How to Kill a Process From the Command Line?
From the command line, you can use the “kill” and “pkill” commands to kill the running process by specifying the ID and name, respectively.
From the command line, you can use the “kill” and “pkill” commands to kill the running process by specifying the ID and name, respectively.
The “stat”, “ls” and “find” commands are used to find the mtime of files in Linux. They display the modification time when the file’s content is modified.
Linux provides the “nano” and “vim” text editors to edit or modify the host or any other file using the “sudo” privilege. It is easy to access and use.
In Bash, the until loop iterates the code until the specified condition is met. Using the until loop, users can modify conditions according to requirements.
After accessing the “/proc/sys/vm/swappiness” file, you can change the swappiness value using “sudo” privileges that will apply to the operating system.
Linux offers the “history” utility with the “-c” option and “-w” option to clear the current session’s command history and all previous session history.
Linux offers the “tmpfs” and “/etc/fstab” files to create a ramdisk in the operating system. It is useful for storing and accessing data.
CentOS offers the “lsb_release”, “hostnamectl”, and “uname” commands to check the CentOS version. Also, the “centos-release” file contains version information.
Linux offers the “ps-ef” command that lists out the running processes with the command line arguments passed to the process.
Sort output from largest to smallest by a combination of “du” and “sort” commands with the “h” option. It displays output in a human-readable format.
Linux offers a “more” command that allows you to view the contents of a text file or output one page at a time. The syntax with multiple examples is given here.
The cron jobs are scheduled by following the five asterisks pattern. Each asterisk denotes a time (minute, hour, day of the month, month, day of the week).
To check the available packages in the Yum package manager, the “yum list” and “yum info” commands are utilized in Linux System.
In Linux, the “ls” command works with “-l” and “-h” options to display the list of file sizes in a long and human-readable format, respectively.
In Linux, the “free”, “top”, and “htop” commands are used to check the usage of RAM in the system. The “/proc/meminfo” file also contains RAM information.
Linux offers the “fdisk” command to create, delete, and modify the partition in the system. It requires the name of a hard disk to display information.
For testing purposes, telnet is used with the domain name by specifying the port number to ensure the specific port is open and reachable on a remote machine.
In Linux, the “known_hosts” file contains the host keys of remote servers. Each key is associated with the server address that is used for authentication.
The “cURL” command sends the POST data from a file with the “-d” option. It requires the path to the file that contains the POST data.
In Linux, the “rsync” command is utilized to transfer files between remote and server systems over SSH by specifying the
In Linux, the “ftp” command is utilized to transfer files between remote systems after establishing the connection through “ftp
In Ubuntu, the “sudo apt upgrade” script is used to install updates via the command line after downloading all the latest versions of the required packages.
To display the list of containers in docker, run the “sudo docker container ls -a” command. It displays the information of the running container in the system.
First, change the port number from the file “sshd_config” and then use the syntax to transfer files/directories through SCP.
In Linux, the “PrtScr”, “Alt+PrtScr”, and “Shift+PrtScr” keys and third-party tools (Flameshot and Kazam) are used to take a screenshot.
The symlink of a directory is created by following syntax
In Linux, the “plt.show() not working” can be fixed by executing the “sudo apt install python3-matplotlib” script in the terminal.
In Linux, the error “pip importerror: cannot import name main” fixes by installing or upgrading the “pip” package manager.
To fix the “ssh permission denied (publickey)” error, disable the password authentication in the SSH configuration file, and add the SSH key to the server.
To enable the playing mode of DVD, your Ubuntu system must be equipped with a media player and the “libdvd-pkg” which contains all the required codecs.
To list all the cronjobs, use the command “crontab -l”. To list specific cron jobs, use the command “ls -la /etc/cron.hourly/daily/weekly/monthly”.
Docker provides the “docker attach” and “docker exec” commands to establish the connection with the running containers specifying the container name.
To check crontab services, “status” utility, “ps aux”, “pgrep”, and “tail” commands are used. It provides currently active/dead running processes in the system.
In Linux, the “chattr” command is utilized to change the existing attributes of a file such as “i” for immutable, “a” append mode via “+”, “-” operators.
