Freaks City

Copying a Directory with Progress Indicator To duplicate a directory and its contents to a new location, use the cp command with the recursive flag. This ensures all files and subdirectories within the source folder are copied to the destination. The pv (pipe viewer) utility provides a visual progress bar for data transfers. When combined with ...

ulimit is a built-in shell command in Linux that manages resource limits for shell processes and their children. It controls constranits like maximum open files, memory usage, and core file sizes. The syntax includes options such as -a to display all current limits, -c for core file size in blocks, -d for data segment size in KB, -f for file si ...

Command Mode Fundamentals Vim's efficiency stems from its ability to execute commands with repetitions and precise movements. In command mode, prefixing a command with a number repeats it that many times. Movement commands can be combined with editing operations for rapid navigation and modification. Basic Movement Mastering cursor movement is ...

For newcomers to Rust, after setting up the development environment, the next step is to become familiar with the tools. Having effective tools will significantly accelerate the learning process. The principle of "to make good work, one must first sharpen one's tools" applies here. As a beginner, the ability to execute a single Rust s ...

Positional Parameters Positional parameters allow scripts to accept command-line arguments: $0 - Name of the currently executing script $n - nth argument passed to the script (use braces for n > 10, e.g., ${10}) $# - Number of arguments passed to the script $* - All arguments as a single string $@ - All arguments as separate string ...

Modifications in pg_dump PostgreSQL 12 expands the capabilities of the pg_dump utility through additional command-line switches designed for flexible data recovery. Revised Parameters Parameter Functionality --on-conflict-do-nothing Attaches an ON CONFLICT DO NOTHING directive to INSERT statements. Requires enabling --inserts or --column ...

Script Structure and Execution Shell scripts require a shebang line at the beginning to specify the interpreter: #!/bin/bash #!/usr/bin/python3 Comments use the # symbol and are single-line only. To execute a script: chmod +x script.sh ./script.sh Input and Output Reading input with read: read input_var read -p "Enter value: " pro ...

File Operations: Copy, Move, and Delete In Linux systems, the fundamental commands for file manipulation are cp (copy), mv (move), and rm (remove). ### Copy Command (cp) The cp command follows this syntax: ``` cp [-adfilprsu] source_file destination_file cp [options] source1 source2 source3 ... directory Key parameters include: - `-a`: Archive ...

Whenn managing remote terminal servers, administrators often need to perform user session management tasks such as logging off speicfic users. The traditional approach involves using quser to retrieve session information and logoff to terminate sessions: quser /server:SERVER_NAME logoff SESSION_ID /server:SERVER_NAME Like many legacy command-l ...

# Print the last line of a file sed -n '$p' ok.txt # Output total number of lines sed -n '$=' ok.txt # Count blank lines sed -n '/^$/=' ok.txt Line Selection and Printing # Print odd-numbered lines (1st, 3rd, 5th, ...) seq 10 | sed -n '1~2p' # Print even-numbered lines (2nd, 4th, 6th, ...) seq 10 | sed -n '2~2p' Inserting Content sed '5 a ...