Base image

Alnoda workspaces are based on the popular minimized Ubuntu image, which means that standard Linux Ubuntu commands are available

Command	Description	Example
sudo	Allows a permitted user to execute a command as the superuser or another user.	sudo apt-get update
apt-get	The APT package handling utility (CLI), used for example to install or update software.	apt-get install pkgname
cd	Changes the current directory.	cd /home/username/Documents
ls	Lists all files and directories in the current directory.	ls
pwd	Displays the path of the current directory.	pwd
touch	Creates a new empty file.	touch newfile.txt
cp	Copies files and directories.	cp source destination
mv	Moves or renames files and directories.	mv oldname newname
rm	Removes files or directories.	rm filename
cat	Displays the content of a file.	cat filename
grep	Searches for a specific pattern in a file.	grep 'word' filename
chmod	Changes the permissions of a file or directory.	chmod 755 filename
chown	Changes the ownership of a file or directory.	chown username:group filename
ps	Shows the currently running processes.	ps
top	Displays real-time system information including CPU usage, memory usage, and running processes.	top
df	Displays disk usage.	df
du	Estimates file and directory space usage.	du
ping	Checks network connectivity.	ping www.example.com

User

The workspace is initially set to the user 'abc', who belongs to the sudo group. However, you have the option to switch to the root user by using the command sudo su root.

Project dir

The /home/project directory is designated as the default working directory where you can store code repositories, data files, artifacts, and so on. The alias cd ~p can be used to quickly navigate to this project folder.

Processes

Docker is typically used to run a single process within a container. However, workspaces have multiple processes and, for this reason, they leverage supervisord. Supervisord ensures that as soon as a workspace container is initiated, all the necessary persistent services also start running.

Cron

Cron, a time-based job scheduling system, can schedule jobs (commands or scripts) to run periodically at fixed times, dates, or intervals. It is commonly used to automate system maintenance or administration tasks, such as disk backups, system updates, checking and reporting, etc.

Cron is pre-configured in the workspace, and its daemon service automatically starts upon the starting of the workspace.

To schedule an execution of a task edit crontab file:

<font color="#5EA702">crontab</font> -e

Example of cron job definition:   
.---------------- minute (0 - 59)   
|  .------------- hour (0 - 23)
|  |  .---------- day of month (1 - 31)
|  |  |  .------- month (1 - 12) OR jan,feb,mar,apr ...
|  |  |  |  .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
|  |  |  |  |
*  *  *  *  *  command to be executed

For example to schedule a task that will every minute append username at the end of the text file /home/project/my-username.txt you would add to the crontab the following line:

* * * * * echo $(whoami) >> /home/project/my-username.txt