Tag Archives: script

Enumerate applications listening to a computer port

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How to figure which application/process is already using a port?

For example, below apache is failing to start because port 80 is already taken by some other application.

Apr 11 21:08:13 ip-172-26-0-194 systemd[1]: Starting The Apache HTTP Server...
Apr 11 21:08:13 ip-172-26-0-194 apachectl[17997]: (98)Address already in use: AH00072: make_sock: could not bind to address [::]:80
Apr 11 21:08:13 ip-172-26-0-194 apachectl[17997]: (98)Address already in use: AH00072: make_sock: could not bind to address 0.0.0.0:80

Here is a script which can help you find this info.

application_port_list.sh
# list out the processes using a port.
# This script does not give the exact answer but potential solutions. It uses
# three tools one after another.
#
#  - lsof
#  - netstat
#  - ss
set -e
PORT="$1"
echo "Looking for application using port $PORT"
if command -v lsof &> /dev/null
then
    sudo lsof -i :$PORT
fi
if command -v netstat &> /dev/null
then
    netstat -tulpn | grep ":$PORT"
    exit;
fi
if command -v ss &> /dev/null
then 
    sudo ss -tulp | grep ":$PORT"
    
    exit;
fi

self-hosted ntfy service with admin account

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  • First, we need a script that setup admin account for us after starting the service. init.sh file that you should put inside ntfy/init.sh 
    #!/bin/sh
ntfy serve &
sleep 2
NTFY_PASSWORD=${NTFY_PASSWORD} ntfy user add --role=admin ${NTFY_USER}
wait
  • Now the compose file compose.yaml or docker-compose.yaml file. 
    services:
  ntfy:
    image: binwiederhier/ntfy
    container_name: ntfy
    entrypoint: [ "/bin/sh", "/var/lib/ntfy/init.sh" ]
    environment:
      - TZ=UTC    \# optional: set desired timezone
      - NTFY_BASE_URL=https://ntfy.dilawars.me
      - NTFY_AUTH_FILE=/var/lib/ntfy/auth.db
      - NTFY_CACHE_FILE=/var/lib/ntfy/cache.db
      - NTFY_AUTH_DEFAULT_ACCESS=deny-all
      - NTFY_ATTACHMENT_CACHE_DIR=/var/lib/ntfy/attachments
      - NTFY_ENABLE_LOGIN=true
      - NTFY_USER=admin
      - NTFY_PASSWORD=yoyodillusingh
    volumes:
      - /var/cache/ntfy:/var/cache/ntfy
      - /etc/ntfy:/etc/ntfy
      - ./ntfy/:/var/lib/ntfy
    ports:
      - 8001:80
    healthcheck: \# optional: remember to adapt the host:port to your environment
        test: ["CMD-SHELL", "wget -q --tries=1 http://localhost:80/v1/health -O - | grep -Eo '\"healthy\"\\s*:\\s*true' || exit 1"]
        interval: 60s
        timeout: 10s
        retries: 3
        start_period: 40s
    restart: unless-stopped

A python script to uninstall pkg file on MacOS

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https://github.com/dilawar/Scripts/blob/master/pkg_uninstall.py

Usage

Pass pkg name and it will show you installed packages that matches the query and can be removed.

dilawar@halwa ~/Scripts (master)> sudo python3 pkg_uninstall.py clamav
0: com.cisco.ClamAV.programs
1: com.cisco.ClamAV.libraries
2: com.cisco.ClamAV.documentation
Select a package to uninstall 0            
Uninstalling com.cisco.ClamAV.programs
Forgot package 'com.cisco.ClamAV.programs' on '/'.
dilawar@halwa ~/Scripts (master)> sudo python3 pkg_uninstall.py clamav
0: com.cisco.ClamAV.libraries
1: com.cisco.ClamAV.documentation
Select a package to uninstall 0
Uninstalling com.cisco.ClamAV.libraries
Forgot package 'com.cisco.ClamAV.libraries' on '/'.

And that’s it.