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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 ...

RabbitMQ Command-Line Operations Guide =========================================================================================================== Creating an admin user and assigning permissions rabbitmqctl list_users rabbitmqctl add_user admin admin rabbitmqctl set_permissions -p / admin ".*" ".*" ".*" rabbit ...

Extracting individual frames from video files requires precise control over decoder initialization and timestamp seeking. The positioning of the seek flag directly dictates whether the process completes in milliseconds or requires full sequential decoding. Output format selection impacts both file size and processing overhead. Specifying -c:v m ...

Command Structure The find command syntax consists of three primary components: find /etc -name "passwd" The first segment is the commmand itself, followed by the target directory path. Multiple paths can be specified: find /etc /var /usr -name "passwd" The third segment contains expressions that define search criteria and ...

The find Command The find command is a powerful utility for locating files within a directory hierarchy. Available on Unix, Linux, and macOS systems, it supports various search criteria including filename patterns, file types, modification times, and permisions. Basic Syntax find [path] [expression] The command traverses the specified director ...

Comprehensive Reference Documentation (man) The man command accesses the system's manual pages, offering deep technical details regarding commands, kernel interfaces, configuration formats, and system calls. It is the primary resource for authoritative information within a Linux environment. Manual Sections Overview Manual pages are organized i ...