root
sudo snap install teams-for-linu
sudo snap install teams-for-linux
watch -n 0.2 'ls -l /etc/*{passwd,shadow,group,gshadow,subuid,subgid}*.lock 2>/dev/null'
[200~watch -n 0.2 'sudo ls -l /etc/*{passwd,shadow,group,gshadow,subuid,subgid}*.lock 2>/dev/null'
watch -n 0.2 'sudo ls -l /etc/*{passwd,shadow,group,gshadow,subuid,subgid}*.lock 2>/dev/null'
sudo apt install libcrack2 cracklib-runtime
cd /usr/share/cracklib
cd /usr/share
ls
sudo apt install libcrack2 cracklib-runtime
cd ..
cd ~
ls /usr/share/cracklib
ls /usr/share/Cracklib
ls -l /var/cache/cracklib/cracklib.*
sudo update-cracklib
dictcheck = 1
dictpath = /var/cache/cracklib/cracklib
echo password | cracklib-check
echo password | pwscore
locate -b '\.pwd' | grep -i cracklib
sudo apt install plocate
locate -b '\.pwd' | grep -i cracklib
locate -b 'pw_dict'
sudo adduser testuser
sudo sudoers
sudoers
cat /etc/passwd
sudo userdel testuser
cat /etc/passwd
sudo adduser testuser
sudo lsof /etc/passwd.lock /etc/shadow.lock 2>/dev/null
ls -l /etc/*.lock
sudo adduser testuser
ls -l /etc/*.lock
sudo lsof /etc/{passwd,shadow,group,gshadow,subuid,subgid}{,.lock} 2>/dev/null
sudo strace -f -e trace=file adduser testuser 2>&1 | grep -E 'open|O_CREAT|.lock'
sudo find /etc /var/lib/extrausers -maxdepth 2 -type f -name "*.lock"
sudo rm -f /etc/.pwd.lock
ls /etc/.pwd.lock
sudo adduser testuser
kill %4 2>/dev/null || true
pkill -9 adduser useradd vipw vigr passwd 2>/dev/null || true
sudo rm -f /etc/{.pwd,.grp,.shadow,.gshadow,passwd,group,shadow,gshadow,subuid,subgid}.lock
sudo find /etc -maxdepth 1 -type f -name "*.lock" -ls
sudo adduser testuser
kill %4 2>/dev/null || true
sudo pkill -9 adduser useradd vipw vigr passwd 2>/dev/null || true
# passwd/shadow/group & variants in /etc
sudo find /etc -maxdepth 1 -type f -name "*.lock" -ls
# runtime lock dirs used on some systems
sudo find /run/lock /var/lock -type f -name "*passwd*lock" -o -name "*shadow*lock" -o -name "*group*lock" 2>/dev/null
# anything “adduser” might be using
sudo find /run/lock /var/lock -type f -name "*adduser*lock" 2>/dev/null
sudo rm -f /etc/{.pwd,.grp,.shadow,.gshadow,passwd,group,shadow,gshadow,subuid,subgid}.lock 2>/dev/null
sudo find /run/lock /var/lock -type f -name "*passwd*lock" -o -name "*shadow*lock" -o -name "*group*lock" -o -name "*adduser*lock" -exec sudo rm -f {} +
sudo lslocks | egrep '/etc/(passwd|shadow|group|gshadow|subuid|subgid)' || echo "no kernel locks on user DB files"
mount | grep ' / '
sudo touch /etc/.locktest && sudo rm -f /etc/.locktest || echo "root FS not writable"
time getent passwd root
time getent group root
sudo adduser testuser
sudo lslocks | egrep '/etc/(passwd|shadow|group|gshadow|subuid|subgid)' || echo "no kernel locks on user DB files"
mount | grep ' on / '
sudo touch /etc/.writetest && echo "root FS writable" && sudo rm -f /etc/.writetest || echo "root FS NOT writable"
grep -i extra /etc/adduser.conf 2>/dev/null || echo "no extrausers config"
sudo mkdir -p /var/lib/extrausers
sudo chmod 755 /var/lib/extrausers
sudo adduser testuser
sudo sed -i 's/^#\?USE_EXTRAUSERS=.*/USE_EXTRAUSERS=0/' /etc/adduser.conf
grep -n '^USE_EXTRAUSERS=' /etc/adduser.conf
sudo adduser --no-extrausers --debug testuser
sudo adduser
sudo adduser testuser
which adduser
adduser --version 2>&1 | head -n1
sudo useradd -m -U testuser2
echo "RC=$?"
