bash snippits

A collection of misc bash snippits for my own memory.

# Converting all files in a directory to unix EOL markers
find . -type f -print0 -name '*.ext' | xargs -0 dos2unix

APF firewall

# Modify ports:
vim /etc/apf/conf.apf

# Restart a service (eg apf firewall) using systemctl
/bin/systemctl {start | stop | restart} apf

SSH

# General new public/private keys. Creates:
# ~/.ssh/id_rsa (PRIVATE)
# ~/.ssh/id_rsa.pub
ssh-keygen

# Display fingerprint
ssh-keygen -l

# Copy to a remote machine w/ existing access
ssh-copy-id user@remotehost

# Key can be manually registered on a remote machine by
# manually appending to ~/.ssh/authorized_keys (1 line per key)
echo public_key >> ~/.ssh/authorized_keys

PM2

A process manager for node.js applications.

# Show status of running jobs
pm2 status

# Start a job
# --watch to auto-restart
# --time to log timestamps (call also be added to restart)
pm2 start dist/index.js --name my-job

# Restart a job
pm2 restart my-job

# Show a terminal status ui
pm2 monit

# Show logs for a particular job
pm2 logs my-job --lines 1000 --timestamp

# Generate a startup script for server
# PM2 will auto-restart if the job crashes... but if the
# server restarts, PM2 will not and will not restart the jobs.
# This can be fixed by installing a startup script that will
# register PM2 as a system service. Run this command then copy
# and run the resulting command.
pm2 startup

# Deletes an a job. Accepts id if case duplicate jobs
pm2 delete job_name

# Show details for the job
pm2 describe

# Set an env variable
NODE_ENV=true pm2 restart my-job --update-env