How to Convert Strings to Datetime in Pandas DataFrame?
To convert strings to datetime in Pandas DataFrame, the “pandas.to_datetime()” function, and the “DataFrame.astype()” function is used in Python.
How to Get the Day of the Week in Python?
To get the day of the week the strftime() method, weekday() method, Pandas Timestamp method, “calendar” module, and isoweekday() method are used in Python.
Array Indexing in Python | Explained With Examples
In Python, “array indexing” is used to access the specific elements/items in an array or list using their positive and negative indexing.
What are the Alternatives to Notepad++ on Ubuntu?
In Ubuntu, the alternatives to Notepad++ are “Nano”, “Gedit”, “Vim”, “Sublime text”, “Geany”, and “Kate”. Read this post for their detailed description.
What is the Purpose of the /var/lib/apt/lists Directory?
The “/var/lib/apt/lists” directory stores all the package information downloaded from the ubuntu server when the user runs the “sudo apt command”.
How to Trim Leading and Trailing Whitespace From the Output?
To trim the leading and trailing whitespaces from each line in the output of a file/script, use the Linux pre-installed “sed” and “awk” command line tools.
How to Sort Results From ls Command by Modification Date?
To sort the output of the “ls” command by modification date use its “-t” argument, and also the “-l(list)” flag that displays the “date&time” of the file/directory.
How to Set Custom Resolution Using xrandr?
In Linux, the pre-installed “xrandr” command offers the “newmode” and the “addmode” flags to set the custom resolution of the system monitor.
How to Reattach to an Existing “screen” Session?
To reattach an existing screen session, use the “screen” tool followed by the “-r(reattach)” argument and the “SID” or the “specific session name”.
How to Count Total Number of Occurrences Using grep?
To count the total number of occurrences of the specified word/pattern, use the “grep” command with the “wc(word count)” and “tr(translates)” options.
How to Convert an epoch Timestamp to a Human Readable?
To convert epoch timestamp to human-readable format use the “date” command, “awk” having starftime format, and the “localtime()” with the “echo” command.
How to Color diff Output?
To color diff output use the “diff –color” command for the newer version of “diff” and the “colordiff” command line tool for the older versions.
How to Perform a Full Re-Installation of PIP and PIP3 on Ubuntu?
To reinstall the “pip3” for Python3 and “pip” for Python 2 use the default “apt” package manager with superuser privileges or log in as a root user.
How to Use apt clean, autoclean, autoremove? | Combined and Separately
In Ubuntu, the “clean”, “autoclean”, and “autoremove” commands clean up the system cache, additional dependencies, and outdated versions of packages.
How to Add New Lines When Using echo?
To add new lines, use the “-e(backspace interpreter)” and “$(bash variable)” with the “echo” command. An “echo” tool can also be used multiple times to do this.
How to Install the Latest cURL on Linux?
In Linux and its distributions, the “curl” can be installed via default package managers i.e “apt” (Ubuntu/Debian), “yum” (CentOS/RHEL), and “dnf” (Fedora).
How to Generate a Strong Password in Linux?
To generate a strong password, use the “urandom”, “makepasswd”, “gpg”, “apg”, “pwgen”, and “openssl rand” commands. It can also be done using the “Perl” script.
How to Update NodeJS Version in Ubuntu Command Line?
To update the NodeJs versions in Ubuntu, use the “NVM(Node Version Manager)”, “NPM(Node Package Manager)”, and “Binary Packages”.
What are SUID, SGID, and Sticky bits?
In Linux, SUID, SGID, and Sticky bit are permission bits that are utilized to specify special permission rules for the file or directory.
What is gdm3, kdm, lightdm? How to Install and Remove them on Ubuntu?
gdm3, kdm, and lightdm are display managers of Linux that provide the interface for the login screen and can be installed or uninstalled.
How to Instant Search in less Command?
To instant search with the “less” command, use the “less
How to Install the Latest Python on CentOS?
To install the latest version of Python on CentOS, use the YUM package manager, and source code that is given on the official Python website.
How to Select Rows From Pandas DataFrame?
