Which command is used to execute the last command you have executed?
How to run a program from CMD uSAR pINg.EXE
In order to have more tools to support the use of R we will use the RStudio software. This software is an interface – among other existing ones such as RCommander – that allows a more fluid interaction with the R program. Basically it is a mask to visualize the software that has as main advantages (1) the order and (2) the visualization of the processes that are carried out with R, all simultaneously.
The R software works as a temporary work environment, which means that the user adds data and objects (data sets with different attributes) to a “blank sheet”. Keep in mind that R works with the active memory (RAM) of the computer, therefore any analysis will only show the resulting information but will not remain as a file that can be used later. That is, if the analyses are not saved as objects (vectors, matrices, lists or other types of objects) the instructions must be repeated to obtain the result again.
Windows 10 – The RUNS command put to the test
Did you know that the terminal keeps a record of all the commands you have executed from a certain point in which you have been using it? What advantages can give us knowing that we have this kind of memory?
In a previous note we knew some keyboard shortcuts that help us to speed up both typing and editing the instructions we give to the terminal; so, this time we will talk about the history command, a command that accesses precisely to the terminal log mentioned at the beginning to allow us to repeat commands we have already used and thus avoid the need to retype them.
As mentioned above, history accesses the terminal’s log of the commands we have used and displays them on the screen. Let’s start by executing the command and see what happens:
Before we get to the end of this note, I would like to show you three keyboard shortcuts that have to do with the command we just reviewed. If you use the combination Ctrl+P you will get the same result as if you press the up arrow on your keyboard; on the other hand, if you use Ctrl+N, the same work will be done as if you press the down arrow.
Next, we are going to see a compilation of different utilities that we can perform with the History command in Linux. View or list command history in Linux Step 1This is the basic way to use this command as to view all the commands in the session by running the following in the terminal. We can see that each command that has been executed is listed with an identifier.
7. Edit History file in LinuxBy default, the History command file is written at logout time, this is a natural thing but if we are running SSH sessions where the timeout is exceeded, the history of that session will simply disappear, this can be avoided by writing directly to the bash_History file using the -w parameter:
9. Execute all the commands without leaving log in LinuxIt is possible that we disable the History command variable with which the log of the executed commands is saved, this will make that everything we do will not be recorded, for this we execute the following:
Like most modern operating systems, Linux also offers the user two possibilities of interaction: all settings that are made in the graphical user interface (GUI) can be carried out with command lines in a so-called shell.
Each shell is executed in a terminal or console. At the beginning of the computer era, stand-alone machines were used, so-called hardcopy terminals (printer or monitor with keyboard), which in modern computers were replaced by so-called terminal emulators, programs that provide users with a graphical frame with which to interact with the shell.
The shutdown commands can be used to shut down, suspend or reboot a Linux operating system. In addition to shutting down the system after a period of time, they also allow you to shut down the main power supply, set up a so-called wall message or cancel a shutdown that has already started.
Often we need to delete an entire folder and not just some single files. If you want to delete a directory in Linux, you have several options. We present you the possible ways to do it from the file manager and the terminal. We also explain what to do if you lack the necessary rights.