Bashmagic collection vol1

Keep only last X lines of a file (shrink).

Deploy maven artefact to a specific repo without specifying it in pom.xml (format repoId:default:repoUrl). Repo should be specified in your .m2 settings.xml with any necessary credentials.

One liner to set password for default PostgreSQL user after initial install.

Run command inside a screen and save all output to a file

Scroll around inside a screen.

Add 4GB swap on Centos 7 with a stroke of a copy-paste.

Standard tcpdump.

Show listening ports with corresponding executables.

Show systemd logs for a specific service.

Freshly installed nginx configured as reverse proxy on Centos 7 getting “Permission denied” when connecting to backend service

Convert a certificate stored in a Java keystore to a PEM cert and key (for example, Tomcat to Nginx transition).

Disable git SSL verification per-repo.

Disable git SSL verification at clone time.

Clear git username and password cache for a repo (in case of password change or similar).

Give user sudo privileges.

Git submodule is added to an existing repo and is not resolving for you locally.

Print all TCP connections of a Docker container.

Nmap portscan.

Force JVM to use /dev/urandom instead of /dev/random (sometimes needed in low entropy environments like Docker).

Debug print all network activities on JVM level.

Create .htpasswd file for Nginx


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