The Python “loc()” and “iloc()” functions are used to select rows from Pandas DataFrame based on the specific condition, index value, and list of values.
How to Round a Number Down in Python?
To round a number down the “math.floor()” function, “int()” function, “trunc()” function, “// operator”, and “numpy.floor()” function is used in Python.
How to Convert a String List to an Integer List in Python?
The map(), for loop, list comprehension, eval(), round(), and ast.literal_eval() functions are used to convert a string list to an integer list in Python.
How to Create a Directory in Python?
To create a directory at the existing location or at the specified path with permission, the “os.mkdir()” and the “os.makedirs()” methods are used in Python.
How to Add a Newline Character in Python?
To add a newline character, the “\n” escape character, the “multiline strings”, and the “os.linesep” attribute of the os module are used in Python.
How to Extract Dictionary Values as a List?
To extract dictionary values as a list, the “list()” function, “list comprehension”, “for loop”, “* operator”, and “map() function” is used in Python.
How to Choose Multiple Items From Any Sequence Using random.sample()?
To choose multiple items from any sequence, such as a list, set, dictionary, etc, the “random.sample()” function is used in Python.
How to Check User Input is a Number or String in Python?
The isdigit(), isinstance(), float() with isinstance(), and isnumeric() functions are used in Python to check whether the user input is a number or string.
How to Append Values to Dictionary in Python?
To append values to the dictionary the square bracket, dict(), dict.update(), for loop, unpacking operator, append(), and extend() functions are used in Python.
How to Access Google Meet in Ubuntu?
Google meet is an online platform for making audio or video calls. It is a super useful tool, especially if you are working remotely.
Difference Between “cd -” and “cd ~-” in Linux
The “cd -” and “cd ~-” jump into the recently used directory but the “cd -” also prints that directory’s absolute path in the terminal.
How Does find -name Work?
The “find -name” locates the files/directories by different parameters name, extensions, or searching and deleting the particular file/directory.
How to Copy a Directory and its Contents to a New Location?
To copy a directory and its content to the new location, use the “cp” with the “R” flag, “rsync,” and ”tar” commands, or a GUI method.
How to Loop Over the Lines of a File?
Use the “for” and “while” loops in the shell script to read the file content line by line. Both these loops provide simple syntax to perform this task easily.
How to Run a Shell Script in Background?
To run a shell script in the background, use the “&(ampersand)” bash control operator and the built-in “nohup” command line tool.
How to Create a Permanent Bash Alias?
To create a permanent bash alias, edit the “~/.bashrc” file in Linux. After that, reload it using the “source ~/.bashrc” command to activate newly alias.
[Fixed] “Hostname: Name or Service not Known” Error?
The error is caused when the user tries to change the hostname, which is not found in the /etc/hosts file, and it is fixed by adding the hostname to that file.
How to Use Undo Functionality in Nano?
Different errors can be made while editing a text file using nano; use the “ALT+U” key to undo the operations and “CTRL+E” to redo the changes made.
What is the Significance of the “wheel” Group in Ubuntu?
In Ubuntu, the “wheel” group is a special user group that provides administrative access to certain users on a system to perform administrative tasks.
How to Check Which Version of Apache is Running in Ubuntu?
To check the version of Apache running on a Ubuntu, use the “apache2”, “type”, “apt”, “apachectl”, and “tail” commands or web browser (GUI).
What Does “cp: omitting directory” Mean?
In Linux, the error “cp: omitting directory” represents that the “cp” command expects a file as the source, not a directory.
How to Check Hard Disk Performance on Linux?
In Linux, to check the hard disk performance of the system, the user can consider the utilities such as “hdparm”, “dd ”, “iostat”, or the “Disks” tool.
How to Find the PID of the Process Using a Specific Port?
In Linux, To find the process ID of the process using the specific port, use the “netstat”, “ss”, “losf”, or the “fuser” utility.
3 Best Free Photoshop Alternatives for Ubuntu and Other Linux
In Linux, the best alternatives to photoshop software are “Gimp”, “Krita”, and “Inkscape”, which give similar functionalities.
