009:1009:Chandler Bing:/home/chandlerb:/bin/bash
joeyt:x:1010:1010:Joey Tribbiani:/home/joeyt:/bin/bash
rachelg:x:1011:1011:Rachel Green:/home/rachelg:/bin/bash
rossg:x:1012:1012:Ross Geller:/home/rossg:/bin/bash
monicag:x:1013:1013:Monica Geller:/home/monicag:/bin/bash
phoebeb:x:1014:1014:Phoebe Buffay:/home/phoebeb:/bin/bash
scoots:x:1015:1015:Scooter McScoots:/home/scoots:/bin/bash
janitor:x:1016:1016:Donald Trump:/home/janitor:/bin/bash
janitor2:x:1017:1017:Scott Morrison:/home/janitor2:/bin/bash
total 76K
4.0K drwx------ 3 chandlerb chandlerb 4.0K Jul 3 08:49 chandlerb
4.0K drwx------ 4 janitor janitor 4.0K Jul 3 08:49 janitor
4.0K drwx------ 3 joeyt joeyt 4.0K Jul 3 08:49 joeyt
4.0K drwx------ 2 fredf fredf 4.0K Jun 17 2022 fredf
4.0K drwxr-xr-x 18 root root 4.0K Jun 15 2022 ..
4.0K drwx------ 2 wilmaf wilmaf 4.0K Dec 29 2019 wilmaf
4.0K drwx------ 2 tomc tomc 4.0K Dec 29 2019 tomc
4.0K drwx------ 2 scoots scoots 4.0K Dec 29 2019 scoots
4.0K drwx------ 2 rossg rossg 4.0K Dec 29 2019 rossg
4.0K drwx------ 2 rachelg rachelg 4.0K Dec 29 2019 rachelg
4.0K drwx------ 2 phoebeb phoebeb 4.0K Dec 29 2019 phoebeb
4.0K drwx------ 2 monicag monicag 4.0K Dec 29 2019 monicag
4.0K drwx------ 2 marym marym 4.0K Dec 29 2019 marym
4.0K drwx------ 2 julied julied 4.0K Dec 29 2019 julied
4.0K drwx------ 2 jerrym jerrym 4.0K Dec 29 2019 jerrym
4.0K drwx------ 2 janitor2 janitor2 4.0K Dec 29 2019 janitor2
4.0K drwx------ 2 bettyr bettyr 4.0K Dec 29 2019 bettyr
4.0K drwx------ 2 barneyr barneyr 4.0K Dec 29 2019 barneyr
4.0K drwxr-xr-x 19 root root 4.0K Dec 29 2019 .janitor@dc-9:~$ cut -d: -f1 /etc/passwd | xargs -n1 id
uid=0(root) gid=0(root) groups=0(root)
uid=1(daemon) gid=1(daemon) groups=1(daemon)
uid=2(bin) gid=2(bin) groups=2(bin)
uid=3(sys) gid=3(sys) groups=3(sys)
uid=4(sync) gid=65534(nogroup) groups=65534(nogroup)
uid=5(games) gid=60(games) groups=60(games)
uid=6(man) gid=12(man) groups=12(man)
uid=7(lp) gid=7(lp) groups=7(lp)
uid=8(mail) gid=8(mail) groups=8(mail)
uid=9(news) gid=9(news) groups=9(news)
uid=10(uucp) gid=10(uucp) groups=10(uucp)
uid=13(proxy) gid=13(proxy) groups=13(proxy)
uid=33(www-data) gid=33(www-data) groups=33(www-data)
uid=34(backup) gid=34(backup) groups=34(backup)
uid=38(list) gid=38(list) groups=38(list)
uid=39(irc) gid=39(irc) groups=39(irc)
uid=41(gnats) gid=41(gnats) groups=41(gnats)
uid=65534(nobody) gid=65534(nogroup) groups=65534(nogroup)
uid=100(_apt) gid=65534(nogroup) groups=65534(nogroup)
uid=101(systemd-timesync) gid=102(systemd-timesync) groups=102(systemd-timesync)
uid=102(systemd-network) gid=103(systemd-network) groups=103(systemd-network)
uid=103(systemd-resolve) gid=104(systemd-resolve) groups=104(systemd-resolve)
uid=104(messagebus) gid=110(messagebus) groups=110(messagebus)
uid=105(sshd) gid=65534(nogroup) groups=65534(nogroup)
uid=999(systemd-coredump) gid=999(systemd-coredump) groups=999(systemd-coredump)
uid=106(mysql) gid=113(mysql) groups=113(mysql)
uid=1001(marym) gid=1001(marym) groups=1001(marym)
uid=1002(julied) gid=1002(julied) groups=1002(julied)
uid=1003(fredf) gid=1003(fredf) groups=1003(fredf)
uid=1004(barneyr) gid=1004(barneyr) groups=1004(barneyr)
uid=1005(tomc) gid=1005(tomc) groups=1005(tomc)
uid=1006(jerrym) gid=1006(jerrym) groups=1006(jerrym)
uid=1007(wilmaf) gid=1007(wilmaf) groups=1007(wilmaf)
uid=1008(bettyr) gid=1008(bettyr) groups=1008(bettyr)
uid=1009(chandlerb) gid=1009(chandlerb) groups=1009(chandlerb)
uid=1010(joeyt) gid=1010(joeyt) groups=1010(joeyt)
uid=1011(rachelg) gid=1011(rachelg) groups=1011(rachelg)
