For Debian-based distributions like Ubuntu, you would use apt-get: su -c 'apt-get install sudo' If you find that sudo is not installed, you can install it using the package manager of your Linux distribution. If sudo is not installed, this command will return sudo: without any paths following it. In this example, whereis returns the locations associated with sudo. # sudo: /usr/bin/sudo /usr/lib/sudo /usr/share/man/man8/sudo.8.gz You can check this by trying to display the location of sudo using the whereis command: whereis sudo The most straightforward cause is that the sudo package itself is not installed on your system. Let’s go through the common causes one by one and provide solutions for each. The ‘sudo command not found’ error can stem from several sources. Troubleshooting ‘sudo command not found’ Error After running this, bash should be able to locate sudo and run it successfully. This command appends /usr/local/bin to your existing PATH. You’d add it to your PATH like so: export PATH=$PATH:/usr/local/bin Suppose sudo is in the /usr/local/bin directory. If you find that the directory containing sudo is not in your PATH, you can add it using the export command. Bash will look for commands in these directories in the order they appear. In this output, each directory is separated by a colon. # /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin You can view your current PATH with the echo command: echo $PATH If the directory containing sudo is not in your PATH, you’ll encounter the ‘sudo command not found’ error. The PATH variable is a list of directories that bash searches whenever you enter a command. When you type a command in bash, the shell needs to know where to find that command’s corresponding program. Bash Command Interpretation and the PATH Variable In this example, sudo allows the apt-get update command to run with root permissions, successfully updating the package list. But without the sudo prefix, you might encounter a ‘Permission denied’ error. If you want to update the package list on your system, you’d use the apt-get update command. This command is vital for performing tasks that require administrative or root permissions. It stands for ‘superuser do,’ allowing a permitted user to execute a command as the superuser or another user, as specified in the sudoers file. The sudo command is a crucial tool in a Linux system. Understanding the Sudo Command and Its Role
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