How to Check RAM Size Using CLI?
To check the RAM size in the Linux, utilize the “/proc/meminfo file”, “free”, “top”, “vmstat”, “dmidecode”, “lshw”, or “hwinfo” utilities
How to Create an Empty List in Python?
To create an empty list, the list() function and square brackets [ ] are used in Python. The nested empty list is created using the list comprehension method.
How to Python Check Version of Package With pip?
To check the version of the package with pip, the “pip show
Python String contains() | Explained
In Python, the “str.__contains__()” method is used to check the presence or existence of a specific string in the given string.
Bash if Loop Examples (if then fi, if then elif fi, if then else fi)
In bash scripting, the “if” loop is used to execute multiple conditional statements using “if-then fi”, and “if then else fi” and “if then else if fi” loop.
What is the Meaning of exit 0, exit 1, and exit 2 in a Bash Script?
The “exit 0”, “exit 1”, and the “exit 2” returns the exit status of the bash shell script. The value of the exit command is stored in the “$(shell)” variable.
What is “declare” in Bash?
In Bash, the “declare” command sets the variable and functions alongside their attributes, “integer”, “string”, “array”, and “read-only” variables.
How to Restart the SSH Service?
Linux offers the “systemctl” and “service” commands to restart the “SSH” service instantly. It can also be restarted by accessing the “/etc/init.d” directory.
How to Completely Remove Virtualbox From Linux?
In Linux, use the default package managers of Linux distribution, i.e., “apt(Ubuntu/Debian)” and “dnf(Fedora/CentOS/RHEL)” to completely remove the Virtualbox.
How to Find a File from any Directory?
In Linux, the “find”, “locate”, and “tree” commands can be utilized to find the file from the current or the particular directory.
How to Find the Correct php.ini File of Apache2 in Ubuntu?
In Ubuntu, the “ls”, “locate”, and “grep” command-line utilities can be utilized to get the absolute path of the “php.ini” configuration file.
How to Change IP Address on Linux?
To change an IP address, utilize the “ip”, “ifconfig”, and the “nmcli” command line tools or the “Network” window in the GUI method.
How to Make a for Loop in Command Line?
In Linux, the “for” loop executes the block of statements repeatedly for every item in a list. It offers two types of syntax, i.e., “generalized” and “one line”.
How to Find and Kill a Zombie Process on Linux?
To find and kill the zombie process on Linux, list down the zombie process, and send the SIGCHLD signal to its parent process.
How to Get the Complete and Exact List of Mounted File Systems in Linux?
To get the complete and exact list of the mounted file system in Linux, the built-in “findmnt”, “df” and “lsblk” utilities are considered.
Why Does Find -mtime +1 Only Return Files Older Than 2 Days?
The find -mtime +1 only returns files older than two days because it only returns the files modified in the last two or less than two days.
How to Export a GPG Private Key and Public Key to a File?
To export a GPG private and public key, use the “gpg –export-secret-key -a
How to Add a DNS Server Via resolv.conf?
To add a DNS server via resolv.conf configuration file, add a nameserver directive followed by the IP address of the DNS server.
How to Capture All the UDP Packets Using tcpdump?
To capture all the UDP packets using the tcpdump command, execute the “sudo tcpdump -i
How to Step Into, Step-over, and Step-out With GDB?
To step into, step over, and step out with GDB, use the “step”, “next”, and “finish” commands. These GDB commands quickly identify and fix bugs in the program.
Where are Apache File Access Logs Stored in Ubuntu?
In Ubuntu, the Apache access log files are stored in the “/var/log/apache2” directory. These files contain details of all the requests made to the web server.
How to Install and Run a TFTP Server?
To install and run the TFTP server, execute the “sudo apt install tftpd-hpa” command and configure the “tftpd-hpa” configuration file.
How can I Find My User ID (UID) from Terminal?
Linux and its distributions offer the pre-installed “id”, “echo”, “lslogin”, and “getent” command line utilities for finding user ID from the terminal.
How to Give Full Permission to Folder and Subfolder?
To give full permission to a folder and its subfolders, use the “chmod 777