getent passwd testuser2
sudo passwd testuser2
getent passwd testuser
sudo userdel -r testuser
getent passwd testuser
getent group testuser
sudo groupdel testuser
sudo ls -ld /home/testuser 2>/dev/null
sudo rm -rf /home/testuser
sudo ls -l /var/mail/testuser /var/spool/mail/testuser 2>/dev/null
sudo rm -f /etc/{.pwd,.grp,.shadow,.gshadow,passwd,group,shadow,gshadow,subuid,subgid}.lock
# Confirm testuser is gone, testuser2 exists
getent passwd testuser || echo "testuser: absent (good)"
getent passwd testuser2 | cut -d: -f1,6,7
# Confirm no 'testuser' group
getent group testuser || echo "group testuser: absent (good)"
# Confirm no leftover sudoers or cron bits
sudo ls /etc/sudoers.d | grep -Fx testuser && echo "found sudoers entry for testuser" || echo "no sudoers entry for testuser (good)"
sudo crontab -u testuser -l 2>&1 | grep -q "no crontab" && echo "no crontab for testuser (good)" || true
sudo apt-get update
sudo apt-get install --reinstall adduser passwd login
sudo apt-get update
sudo apt-get install --reinstall adduser passwd login
sudo adduser --debug demo1
ls -l /usr/sbin/adduser
head -n1 /usr/sbin/adduser
sudo perl -c /usr/sbin/adduser
dpkg -S /usr/sbin/adduser
dpkg -V adduser || true
sudo apt-get update && sudo apt-get install --reinstall adduser passwd login
id testuser || true
getent passwd testuser || true
getent group testuser || true
ls -ld /home/testuser || true
# sanity of account/group files (read-only checks)
sudo pwck -r
sudo grpck -r
# see if any stale lock files exist (they block user creation)
ls -l /etc/passwd.lock /etc/shadow.lock /etc/group.lock 2>/dev/null || true
id testuser || echo "testuser not found"
sudo adduser testuser
ls -l /etc/passwd.lock /etc/shadow.lock /etc/group.lock 2>/dev/null || true
# a) see suspended/background jobs
jobs
# b) kill any suspended adduser job (replace %N if jobs shows a different number)
kill %9 2>/dev/null || true
# c) double-check for ALL common lock files, including gshadow
ls -l /etc/passwd.lock /etc/shadow.lock /etc/group.lock /etc/gshadow.lock 2>/dev/null || true
# terminate all background/suspended jobs
for j in $(jobs -p); do kill "$j"; done
sleep 2
# if any still remain, force kill
for j in $(jobs -p); do kill -9 "$j"; done
# verify nothing remains
jobs
# kill by job *numbers* (handles stopped jobs too)
for n in $(jobs | sed -E 's/^\[([0-9]+)\].*/\1/'); do kill -9 %$n; done
# verify they're gone
jobs
ls -l /etc/passwd.lock /etc/shadow.lock /etc/group.lock /etc/gshadow.lock 2>/dev/null || true
[200~sudo adduser --debug testuser
~sudo adduser --debug testuser
sudo adduser --debug testuser
sudo -i -u testuser bash -lc 'whoami && id && pwd && ls -la ~ | head'
sudo usermod -aG sudo testuser
sudo -i -u testuser bash -lc 'groups'
sudo userdel -r testuser 2>/dev/null || true
sudo userdel -r testuser2 2>/dev/null || true
sudo groupdel testuser 2>/dev/null || true
sudo groupdel testuser2 2>/dev/null || true
id testuser 2>/dev/null || echo "testuser gone"
id testuser2 2>/dev/null || echo "testuser2 gone"
ls -la /home
ls -l /var/mail/testuser /var/mail/testuser2 2>/dev/null || echo "no mailboxes found"
getent group testuser || echo "group testuser not found"
getent group testuser2 || echo "group testuser2 not found"
ls -l /etc/sudoers.d | sed -n '1p;/testuser/p;/testuser2/p'
sudo find /home /var /opt \( -nouser -o -nogroup \) -ls
# remove packages no longer needed (you saw nvidia-firmware-580 earlier)
sudo apt autoremove -y
# rotate and clean old logs
sudo journalctl --vacuum-time=14d
sudo snap install office365webdesktop --beta
sudo snap install office365webdesktop
sudo snap install whatsapp-linux-app
LS
ls
man disk space
man ds
ds
df
sudo useradd -m sandhiya
cd home
cd /home
ls
cd ..
