Update alternatives java8/30/2023 When to use the alternatives commandĪ simple and realistic example: you have a command on your system called em, which launches a simple text editor. Red Hat rewrote the command without Perl, and it's been propagated throughout Fedora-based distributions such as Red Hat and CentOS, as well as other distributions that look to Red Hat for the functional definition of the Linux Standard Base (LSB). Originally, this was a convenience utility, written in Perl, from the Debian Linux project, called update-alternatives. The alternatives command began its life as, interestingly, an alternative. Unless that is, you use the alternatives command. In theory, a Linux sysadmin can offer many system tools according to function rather than by the exact name of the executable, but that often requires a lot of symlinking and version tracking. In fact, even applications don't always care how something is achieved as long as all of its system calls are answered correctly. How well do you know Linux? Take a quiz and get a badgeĪbstractions can be helpful to users because many users don't care how their computer achieves a task as long as it's on target.Linux system administration skills assessment.A guide to installing applications on Linux. Download RHEL 9 at no charge through the Red Hat Developer program.
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