uid=1012(rossg) gid=1012(rossg) groups=1012(rossg)
uid=1013(monicag) gid=1013(monicag) groups=1013(monicag)
uid=1014(phoebeb) gid=1014(phoebeb) groups=1014(phoebeb)
uid=1015(scoots) gid=1015(scoots) groups=1015(scoots)
uid=1016(janitor) gid=1016(janitor) groups=1016(janitor)
uid=1017(janitor2) gid=1017(janitor2) groups=1017(janitor2)SUIDs
janitor@dc-9:~$ find / -perm -04000 -ls -type f 2>/dev/null | grep -v '/snap'
15862 428 -rwsr-xr-x 1 root root 436552 Oct 7 2019 /usr/lib/openssh/ssh-keysign
137189 12 -rwsr-xr-x 1 root root 10232 Mar 28 2017 /usr/lib/eject/dmcrypt-get-device
12495 52 -rwsr-xr-- 1 root messagebus 51184 Jun 10 2019 /usr/lib/dbus-1.0/dbus-daemon-launch-helper
60 44 -rwsr-xr-x 1 root root 44528 Jul 27 2018 /usr/bin/chsh
3890 36 -rwsr-xr-x 1 root root 34888 Jan 10 2019 /usr/bin/umount
63 64 -rwsr-xr-x 1 root root 63736 Jul 27 2018 /usr/bin/passwd
62 84 -rwsr-xr-x 1 root root 84016 Jul 27 2018 /usr/bin/gpasswd
18413 156 -rwsr-xr-x 1 root root 157192 Oct 12 2019 /usr/bin/sudo
3415 44 -rwsr-xr-x 1 root root 44440 Jul 27 2018 /usr/bin/newgrp
59 56 -rwsr-xr-x 1 root root 54096 Jul 27 2018 /usr/bin/chfn
3562 64 -rwsr-xr-x 1 root root 63568 Jan 10 2019 /usr/bin/su
3888 52 -rwsr-xr-x 1 root root 51280 Jan 10 2019 /usr/bin/mountSGIDs
janitor@dc-9:~$ find / -type f -perm -02000 -ls 2>/dev/null | grep -v '/snap'
815 40 -rwxr-sr-x 1 root shadow 39616 Feb 14 2019 /usr/sbin/unix_chkpwd
1706 36 -rwxr-sr-x 1 root tty 34896 Jan 10 2019 /usr/bin/wall
12688 20 -rwxr-sr-x 1 root mail 18944 Dec 4 2017 /usr/bin/dotlockfile
15855 316 -rwxr-sr-x 1 root ssh 321672 Oct 7 2019 /usr/bin/ssh-agent
61 32 -rwxr-sr-x 1 root shadow 31000 Jul 27 2018 /usr/bin/expiry
5442 16 -rwxr-sr-x 1 root tty 14736 May 4 2018 /usr/bin/bsd-write
5515 44 -rwxr-sr-x 1 root crontab 43568 Jun 24 2019 /usr/bin/crontab
58 72 -rwxr-sr-x 1 root shadow 71816 Jul 27 2018 /usr/bin/chageCapabilities
janitor@dc-9:~$ getcap -r / 2>/dev/nullProcesses
janitor@dc-9:~$ ps -auxwww
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 1.0 103900 10264 ? Ss 05:31 0:00 /sbin/init
root 259 0.0 0.8 40536 8816 ? Ss 05:31 0:00 /lib/systemd/systemd-journald
root 276 0.0 0.5 22188 5124 ? Ss 05:31 0:00 /lib/systemd/systemd-udevd
systemd+ 435 0.0 0.6 93080 6512 ? Ssl 05:31 0:00 /lib/systemd/systemd-timesyncd
root 440 0.0 0.7 19516 7272 ? Ss 05:31 0:00 /lib/systemd/systemd-logind
message+ 442 0.0 0.4 9144 4380 ? Ss 05:31 0:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
root 444 0.0 0.4 225824 4420 ? Ssl 05:31 0:00 /usr/sbin/rsyslogd -n -iNONE
root 446 0.0 0.2 8504 2864 ? Ss 05:31 0:00 /usr/sbin/cron -f
root 463 0.0 0.1 5612 1748 tty1 Ss+ 05:31 0:00 /sbin/agetty -o -p -- \u --noclear tty1 linux
root 473 0.0 0.6 15852 6944 ? Ss 05:31 0:00 /usr/sbin/sshd -D
root 538 0.0 0.8 135112 8872 ? Sl 05:31 0:04 /usr/bin/vmtoolsd
mysql 556 0.0 9.2 1254632 93680 ? Ssl 05:31 0:03 /usr/sbin/mysqld
root 565 0.0 2.5 201628 25592 ? Ss 05:31 0:00 /usr/sbin/apache2 -k start
root 1163 0.0 0.4 6680 4116 ? Ss 05:34 0:00 /usr/sbin/knockd -i eth0
www-data 2089 0.0 1.1 201936 11396 ? S 08:46 0:00 /usr/sbin/apache2 -k start
root 2756 0.0 0.8 16924 8304 ? Ss 08:52 0:00 sshd: chandlerb [priv]
chandle+ 2759 0.0 0.8 21020 8420 ? Ss 08:52 0:00 /lib/systemd/systemd --user
chandle+ 2760 0.0 0.2 105148 2400 ? S 08:52 0:00 (sd-pam)
chandle+ 2773 0.0 0.4 16924 5000 ? S 08:52 0:00 sshd: chandlerb@pts/0
chandle+ 2774 0.0 0.4 7652 4520 pts/0 Ss 08:52 0:00 -bash
root 2781 0.0 0.3 9748 3408 pts/0 S 08:53 0:00 su janitor
