Linux User Creation: Difference between revisions

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echo && ls -alh /home/devops/*/.ssh/*
echo && ls -alh /home/devops/*/.ssh/*
echo && cat /etc/passwd|awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
EXE
</syntaxhighlight>
===DevOps » User » EdDSA Key===
----
<syntaxhighlight lang="bash">
cat <<'EXT'| sudo bash
DEVOPS_EXT_USERS='argo.cd drone.ci tool.tech raiyan.shahed shahed.hossain'
for EXT_USER in ${DEVOPS_EXT_USERS};do
    if id -u ${EXT_USER} &>/dev/null;then
        cat <<'EXE'| sudo -i -u ${EXT_USER} bash
if [ ! -e "${HOME}/.ssh/id_ed25519" ] && [ ! -e "${HOME}/.ssh/id_ed25519.pub" ];then
    ssh-keygen -t ed25519 -C "${USER}@shahed.biz" -N "" -q  -f ${HOME}/.ssh/id_ed25519
fi
cat ${HOME}/.ssh/id_ed25519.pub
EXE
    fi
done
EXT
</syntaxhighlight>
===DevOps » User » Delete===
----
<syntaxhighlight lang="bash">
cat << EXE | sudo bash
DEVOPS_EXT_USERS='ibrahim.sardar abdul.hakim shalina.begum'
for EXT_USER in \${DEVOPS_EXT_USERS};do
  if id -u \${EXT_USER} &>/dev/null;then
    userdel \${EXT_USER}
    rm -r /home/devops/\${EXT_USER}
  fi
done
echo && ls -alh /home/devops/
echo && cat /etc/passwd|awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/passwd|awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
echo && cat /etc/group |awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo

Latest revision as of 13:42, 9 March 2025

System » User

System » User » Homeless

cat << EXE | sudo bash
SYSTEM_SYS_USERS='activemq artemis hadoop spark keycloak minikube minio wildfly'
for SYS_USER in \${SYSTEM_SYS_USERS};do
  if ! id -g \${SYS_USER} &>/dev/null;then addgroup --quiet --system \${SYS_USER};fi
  if ! id -u \${SYS_USER} &>/dev/null;then
    adduser --quiet --system --ingroup \${SYS_USER} --home /nonexistent --shell /usr/sbin/nologin --disabled-password \${SYS_USER}
  fi
done

echo && cat /etc/passwd|awk -F : '\$3 >= 120 && \$3 < 900 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 120 && \$3 < 900 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
EXE

System » User » Resident

cat << EXE | sudo bash
mkdir -p /home/system/
SYSTEM_SYS_USERS='activemq artemis hadoop spark keycloak minikube minio wildfly'
for SYS_USER in \${SYSTEM_SYS_USERS};do
  if ! id -g \${SYS_USER} &>/dev/null;then addgroup --quiet --system \${SYS_USER};fi
  if ! id -u \${SYS_USER} &>/dev/null;then
    adduser --quiet --system --ingroup \${SYS_USER} --home /home/system/\${SYS_USER} --shell /bin/bash --disabled-password \${SYS_USER}
    chage -m 99999 -M 99999 -E -1 -I -1  \${SYS_USER}

    mkdir /home/system/\${SYS_USER}/.ssh
    touch /home/system/\${SYS_USER}/.ssh/config
    touch /home/system/\${SYS_USER}/.ssh/authorized_keys

    chown -R \${SYS_USER}:\${SYS_USER} /home/system/\${SYS_USER}/
    chmod 600 /home/system/\${SYS_USER}/.ssh/authorized_keys
    chmod 600 /home/system/\${SYS_USER}/.ssh/config
    chmod 700 /home/system/\${SYS_USER}/.ssh
  fi
done

echo && ls -alh /home/system/*/.ssh/*
echo && cat /etc/passwd|awk -F : '\$3 >= 120 && \$3 < 900 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 120 && \$3 < 900 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
EXE

