Download GNU Linux Basic by Joaquín López Sánchez-Montañés, Sofia Belles Ramos, Roger PDF

By Joaquín López Sánchez-Montañés, Sofia Belles Ramos, Roger Baig Viñas, Francesc Aulí Llinàs

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Example text

We should only use this command when we do not belong to the group in question and know the password (which ought to be activated in the group file). If all we need are the permissions of the group in question to run a particular command, we can also use sg. GNU/Linux versatility As we can see, with GNU/Linux we have more than one way of carrying out certain tasks. This is the system’s overall approach: we can edit the files directly and modify them ourselves, use some of the existing commands, create them ourselves etc.

If we execute the command, we will see that in addition to the programs being run by the users, there are others. Many of these execute the functions required for the operating system to function correctly, others are configured application servers etc. • -l: it displays extensive information for each process, such as the CPU time used, the terminal on which it is executed etc. In the second column we can also see the process status. Although the system may have many processes being executed at the same time, this does not mean that they all require constant CPU time.

Groups allows us to know which groups we belong to and id will show us user and groups. It is also interesting to be able to become another user without having to exit the session (login or su command) or to change groups with the newgrp command. We should only use this command when we do not belong to the group in question and know the password (which ought to be activated in the group file). If all we need are the permissions of the group in question to run a particular command, we can also use sg.

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