How to Display top Results Sorted by Memory Usage?
To display the “top” command result sorted by memory usage, run the “top” in the terminal and press the “Shift + M” from the keyboard to sort it.
How to Add An Existing User to an Existing Group?
To add any user to the existing group, use the “userrmod” command with the syntax “sudo usermod -a -G [Group Name] [User Name]”.
How to Enable NOPASSWD for Users in a Sudoers File?
To execute the “sudo” command without a password append the “Sudoers” file by adding “username ALL=(ALL) NOPASSWD:ALL” password configuration.
How to Let dpkg Install Dependencies Automatically?
To install dependencies automatically with the dpkg package manager, users can execute the “sudo apt install -f” command in the terminal.
How to Unzip .tgz File Using the Terminal?
To unzip the “.tgz” file in the Linux terminal, utilize the “tar”, and “gunzip”, commands. They required the zip file to have the “.tgz” extension.
How to Generate a Random String in Linux?
To generate random strings in Linux, use the “Random Number Generator”, “OpenSSL library”, “UUID generator”, and “mktemp” commands.
How to Use journalctl to View and Manipulate Systemd Logs?
The journalctl is the built-in utility to retrieve systemd logs with respect to time, service, boot-time, Kernel-related tasks, etc.
How to Remove Postgres From my Installation on Ubuntu?
To remove PostgreSQL from the system, remove all the packages of PostgreSQL by listing them. After that remove the directories and PostgreSQL users as well.
How to Add an “OR” Condition in grep?
To use the OR condition in the grep command, specify the patterns separated with “\”, or use the Flags “E” or “e” in the given syntax.
How to Enable Dark Mode of LibreOffice in Ubuntu?
To enable the dark mode in the LibreOffice application access the “Options” window from the “Tools” menu list and select “dark” in the “Colour Scheme” section.
How Do We Make chown Recursive?
To make the chown recursive, use the syntax “chown -R [Mode] [Directory/Path]” for changing the ownership, or “chown -R :[Gorup] [Directory/Path]” for the group.
How to View All Available HDDs/Partitions in Linux?
In Linux, Hard Disk Drives partitions can be viewed using “fdisk”, “cfdisk”, “lsblk”, and “parted” command line utilities or the “Disks” application.
How to Upgrade Docker on Ubuntu?
To upgrade Docker on Ubuntu, first, uninstall docker’s old version. Then, download and install the latest Docker package from the official Docker repository.
Nested Lists in Python | Detailed Guide
The Python nested list or list of lists is created using the square bracket notation and can be accessed using the index position.
How to Get Current Date and Time in Python?
To get the current date and time in Python, different functions of the datetime and time modules are used, such as date.today(), datetime.now(), etc.
Python One Line If Else
The Python one-line “if”, “if-else” and “if-elif-else” statements are created using the ternary operator or conditional expression.
Python foreach Loop
The “for-in” expression, “list comprehension” and “map()” function is used to perform the “foreach” loop on every element of the given iterator in Python.
How to Replace Values in Pandas DataFrame?
The “df.replace()” function is used to replace single or multiple values with single or multiple new values in pandas DataFrame in Python.
Multiple Ways to Create File in Python
The “open()” function is used with the “w” mode to create a file with writing permissions or use the open() function with “x” mode to create an empty file.
Python JSON Parsing Using json.load() and loads()
The “json.load()” and “json.loads()” functions are used to parse JSON data in Python objects such as dictionaries, lists, etc.
Python DateTime Format Using strftime()
The “strftime()” function is used to represent the DateTime in string format based on the specific standard directives/character codes.
How to Open a File in Python?
To open a file in Python, the “open()” function is used. A file can be opened in various modes such as read mode, write mode, append mode, etc.
How to Create a Correlation Matrix Using Pandas?
The “df.corr()”, “sn.heatmap()”, and “plt.show()” functions are used to create, represent, and plot correlation matrix in Python.
How to Find the Array Length in Python?
To find the array length the “len() function”, “array.size” attribute, “for loop”, “array.shape” attribute, and “length_hint()” functions are used in Python.
How to Convert a List to a NumPy Array?
To convert a list or list of lists to a Numpy array the “numpy.array()” function and the “numpy.asarray()” function is used in Python.
How to Convert a JSON String to CSV Using Python?
To convert the JSON string to CSV the “pd.read_json()” and “df.to_csv()” functions of the Pandas module are used in Python.
How to Add Elements to a Python Array?
To add elements to an array the “insert()” function, “+ operator”, “append()” function, and “extend()” function is used in Python.
How do I Uninstall MySQL in Ubuntu?
To uninstall MySQL in Ubuntu, remove the “mysql-server”, “mysql-client” and “mysql-common” packages from the operating system.
How to Fix “scp: not a regular file”?
The reason for the error is that the source path is not specified. To fix this error, specify the source path and copy the file recursively.
Why Does su Fail with “Authentication Error”?
The reasons for this error are, either the root password is not set or the password is being entered incorrectly. To fix this, change/set the root password.
How to Save the Terminal Output to a File?
To save the output of the terminal into a file, three methods are utilized which are Redirection Operator, tee utility, or script method.
How to install .run files?
In Linux, all the “.run” files can be installed by using the “chmod” command and the “Permissions” options to make them executable.
How to Check Which Shell I am Using?
In Linux, the “echo”, “ps”, “lsof”, and “readlink” commands become handy to check the shell. The “/etc/passwd” file also provides valid login shells.
What Does “chmod +x ” do and How to Use it?
The “chmod +x
How to Unzip a .gz File Without Removing the Gzipped File?
To unzip a .gz file without removing the original gzipped file, users can utilize the “gunzip”, “zcat” and “gzip” commands.
