![]() ![]() ![]() For example, this would allow you to quickly run ‘sudo apt-get update’ instead of typing out the full command each time. When using sudo, you can provide an alias for a command to make it easier and faster to run. Ubuntu-based distributions prefer using sudo as its default command, while Fedora and RHEL favor su instead. However, some distributions opt for su and require users to enter their password when they attempt to switch user contexts. If you are running a Linux distribution, sudo is often the preselected command to run commands with root privileges. The sudo command offers an extra layer of security that is beneficial for enterprise-level implementations, while the su command offers a convenient way to switch user contexts without any verification or authentication.Įxploring how sudo and su Function Across Various Linux Distributions The sudo command is faster and easier to use due to its limited scope and access restrictions, while the su command requires more effort from the system administrator to manage proper control.Ĥ. The sudo command requires authentication and authorization before allowing users to run privileged commands, while the su command does not.ģ. The sudo command allows you to execute commands with elevated privileges, while the su command is used to switch user contexts.Ģ. Main Differences Between Su and Sudo – At a Glanceġ. u: This option allows you to specify a target user, which will be used when running the command. To use the sudo command, you must be a member of the sudoers group and provide your password for authentication. The sudo command is used to provide additional privileges to users in order to execute commands that require special permissions. c: This option allows you to specify a command, which will be executed with the target user’s privileges. It sets the environment for the target user as if they had logged in directly. ![]() l: This option makes su behave like a login shell. This is an incredibly useful tool for anyone looking to quickly switch identities! This makes it an ideal tool when switching between users in your system. It either launches a login shell that follows your current directory and environment (su), or completely transitions to another user’s settings (su -). How to Use the su Commandīy using the su command, you can rapidly shift between users without any hassle. Additionally, sudo’s authentication process adds an extra layer of security, which can be beneficial for enterprise-level implementations. The downside is that it requires more effort from the system administrator to manage proper control of which users can become superusers. So, to wrap this up, when you pass only - to su it is basically ignoring the - and acting like you did not pass any option at all.In contrast, su makes it easy for users with the appropriate permissions to switch contexts and execute commands as another user without restriction. This is true of many command-line tools ( ls -R will do a recursive ls whereas ls -R will perform an ls on a file or directory named -R. For example, if you run touch -R you'll receive an error saying that -R is not an option to touch, but if you run touch -R it will create a file named -R. Passing a double-hyphen to a command is typically used to mark the end of command-line flags and the beginning of non-flag arguments. This includes setting your directory to your home directory and setting a bunch of other environment variables. Provide an environment similar to what the user would expect had the user logged in directly. The man page for su describes the behavior as: Passing a single hyphen is identical to passing -l or -login. When you provide a double-hyphen the experience you will have is identical to if you had just executed sudo su without any hyphen. ![]()
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