janitor 2782 0.0 0.3 6992 3756 pts/0 S 08:53 0:00 bash
janitor 2860 0.0 0.3 10916 3272 pts/0 R+ 08:55 0:00 ps -auxwwwroot 446 0.0 0.2 8504 2864 ? Ss 05:31 0:00 /usr/sbin/cron -froot 1163 0.0 0.4 6680 4116 ? Ss 05:34 0:00 /usr/sbin/knockd -i eth0
Cron & Systemd
janitor@dc-9:~$ crontab -l ; cat /etc/crontab ; systemctl list-timers
no crontab for janitor
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
17 * * * * root cd / && run-parts --report /etc/cron.hourly
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#
NEXT LEFT LAST PASSED UNIT ACTIVATES
Thu 2025-07-03 09:09:00 AEST 12min left Thu 2025-07-03 08:39:01 AEST 17min ago phpsessionclean.timer phpsessionclean.service
Thu 2025-07-03 19:45:11 AEST 10h left Thu 2025-07-03 06:19:34 AEST 2h 36min ago apt-daily.timer apt-daily.service
Fri 2025-07-04 00:00:00 AEST 15h left Thu 2025-07-03 05:33:52 AEST 3h 22min ago logrotate.timer logrotate.service
Fri 2025-07-04 00:00:00 AEST 15h left Thu 2025-07-03 05:33:52 AEST 3h 22min ago man-db.timer man-db.service
Fri 2025-07-04 05:46:37 AEST 20h left Thu 2025-07-03 05:46:37 AEST 3h 9min ago systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.
Fri 2025-07-04 06:54:13 AEST 21h left Thu 2025-07-03 06:36:10 AEST 2h 20min ago apt-daily-upgrade.timer apt-daily-upgrade.servi
6 timers listed.
Pass --all to see loaded but inactive timers, too.Services
janitor@dc-9:~$ systemctl list-units --state=running
UNIT LOAD ACTIVE SUB DESCRIPTION
proc-sys-fs-binfmt_misc.automount loaded active running Arbitrary Executable File Formats File System Automount Point
init.scope loaded active running System and Service Manager
session-22.scope loaded active running Session 22 of user chandlerb
apache2.service loaded active running The Apache HTTP Server
cron.service loaded active running Regular background program processing daemon
dbus.service loaded active running D-Bus System Message Bus
getty@tty1.service loaded active running Getty on tty1
knockd.service loaded active running Port-Knock Daemon
mariadb.service loaded active running MariaDB 10.3.17 database server
open-vm-tools.service loaded active running LSB: Runs the open-vm-tools services
rsyslog.service loaded active running System Logging Service
ssh.service loaded active running OpenBSD Secure Shell server
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-timesyncd.service loaded active running Network Time Synchronization
systemd-udevd.service loaded active running udev Kernel Device Manager
user@1009.service loaded active running User Manager for UID 1009
dbus.socket loaded active running D-Bus System Message Bus Socket
syslog.socket loaded active running Syslog Socket
systemd-journald-audit.socket loaded active running Journal Audit Socket
systemd-journald-dev-log.socket loaded active running Journal Socket (/dev/log)
systemd-journald.socket loaded active running Journal Socket
systemd-udevd-control.socket loaded active running udev Control Socket
systemd-udevd-kernel.socket loaded active running udev Kernel Socket
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
24 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.apache2.servicecron.serviceknockd.servicemariadb.service
Sudo Version
janitor@dc-9:~$ sudo --version
Sudo version 1.8.27
Sudoers policy plugin version 1.8.27
Sudoers file grammar version 46
Sudoers I/O plugin version 1.8.27Sudo version 1.8.27
Glibc Version
janitor@dc-9:~$ ldd --version
ldd (Debian GLIBC 2.28-10) 2.28
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.ldd (Debian GLIBC 2.28-10) 2.28