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fg: Bring Background Jobs to Foreground
The `fg` command is used to bring a job running in the background or suspended to the foreground, reactivating it. It is useful when you need to see the job's output in the terminal or regain user input.
fgrep: Fixed String Search
fgrep is a command-line utility that searches for fixed strings within files. It is equivalent to grep -F and can be faster than grep for literal string searches because it avoids the overhead of regular expression parsing.
file: Guide to Identifying File Types
Determines the type and MIME information of files by examining their actual byte content instead of relying on extensions. It uses the libmagic database.
Mastering the find Command
This is a guide to the `find` command, which is used to search for files and directories within the file system in Linux. You can efficiently find the files you want by combining various conditions and actions.
findmnt: Check Mounted File System Information
The findmnt command displays information about mounted file systems on the current system, either in a tree format or as a list. You can filter by specific file systems, mount points, devices, etc., to view detailed information.
firewall-cmd: Managing Firewalld Firewall
firewall-cmd is the command-line client for the firewalld daemon. It allows you to dynamically manage your system's firewall rules. You can perform various firewall operations such as opening ports, adding services, and configuring network zones, and apply rules for both runtime and permanent configurations.
firewalld: Dynamic Firewall Service Management
firewalld is a dynamic firewall management daemon for Linux systems. It allows for easy management of firewall rules using the concept of network zones, and enables rule changes even while services are running. It serves to replace or complement existing iptables.
flush: Flush Network Addresses and Routes
`flush` is primarily used as a subcommand of the `ip` utility to clear IP addresses, routing tables, and caches of network interfaces. This is useful for removing old information or resolving issues after network configuration changes. The `ip` command is part of the `iproute2` package.
fmt: Format Text Paragraphs
The fmt command is used to reformat paragraphs of text files or standard input, adjusting line breaks to fit a specified width. It is particularly useful for improving the readability of emails, code comments, and plain text documents.
fold: Text Wrapping and Line Limiting
The fold command is used to wrap each line of input text to a specified width. It is useful for making long text files more readable or for processing text in environments with specific width limitations.
free Command Guide: Check System Memory Usage
The `free` command is used on Linux systems to display the total amount of available physical memory (RAM) and swap memory, along with their usage and free space. It is an essential tool for system performance monitoring and troubleshooting. Through this guide, learn how to easily check memory information using various options of the `free` command.
fsck: File System Consistency Check and Repair
The `fsck` command is used to check the consistency of a file system and repair damaged parts. It can also run automatically to prevent file system corruption when a system shuts down abnormally. It is primarily used for troubleshooting boot issues or checking for disk errors.