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ls - List directory contentspwd - Print working directorycat - Display file contentsmkdir - Create directoryrm - Remove filescp - Copy fileshead - Show first lines of filewc - Word count (lines, words, bytes)whoami - Show current usercd - Change directorygrep - Search for patterns in textchmod - Change file permissionsexport - Set environment variablestar - Archive utility (create/extract tar files)ps - List running processesdf - Show disk space usagesort - Sort lines of textcrontab - Schedule recurring tasksawk - Pattern scanning and processing languagefind - Search for files in directory treenetstat - Show network connections and portsdd - Convert and copy files (raw data)iptables - Configure Linux firewall ruleslsof - List open files (including network ports)ssh - Secure shell remote login