How to Change Password in Linux? Root User and User Account
To change the password on the root user and user account in Linux, execute the “sudo passwd root” and “sudo passwd
Most Useful Examples of firewall-cmd Command
The “firewall-cmd” command displays the firewall rules, allows a specific service, blocks a port, reloads the firewall, gets the firewall zone, and many more.
How do I Install Fonts on Ubuntu?
To install fonts on Ubuntu, use the “Font-Manager” application, add the font to the default font directory, or, manually create the font directory.
How to Set Date Through Command Line in Linux?
To set the date through the command line, utilize the “date”, “hwclock”, “timedatectl” and “ntpdate” commands by specifying the “YYYY-MM-DD hh:mm:ss” format.
What Does “export PATH=something:$PATH” Mean in Linux?
The “export PATH=something:$PATH” command changes the “PATH” environment variable of the current system by specifying the path in the “something” variable.
How to Find All Large Files in the Root Filesystem in Linux?
To find all large files in the root filesystem, you can utilize the “find”, “du”, and “ncdu” commands. Also, you can specify the size limit, and sorting order.
How to See Full Log From systemctl status service?
To see the full log from systemctl status services, execute the “systemctl status service_name -l” command in the system.
Is Linux Unix?
Linux is a Unix-like operating system because it works on the same design and principle as Unix, but it is not the exact implementation of Unix.
How to View File Size/Details From ls Command in Linux?
Linux offers the “ls” command with “l”, “s”, and “h” options to view the file size along with detail in “long”, “sorting”, and “human-readable” format.
What is the “eval” Command in Bash?
In Bash, the “eval” command evaluates its arguments as a shell script including “commands”, “variables”, “arithmetic expressions”, and “strings”.
How To Find Last Login on Linux?
To find the last login on Linux, use the “last”, “lastlog”, “/var/log/auth.log”, “who” and “lastb” commands that display username, terminal, date, and time.
What is the Difference Between “chmod +x” and “chmod 755”?
The “chmod +x” makes the file/directory executable for all users while the “chmod 755” sets various types of permissions to the users.
How to Use sudo Command to Install .tar.gz?
To install the “tar.gz” files using sudo, extract the files, configure the binaries, then compile them, and lastly install the executable using sudo.
How to Install Linux Mint on VirtualBox?
To install Linux Mint using VirtualBox, download the VirtualBox and create/customize the virtual machine. Read this post for a step-by-step procedure.
How to Update Kernel to the Latest One on Ubuntu?
To install the latest Kernel on Ubuntu, use the “Mainline” tool or manually download the Debian files to update the Kernel.
How Can I Use Docker Without sudo?
Create the docker group (if it does not exist), add the particular user to the docker group, and then restart your computer to apply the changes.
How to Select a Random Item From a List and Set? | Python random.choice()
The “random.choice()” and “random.choices()” functions are used in Python to select random items from single or multiple lists or sets.
How to Reverse an Array in Python?
To reverse an array in Python, the “reverse()” method, “reversed()” method, “flip()” method, and “Slicing” method are used.
How to Remove a Character From a String in Python?
To remove a character from the string the “replace()” function, “join()” function, “for” loop, “translate()” and string slicing methods are used in Python.
How to Print an Array in Python?
To print the simple array or numpy array the “print()” method and “for loop” method are used in Python. The “numpy.array()” function creates the numpy array.
How to Measure the Execution Time of a Python Program?
To calculate the execution time of the Python program, use the “time” module, “timeit” module, “datetime” module, and “time.process_time_ns()” function.
How to Get Max Int in Python?
To find the max int, the “sys.maxsize()” and “np.iinfor()” functions are used in Python. The “~sys.maxsize” is used to find the minimum integer.
How to Iterate Through List in Python? Easy Ways
To iterate through the list, the for loop, list comprehension, Loop with range() function, While loop, enumerate(), and lambda functions are used in Python.
TTY: The Definition and Its Uses
The TTY is a character-based device used as a medium for entering data, still a crucial part of the operating systems but in software form.
How to Fix “ConnectionError: Max retries exceeded with url” in Python?
To resolve ConnectionError in Python, various fixes are used such as checking the URL, using a retry object, try-except, and maintaining a stable connection.
How to Get Timestamps in Python?
To get timestamps in Python, the “datetime”, “calendar”, and “time” modules are used. The “datetime” module can be used to convert timestamps into DateTime.
How to Display Images in Python?
To display the images in Python, the “Pillow” module, the “OpenCV” module, the “Scikit-Image” module, the “Matplotlib” module, and the “Tensorflow” are used.
How to Concatenate Two Lists in Python
To create the list of tuples in Python, the “square bracket[]”, “map()” function, “zip()” function, and the List Comprehension method are used.
How to Concatenate Two Lists in Python?
To concatenate two lists the “+ Operator”, “extend()” function, “itertools.chain()” function, “the ‘*operator” and list comprehension is used in Python.
Generate Random Strings and Passwords in Python
To generate random strings and passwords using upper and lower case letters, digits, symbols, etc. the random and string modules are used in Python.
Generate Random Integer Number in Python | randrange() and randint()
The “randrange()” and “randint()” functions are used to generate the random integers within the specified range in Python.
Generate Random Float Numbers in Python | random() and Uniform()
The “random.random()” function and “random.uniform()” function is used in Python to generate the random float number within the specified range.
5 Easy Ways to Write List to a File in Python
To write the list to a file, the “write()” function, “writelines()” function, “JSON”, and “Pickle” modules are used in Python.
3 Easy Ways to Initialize a Python Array
In Python, the square brackets[], np.empty() function, and list comprehension method are used to initialize or create an array.
3 Easy Ways to Check If File Exists in Python
To check if a file exists at the given path the “os.path.exists()” function, “os.path.isfile()” function, and “pathlibPath.exists()” function is used in Python.