cd ~
sudo useradd -m bapan
sudo passwd sandhiya
sudo passwd bapan
sudo passwd sandhiya
chage -d 0 sandhiya
man chage
chge -d 0 sandhiya
chage -d 0 sandhiya
sudo su -
whoami
ip a
ip addr show
ipconfig
hostname -I:
curl ipinfo.io/ip
dig +short myip.opendns.com @resolver1.opendns.com
hostname -i
netstat -rn
grep `hostname` /etc/hosts
ipconfig lan1
ipconfig -a
iconfig
ifconfig
ip addr
curl ifconfig.me
``` |

---

### 📘 Quick commands to confirm:
```bash
curl ifconfig.me
ip addr show wlP9s9 | grep "inet "
ip route | grep default
curl ifconfig.me
curl -4 ifconfig.me
ls
cd dgx-spark-developer-site.desktop
cd ~
ls
cd Pictures
ls
cd Screenshots
ls
cd ~
sudo apt update
curl -fsSL https://tailscale.com/install.sh | sh
sudo tailscale up
sudo snap install whatsapp-linux-app
sudo snap install ksnip
cd ~
cd Pictures
ls
cd Screenshots/
ls
exit
ls
cd jupyterlab
ls
exit
sudo snap install whatsapp-linux-app
ssh crmp@100.91.168.119
ssh crmp@spark-b1b8
exit
ssh nethras@100.65.121.25
ssh nsm-mac@100.65.121.25
ssh usss_apple@mac-7780.lan
ssh nsm-mac@mac-7880.lan
ssh nsm-mac@100.65.121.25
cd ~
ssh usss_apple@mac-7880.lan
ssh nsm-mac@100.65.121.25
cd ~
ls
sudo apt install python 3.12
sudo apt update
sudo apt install python3
cd nano ~/.bashrc
cd nano
nano
nano ~/.bashrc
cat ~/.bashrc
python --version
python3 --verion
python3 --version
python --version
exit
nvidia-smi
ls
cd ~
ls
cd lib
cd /usr
ls
cd !
cd ~
ls
cd home
cd ~
ls
$HOME
cd /
cdhome
cd home
ls
cd bapan
sudo cd bapan
sudo cd -D bapan
sudo -i ls /home/bapan
sudo -i ls /home/sai
sudo -i ls /home/sandhiya
sudo -i ls /home/sandhiya/Desktop
sudo -i ls /home/bapan/Desktop
sudo -i ls /home/sai/Desktop
exit
cd ~
ls
BTOP
btop
htop
w
tailscale status
ls
cd ~
ls
man wheels
pwd
ls
btop
sudo snap install btop
btop
htop
tailscale
man tailscale
tailscale ip
tailscale status
id -u
tailscale status
btop
tailscale status
exit
btop
cd..
