How to check if file does not exist in Bash
Author: Vivek Gite Last updated: February 27, 2021 Like
FreeBSD jail, xen, and .pam_login_access security fixes released
All supported versions of FreeBSD are affected by various security bugs that need to be applied ASAP. If the process is privileged, it may escape jail and gain full access …
How To Find Out Which Groups A User Belongs To In Linux
A Linux group is a collection of one or more users with identical permission requirements on files and directories. An user can be a member of more than group at …
Adding spice to your sudo session with a lecture file on Linux or Unix
Despite some severe bugs in sudo, it remains the defacto tool to gain root shell or run command as another user on Linux, macOS, and Unix-like systems. The sudo command …
How to remove carriage return in Linux or Unix
How do I remove all the carriage returns r (^M) from a file in Unix using the command-line options?A carriage return is nothing but a control character used to reset …
How to password protect directory with Nginx .htpasswd authentication
I need to restrict access to /app/ directory on Nginx. How do I set up password protect a directory with Nginx .htpasswd authentication on Linux or Unix-like systems? Tutorial details …
How to check if bash variable defined in script
I need to set a bash environment variable called PURGEIMAGE and take specific actions in my script. For example, if PURGEIMAGE set, then purge images from CDN else just URL. …
How to install Homebrew on macOS to use the brew package manager
Homebrew is an essential package manager for developers, sysadmins, and power users on macOS. Homebrew allows us to install the latest and updated version of popular applications, packages, and developer …
How to force awk not to print a newline
I have two columns (fields) in my text file. I am trying to insert ‘|‘ between two and create an HTML table based upon the updated file. My sample input …
How to set up FreeBSD 12 VNET jail with ZFS
How do I install, set up and configure a FreeBSD 12 jail with VNET on ZFS? How can I create FreeBSD 12 VNET jail with /etc/jail.conf to run OpenVPN, Apache, …