In Linux, the “/etc/shadow” file contains the password information, including “Username”, “Password”, “Password Age”, and “Password Validity”.
The /etc/passwd file holds the information of “Username”, “Password”, “UID”, “GID”, “GECOS”, “Home directory”, and “Login shell” of the system and normal users.
The “cannot create directory permission denied” can be resolved by “allowing the write permissions”.The permissions are changed using the “chmod” command.
To fix the error, either import the public key, which is missing or re-import the expired public key. Read out this post for detailed information.
The error “tar not found in archive” is fixed by following the syntax correctly alongside the target directory name and its position in the syntax.
The error “sudo apt-get command not found” can be fixed by downloading the latest APT package manager to install, remove or update packages in the system.
The error “no server suitable for synchronization found” resolves by installing the “ntpdate” package via the package manager of the Linux distro.
The error “no module named pkg_resources” can be resolved by installing the python package via “sudo apt install python-pkg-resources”.
The error “import error no module named the image” resolves by installing the image module or installing the “Pillow” library in the system.
In Linux, the “find” and “tree” commands are used to search files recursively in subdirectories along with different file formats and sizes.
The error “windows subsystem for linux has no installed distributions” can be resolved through the “wsl –install –d Ubuntu” command.
The “SyntaxError: break outside loop” occurs when a user tries to use the “break” statement outside the loop and within the “if” statement in Python.
In Linux, the “unlink” command removes the file and link after accessing the required directory. It is useful to remove unnecessary files from the system.
The existing file can be saved by pressing the “Ctrl+S” key in Nano Editor. Also, the “Ctrl+O” key overwrites the file with a different name or file format.
In Ubuntu, connect the WiFi network through the “nmtui” and “GUI” methods. Both methods require SSID and passwords of a particular internet connection.
In Linux, the “sudo” command is utilized with “- s”, “su -” and “-i” utilities to grant the root privileges from a normal user after authentication.
The error “segmentation fault (core dumped)” is fixed by removing the “lock” files, killing the process via PID, removing cache, repairing the broken packages.
In Linux, the grep command is utilized to highlight (shows the match) the specific word, character, or string after searching the entire content in a file.
In Linux, the “ssh no route to host” error is fixed through the “ping” command, updating firewall rules for Port 22, and installation of the “OpenSSH” utility.
In Linux, the “ssh host key verification failed” error can be fixed by deleting the host key through Nano Editor or using the “ssh-keygen” command.
In Linux, the “importerror: no module named ‘matplotlib’” can be resolved by executing the “sudo apt install python3-matplotlib” command in the terminal.
Run the Java program by executing “javac
The “rsync” command works with the “exclude” keyword to prevent the files and directories from moving from one directory to another.
The error “waiting for cache lock ubuntu var/lib/dpkg/lock-frontend” occurs due to the involvement of the dpkg package manager in another running process.
To resolve the error “usr bin python no module named pip”, execute the “
In the Linux system, the “sudo: unable to resolve host” error can be resolved by configuring the hostname properly (either to change it or use it correctly).
The error “export ld_library_path” can be encountered by setting the environment variable to the “/usr/local/lib” directory.
In Linux, the “+”, “+=”, “Prefix”, and “Postfix” operators are used to increment a variable in bash. The bash can be executed as “bash
In Linux distributions, you can delete the non-empty directory by executing the “sudo rm -r
The “pkill” command kills the execution of currently active processes in linux such as “-f” (full process name), “-o” (oldest process), “-n”(newest process).
In the terminal, the “touch”, “echo”, “nano”, and “printf” commands are used to create an empty file specifying the file name.
The error “ssh_exchange_identification read connection reset” can be resolved by specifying the IP address or hostname by modifying the firewall rules.
The “postgresql password authentication failed for user” error can be resolved by changing the encryption method from “md5” to “trust”.
The “rm -r dir_name” command removes the directory and all its content from Linux. The “rmdir” command will not delete non-empty directories.
To check the current version of WSL, the “wsl –list –verbose” or “wsl -l -v” command is utilized in the Windows Command Prompt.
To fix the “end of central directory signature not found” error, extract the zip file through an alternative utility or correct the path directory.