It extracts the last command from the history file. It determines whether the command completed successfully or not. It then presents the results in a system alert.
If the command completed as expected, the icon in the system alert is a small terminal window. If the command returned an error code, the icon in the system alert is a red error icon. The icon is a small terminal window, meaning everything went well. Our alias will be called cls and it will call the clear command. If the body of the alias is any more complex than this, or if it contains spaces, wrap it in single quotes.
The screen is cleared. Success, albeit shortlived. The alias will survive only as long as this terminal window remains open. Once the window is closed, the alias will vanish.
You might be wondering where the pre-packaged aliases are defined. This file is read, and the commands inside it executed whenever you start an interactive shell. That is, when you open a terminal window.
The first of these is the definition of the alert alias. The second is an if statement. Tuck them in below the section containing the ls aliases. You can create the file with this command:. The first is our cls alias which we used earlier. The next is called h. This alias is more involved, so it is wrapped in single quote marks. It uses a chain of commands linked together by pipes.
It produces a sorted list of the different file extensions and directory names, with a count for each list entry. The file has to be read in by the Bash shell before the alias definitions are live. This is done whenever an interactive shell is opened.
We can also use the Bash shell built-in. If you find yourself doing things more than once or twice, consider making an alias for it. Refreshingly forthright, the command is called unalias. To use it, give the name of the alias you wish to have Bash forget. The aliases will be gone whenever you log out or reset the system. The file should be saved and closed.
Here's an alias for finding the top level of a Git project, regardless of where you're working in it, and then changing directory to it, changing to the master branch, and performing a Git pull:. This type of alias is far from generally beneficial, but it highlights how a relatively basic alias may remove a lot of time-consuming navigation, commands, and prompt waiting. An alias that is both simpler and more universal returns you to the Git project's top level.
This alias is important since it behaves as a "temporary home" directory when you're working on a project. Going "home" should be as easy as going to your own home, and here's how to do it:. No matter how far down into your Git project's directory hierarchy you have descended, the command cg now returns you to the top. This article should have given you some ideas for your own aliases and bash functions.
Using these frequently can make your time in the shell more fun and less complicated. Remember to avoid redefining existing commands with possibly damaging behaviour. Even going the other way and aliasing a command to a safer variation can backfire the first time you use a system without it after you've grown accustomed to it. Atatus provides a set of performance measurement tools to monitor and improve the performance of your frontend, backends, logs and infrastructure applications in real-time.
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Try your day free trial of Atatus. Creating aliases in bash is a simple process. Even better, it comes with a built-in progress bar. That's why there's a simple hack you may apply to temporarily use the original command.
Wrapping up This article should have given you some ideas for your own aliases and bash functions. Monitor Your Entire Application with Atatus Atatus provides a set of performance measurement tools to monitor and improve the performance of your frontend, backends, logs and infrastructure applications in real-time.
Janani works for Atatus as a Content Writer. Most of the users like to use shortcuts for running commands. There are many commands in Ubuntu that we need to execute regularly. It will be very helpful for us if we can run those common commands by typing shortcut commands. Using bash aliases, Ubuntu users can easily create shortcut commands of the large commands those are used frequently.
Bash aliases not only make the task easier but also save the time of the users. The dot is equivalent to source. Executing the file would start a child process, execute the commands in this process, then return. All that is done in the child process has no effect on the parent process the bash from which you executed. Instead, sourcing with the dot acts exactly as if you wrote the content of the file in the terminal.
This is what you want. If you make changes, they won't apply until you start a new bash or source manually. ButtleButkus - might want to change just one user's preferences rather than the whole system. In Ubuntu the system-wide. Show 3 more comments. There are a lot of ways to create an alias. Dan Yep, using another file for aliases is much more clean, also portable between distros.
I do use that file to because some alias are not enough and a function is needed. So it's more much clean if you use a file for that task instead. Show 1 more comment. Marty Fried Marty Fried Just for completeness: The initial dot on the line. The quoting here is slightly tricky. In this example, using double quotes is unproblematic, but if the text within the quotes contains dollar signs, backslashes, etc, you will need to understand how the shell processes them inside double quotes.
You can switch to single quotes on the outside and double quotes on the inside, but you then still need to understand how Bash processes the double quotes in the alias definition. Good idea, but careless using of this function may lead to trashing. Your function definitely needs to implement some checkups to avoid such cluttering. This is a valid point.
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