Linux useful scripts

linux_useful_scripts.sh

# https://news.hada.io/topic?id=7286
alias df='df -h -x tmpfs -x devtmpfs -x squashfs'
alias xc='xclip -sel clipboard'
alias ttfb='curl -so /dev/null -w "HTTP %{http_version} %{http_code} Remote IP: %{remote_ip}\nConnect: %{time_connect}\nTTFB: %{time_starttransfer}\nTotal time: %{time_total}\nDownload speed: %{speed_download}bps\nBytes: %{size_download}\n"'

ap() {
    https $@ Accept:application/activity+json
}

shodan() {
    xdg-open https://shodan.io/domain/$1
    dig +short $1 | xargs -i xdg-open https://shodan.io/host/{}
}

check_mtu() {
    local target=$1
    shift
    local lower=0
    local upper=1500
    until [[ $((lower + 1)) -eq $upper ]]; do
        current=$(((lower + upper) / 2))
        echo -n "lower: $lower, upper: $upper, testing: $current -- "
        if ping -M do -s $current -c 2 -i 0.2 $target $@ &>/dev/null; then
            echo "ok"
            lower=$current
        else
            echo "fail"
            upper=$current
        fi
    done

    echo "max packet size: $lower, mtu: $((lower + 28))"
}

# https://news.hada.io/topic?id=9118
killport() {  
  if [ $# -ne 0 ]; then  
    for port in "$@"; do  
      pids=$(lsof -ti ":$port")  
      if [ -n "$pids" ]; then  
        echo "Processes listening on port $port: $pids"  
        echo "$pids" | xargs kill -9 >/dev/null 2>&1  
        echo "Processes listening on port $port have been terminated"  
      else  
        echo "No process found listening on port $port"  
      fi  
    done  
  else  
    echo "No arguments provided"  
  fi  
}

lsof -i -P | grep -i "listen"

lsof -t -i TCP:8080 | xargs kill -9

netstat -an |grep LISTEN

nmcli connection show

#!/bin/bash

if [ -z "$1" ]; then
echo "sudo yumoffline.sh [packageName]"
exit 1
fi

if [ "$EUID" -ne 0 ]
then echo "Please run as root (sudo yumoffline.sh [packageName])"
exit
fi

set -x #echo on

Ubuntu Network

ip addr set enp4s0 up
nmtui
sudo lshw -C network

Boot kernel log

dmesg

sudo nano /etc/systemd/system/autostart-mount.service

[Unit]
Description=Mount Share at boot
After=network.target

[Service]
User=root
ExecStart=/bin/mount -a
ExecStartPre=/bin/sleep 10
Restart=on-failure

[Install]
WantedBy=multi-user.target

sudo nano /etc/systemd/system/jupyterlab.service

[Unit]
Description=JupyterLab
After=syslog.target network.target

[Service]
User=root
Environment="PATH=/usr/local/bin:/usr/bin:/bin"
ExecStart=/usr/local/bin/jupyter lab --ip 0.0.0.0 --port 8888 --no-browser --allow-root
#ExecStart=/usr/local/bin/jupyter notebook --ip 0.0.0.0 --port 8888 --no-browser --allow-root
#ExecStart=/usr/local/bin/jupyterhub --ip 0.0.0.0 --port 8888
ExecStartPre=/bin/sleep 20

[Install]
WantedBy=multi-user.target

script -c "ls --color=auto" output.txt

change wayland to X11
rustdesk/rustdesk#670
sudo nano /etc/gdm3/custom.conf

systemctl status display-manager.service