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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.

The grep command is used to find the information for multiple strings in any file or directory that you are looking for in Linux.

The grep command allows users to find or sort data according to syntax matches. This article covers the detail on how to exclude in grep.

The grep command can be used to find the words in the files of Linux. The words can be found in the current directory and its sub-directories.

To execute the grep command to search through all the files in a directory, you need to navigate to the directory or enter the exact path and use the “*” sign.

The existing username in Linux can be changed with the help of the built-in “usermod” command that also changes the user’s home directory.

The & ampersand operator and && AND operator in Linux commands are used to run processes in the background or in a conditional way.

To find all the files containing the specific text or string on Linux, use the grep command with its “rnwe” options. Also, the ack and rg commands can be used.

To delete the exported environment variable in the Linux shell, use the unset command. To use it, open the terminal and run “unset [variable name]”.

To search for Debian’s packages, use any of the commands from apt, apt-file, apt-cache, aptitude, dpkg, dlocate, and snap.

An exit code of “2” means the program or command could not execute successfully. It usually occurs when the command syntax needs to be corrected.

Linux offers the “Smartctl”, and “nvme-cli” command line tools and “Disks” application in GUI to test the health of SSD/HDD.

To find all SSH login attempts, use the “grep,” “journalctl,” or the combination of “cat” and “egrep” commands with the “/var/log/auth.log” file.

To uninstall a .deb installed package with dpkg, use the “sudo apt -remove ” and “sudo dpkg -remove ” commands in Linux.

The sshd Logs are stored in the “/var/log/auth.log” file. These log details can be displayed using the “grep”, “lastlog”, and the “journalctl” commands.

The “lrwxrwxrwx” permission specifies that the symbolic link to another file has read, write, and execution permissions to all its users and groups.

In Linux, use the WPA_Supplicant to connect with the Wi-Fi networks. Also, establish connections with hidden, insecure networks and WEP routers.

To view all UUIDs for all available disks on the Linux operating system, use the “blkid”, “lsblk”, “ls”, “hwinfo”, “udevadm”, “tune2fs”, “dumpe2fs” commands.

In Linux, the user can use the “nmap”, “netstat”, “netcat”, “/dev/tcp” or “lsof” tools as an alternative besides the “telnet” tool.

To check the RAM size in the Linux, utilize the “/proc/meminfo file”, “free”, “top”, “vmstat”, “dmidecode”, “lshw”, or “hwinfo” utilities

To find and kill the zombie process on Linux, list down the zombie process, and send the SIGCHLD signal to its parent process.

Linux and its distributions offer the pre-installed “id”, “echo”, “lslogin”, and “getent” command line utilities for finding user ID from the terminal.

To run the SSH server on a port other than 22 is possible by changing the port number in the “sshd_config” configuration file

Linux and its distributions offer the “getent”, “groupmems”, “members”, and “libuser_lid” command line utilities for listing the group members of a group.

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.

The “/dev/null” is a powerful tool in Linux that allows users to discard unwanted data, suppress error messages, make files disappear, and many more.

In Linux, the VMware workstation is removed by the “vmware installer” Script. Furthermore, it can also be removed manually from the system.

To change the MTU size instantly in Linux, the ip, and ifconfig commands and to make them permanently make changes in the network configuration file.

Learn where and how passwords are securely stored on Linux systems and secure your system most effectively and possibly.

To show the PATH of an environment variable, execute the “echo”, “cat”, “env”, “set”, and “printenv” commands with the “PATH” variable.

The “utmp”, “wtmp”, and “btmp” files store the info of currently logged-in users, historical logs of all logins and logouts, and the failed login attempts.

In Linux, to list down the USB devices, use the “lsusb”, “dmesg”, “usb-devices”, “lsblk”, “df”, or “fdisk” utility in the terminal.

Linux offers the pre-installed “df”, “lsblk”, “fsck”, “file”, “mount”, and “blkid” commands to determine the file system type of mounted devices/partitions.