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tail: Displaying the End of Files and Real-time Monitoring
The tail command is used to display the last part of a file. It is commonly used to check the latest content of log files or to monitor file changes in real-time using the -f option. The -n option is particularly useful for specifying the number of lines to output, allowing you to view only a specific number of the last lines.
tar: Create and Extract File Archives
An essential tool used to bundle multiple files and directories into a single .tar file (archiving), or to extract files from an existing archive. It is frequently used with compression features like Gzip (-z) or Bzip2 (-j).
tcpdump: Network Traffic Dump and Analysis
tcpdump is a powerful command-line utility for capturing and analyzing TCP/IP and other packets transmitted over a network interface. It allows you to filter packets based on specific criteria, display them in real-time, or save them to a file for later analysis. It is widely used for network troubleshooting, security auditing, and application debugging.
tcsh: C Shell Compatible Shell
tcsh is a Unix shell that is compatible with the C shell (csh), offering enhanced features such as command-line editing, command history, aliases, and job control. It is primarily used as an interactive shell and has a scripting syntax similar to the C language.
tee: Send standard input to files and standard output simultaneously
The tee command is a utility that reads standard input, outputs it to standard output, and simultaneously writes it to one or more files. It is commonly used to check intermediate results in pipelines or to save data to multiple files at once. The -a option is used to append to files instead of overwriting them.
Complete Guide to the Telnet Command
`telnet` is a network protocol and command that allows you to connect to a remote host, open a terminal session, and execute commands. Due to security vulnerabilities, it is primarily used to check if specific ports on network devices are open. SSH (Secure Shell) is the modern secure protocol that replaces telnet.
terraform: Infrastructure Provisioning and Management
Terraform is an open-source Infrastructure as Code (IaC) tool developed by HashiCorp. It allows you to safely and efficiently provision and manage cloud and on-premises resources using code. You define your desired infrastructure state through declarative configuration files, and Terraform automatically plans and executes the steps to reach that state.
test: Evaluate Conditional Expressions
The test command is used to construct conditional statements in shell scripting. It evaluates various conditional expressions, such as checking file types or comparing string and numeric values, returning true (0) or false (1). This return value is utilized in control structures like the `if` statement.
time: Measure Command Execution Time and Resource Usage
The time command measures the time taken for a given command to execute and outputs a summary report of system resources used (CPU time, memory, etc.). It is useful for performance analysis and optimization of programs.
tmux: Terminal Multiplexer Guide
A powerful terminal multiplexer that allows you to manage multiple sessions, windows, and panes within a single terminal window, and to detach from sessions and reattach later.
Guide to the top Command: Real-time System Process Monitoring
`top` command (table of processes) is a tool used to monitor system process activity in real-time on Linux and Unix-like operating systems. It provides a dynamic overview of the current state of the system, including CPU usage, memory usage, and a list of running processes, making it essential for diagnosing performance issues and understanding resource usage. Through this guide, learn the basic usage and interaction features of the `top` command.
touch: Change file access and modification times or create a file
The touch command is used to update the access and modification times of a file to the current time, or to create a new empty file if the file does not exist. The -c option, in particular, is useful for preventing the creation of new files when they don't exist, allowing you to manipulate only the timestamps of existing files.