What does the last command do in Unix?
The last command in Linux is used to display the list of all the users logged in and out since the file /var/log/wtmp was created. One or more usernames can be given as an argument to display their login in (and out) time and their host-name.
What does & at the end of a Linux command mean?
The & makes the command run in the background. If a command is terminated by the control operator &, the shell executes the command in the background in a subshell. The shell does not wait for the command to finish, and the return status is 0.
Which command is used to show the end of file in Unix?
tail command
There are two very useful commands in Linux that let you see part of a file. The first is called head and by default, it shows you the first 10 lines in a file. The second is the tail command which by default lets you view the last 10 lines in a file.
What is the use of ampersand in Linux?
Linux Ampersand (&) when a command line ends with the &, the shell does not wait for the command to finish. You will get your shell prompt back while the command executes in the background. When execution is completed, the shell prompt will display a message as shown is the below snapshot.
What do the columns in the last Unix command mean?
From reading other posts and monitoring the output myself over a period of time, it looks like each line lists the start date and time of the session, the end time of the session (but not the end date), and the duration of the session (how long they were logged in) in a format like
What does the shell at the end of a Linux command mean?
Just be aware that the shell may close your process depending on your OS and local configurations (particularly on CENTOS/RHEL): https://serverfault.com/a/117157. I don’t know for sure but I’m reading a book right now and what I am getting is that a program need to handle its signal ( as when I press CTRL-C ).
What does the dash at the end of a command mean?
In some cases, it’s standard output or something entirely different: on su it signifies ‘start a login shell’. In other cases, it’s not interpreted at all. Muscle memory has made me create quite a few files named – because some version of some program I was used to didn’t understand the dash.
What does the @ mean in Unix and Linux stack exchange?
I think it means that the file/directory has extended attributes. On OSX, this indicates the presence of metadata associated with the file. Thanks for contributing an answer to Unix & Linux Stack Exchange! Please be sure to answer the question.