DevOps » User

DevOps » User » Resident

cat << EXE | sudo bash
mkdir -p /home/devops/
DEVOPS_EXT_USERS='argo.cd drone.ci tool.tech raiyan.shahed shahed.hossain'
for EXT_USER in \${DEVOPS_EXT_USERS};do
  if ! id -u \${EXT_USER} &>/dev/null;then
    useradd --create-home --home-dir /home/devops/\${EXT_USER} --shell /bin/bash \${EXT_USER}
    chage -m 99999 -M 99999 -E -1 -I -1  \${EXT_USER}

    mkdir /home/devops/\${EXT_USER}/.ssh
    touch /home/devops/\${EXT_USER}/.ssh/config
    touch /home/devops/\${EXT_USER}/.ssh/authorized_keys

    chown -R \${EXT_USER}:\${EXT_USER} /home/devops/\${EXT_USER}/
    chmod 600 /home/devops/\${EXT_USER}/.ssh/authorized_keys
    chmod 600 /home/devops/\${EXT_USER}/.ssh/config
    chmod 700 /home/devops/\${EXT_USER}/.ssh
  fi
done

echo && ls -alh /home/devops/*/.ssh/*
echo && cat /etc/passwd|awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
EXE

DevOps » User » EdDSA Key

cat <<'EXT'| sudo bash
DEVOPS_EXT_USERS='argo.cd drone.ci tool.tech raiyan.shahed shahed.hossain'
for EXT_USER in ${DEVOPS_EXT_USERS};do
    if id -u ${EXT_USER} &>/dev/null;then
        cat <<'EXE'| sudo -i -u ${EXT_USER} bash
if [ ! -e "${HOME}/.ssh/id_ed25519" ] && [ ! -e "${HOME}/.ssh/id_ed25519.pub" ];then
    ssh-keygen -t ed25519 -C "${USER}@shahed.biz" -N "" -q  -f ${HOME}/.ssh/id_ed25519
fi
cat ${HOME}/.ssh/id_ed25519.pub
EXE
    fi
done
EXT

DevOps » User » Delete

cat << EXE | sudo bash
DEVOPS_EXT_USERS='ibrahim.sardar abdul.hakim shalina.begum'
for EXT_USER in \${DEVOPS_EXT_USERS};do
  if id -u \${EXT_USER} &>/dev/null;then
    userdel \${EXT_USER}
    rm -r /home/devops/\${EXT_USER}
  fi
done

echo && ls -alh /home/devops/
echo && cat /etc/passwd|awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h
echo && cat /etc/group |awk -F : '\$3 >= 1000 && \$3 < 65500 {printf("%-6s » %s\n", \$3, \$1)}'|sort -h && echo
EXE

Playground

lxc image list images:ubuntu/noble/desktop
lxc launch --vm images:ffa5fc9dfb84 cloudflare
lxc launch --vm images:ubuntu/noble/desktop cloudflare

lxc list status=running name=cloudflare --format=json |jq  -r '.[].state.network.[].addresses'
lxc list status=running name=cloudflare --format=yaml |yq  -r '.[].state.network.[].addresses'
lxc info cloudflare|yq '.Resources.["Network usage"][]["IP addresses"].inet'

ls -lah /usr/local/etc/cloudflared/
          ls -lah /etc/cloudflared/
            ls -lah ~/.cloudflared/

lxc snapshot cloudflare argo:24.04
lxc publish  cloudflare/argo:24.04 --alias cloudflare/argo:24.04
lxc restore  cloudflare argo:24.04

apt list --installed|grep linux-image

systemd-analyze blame

dpkg -l | grep "gnome-shell-extension"

systemctl list-dependencies graphical.target
cat /proc/acpi/wakeup

sudo apt list --installed|grep desktop-icons
sudo dpkg-query -l|grep desktop-icons

sudo apt install gnome-shell-extension-manager
apt info gnome-shell-extension-manager -a

cat <<-'EXE'|sudo bash
umount /var/snap/firefox/common/host-hunspell
snap remove firefox
EXE

cat <<-'EXE'|sudo bash
snap disable remmina
snap remove --purge remmina
EXE

systemctl list-dependencies --type=service --state=running
systemctl list-dependencies --type=service --state=active
systemctl list-dependencies docker.service
systemctl list-dependencies --all

cat /etc/passwd
cat /etc/group

cat /etc/passwd|\
awk -F : '$3 >= 1000 {printf("%-6s » %s\n", $3, $1)}'|sort -h

useradd -m -d /home/chorke -s /bin/bash chorke
useradd -m -d /home/chorke -s /bin/bash chorke

adduser --quiet --system --ingroup chorke --no-create-home    --shell /usr/sbin/nologin --disabled-password chorke
adduser --quiet --system --ingroup chorke --home /nonexistent --shell /usr/sbin/nologin --disabled-password chorke

References

Retrieved from "https://cdn.chorke.org/weke/index.php?title=Linux_User_Creation&oldid=14280"