Category Archives: Operating System

The following bash code might come in handy if you want to benchmark how long a program runs. The example assumes you want to pass two parameters along to the program. A timestamp is captured at the start and end … Continue reading →

2026 update: This post originally used ssh-keygen -t rsa. The current recommendation (e.g. GitHub’s SSH key guide) is Ed25519 — it produces shorter keys, is faster, and is considered more secure. Use RSA (4096-bit) only as a fallback for systems … Continue reading →

The basic command for creating a symbolic link (a “symlink” or “soft link”) to a folder or file is ln -s: 12345678ln -s /home/ronald/somefolder /home/ronald/newfolder # or if your current directory is already /home/ronald: cd /home/ronald ln -s somefolder newfolder … Continue reading →

Here are a few commands you can use to find out which Linux distribution you’re on — pick whichever your system has: 1234567cat /etc/issue cat /proc/version dmesg | head -1 cat /etc/*-release Of those, cat /etc/*-release is the most reliable … Continue reading →

Login to your Linux shell menu as root 12[root@locahost]# apt-get install vsftpd [root@locahost]# vim /etc/vsftpd.conf At VIM, 1st comment out anonymous_enable by adding a # sign at the beginning of the line # anonymous_enable=YES 2nd remove comment at local enable … Continue reading →

Tail is a very useful tool for monitoring an error stream. Sometimes the output from tail can have too much information, and its black-and-white monotone output can be hard to follow with the eyes. The basic: a Linux terminal has … Continue reading →