cd~
cd ~
ls
cd /home/sandhiya
id
sudo -v
ls
cd /home/sandhiya
sudo -iu sandhiya
python -version
python --version
deactivate 2>/dev/null || true
sudo apt update
sudo apt install -y software-properties-common
sudo add-apt-repository -y ppa:deadsnakes/ppa
sudo apt update
sudo apt install -y python3.11
python3.11-venv python3.11-distutils
sudo apt install -y python3.11 python3.11-venv python3.11-distutils
ls
sudo -iu sandhiya
. "/home/crmp/.cursor-server/bin/5c17eb2968a37f66bc6662f48d6356a100b67be0/out/vs/workbench/contrib/terminal/common/scripts/shellIntegration-bash.sh"
home -user sandhiya
ls
su -ui
sudo -ui
sudo -iu sandhiya
. "/home/crmp/.cursor-server/bin/c6d93c13f57509f77eb65783b28e75a857b74c00/out/vs/workbench/contrib/terminal/common/scripts/shellIntegration-bash.sh"
. "/home/crmp/.cursor-server/bin/c6d93c13f57509f77eb65783b28e75a857b74c00/out/vs/workbench/contrib/terminal/common/scripts/shellIntegration-bash.sh"
sudo lsof -i :8000 -n -P
ls
sudo kill -15 12273
sleep 2
sudo kill -9 12273 2>/dev/null
sudo lsof -i :8000 -n -P
cd home
ls
cd ..
ls
sudo fuser -k 8000/tcp
sudo kill -15 $(sudo lsof -t -i:8000) 2>/dev/null
sleep 2
sudo kill -9  $(sudo lsof -t -i:8000) 2>/dev/null
sudo lsof -i :8000 -n -P
uid
ui
sudo -iu sandhiya
sudo tailscale logout
sudo tailscale up --authkey tskey-auth-PASTE_KEY_HERE   --ssh --advertise-tags=tag:dgx --hostname dgx-spark
sudo tailscale logout
sudo tailscale up --authkey tskey-auth-kfRgDqz66b11CNTRL-H4WPFSTuVqSTXrfF1SyYqS5qhkTP81LU6 --ssh --advertise-tags=tag:dgx --hostname dgx-spark
sudo tailscale status --self | egrep 
sudo tailscale status --self | egrep 'User|Tags|Host'
sudo tailscale logout
sudo tailscal up --ssh --advertise-tags=tag:dgx
sudo tailscale up --ssh --advertise-tags=tag:dgx
sudo tailscale logout
sudo tailscale up --ssh --advertise-tag=tag:dgx --hostname crmp
sudo tailscale up --ssh --advertise-tags=tag:dgx --hostname crmp
sudo tailscale status --self | egrep 'HostName|User|Tags'
hostname
sudo tailscale up --ssh --advertise-tags=tag:dgx --hostname spark-b1b8 --force-reauth
tailscale status
sudo tailscale status
sudo -iu sandhiya
users
sudo snap install bluebubbles
sudo snap install signal
cd ~
ls
man permissions
help file permissions
ls
cd Downloads
ls
cd ..
ls
cd /Downloads
cd Downloads
ls
who -u
kill pid 104975
kill "sandhiya"
kill 
kill "104975"
who -u
sudo pkill -KILL -u sandhiya
who -u
sudo apt install gedit
cd /Downloads
cd ..
cd Downloads
sudo apt install ./cosmo-editor.deb
sudo apt update
sudo apt install kate
uname -m
[200~echo $DISPLAY
# Should return display information like :
echo $DISPLAY
wget https://code.visualstudio.com/sha/download?build=stable\&os=linux-deb-arm64 -O vscode-arm64.deb
df -h /
ps aux | grep -E "(gnome|kde|xfce)"
sudo dpkg -i vscode-arm64.deb
sudo apt-get install -f
which code
code --version
code &
code
mkdir ~/spark-dev-workspace
cd ~/spark-dev-workspace
code .
# Create test directory and file
mkdir ~/vscode-test
cd ~/vscode-test
echo 'print("Hello from DGX Spark!")' > test.py
code test.py
sudo apt update
sudo pip install python-docx
pip install python-docx
apt install python3-docx
pip show python-docx
cd ~
cd Downloads
ls
firefox 'Payment Receipt_ One Time Payment_ Tarrant County, TX.pdf' 
tailscale status
ls
cd documents
cd Documents
ls
cd ~
cd Downloads
ls
cd ..
ls
cd spark-dev-workspace
ls
ls 
ps 
ps -ef | grep python
pgrep -af python
ls
pgrep -af python
ls
sudo su
sudo userdel -r nsm001
sudo /etc/passwd
sudo adduser nsm
nvidia-smi