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ls command | 
How to List Files and Directories in Linux – {15 Examples} | 
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pwd command | 
How to Check Current Working Directory in Linux – {15 Examples} | 
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cd command | 
How to Change Current Working Directory in Linux – {15 Examples} | 
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clear command | 
How to Clear Terminal Screen in Linux – {4 Examples} | 
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mkdir command | 
How to Create Directories in Linux – {6 Examples} | 
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mv command | 
How to Move or Rename Files and Directories in Linux – {9 Examples} | 
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cp command | 
How to Copy Files and Directories in Linux – {14 Examples} | 
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rmdir command | 
How to Remove Empty Directories in Linux – {5 Examples} | 
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touch command | 
How to Change or Modify Timestamps of File or Directory – {8 Examples} | 
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cat command | 
How to Print or View Contents of File in Linux – {13 Examples} | 
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echo command | 
How to Print Line of Text or String in Linux – {15 Examples} | 
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less command | 
How to Read Contents of Text File in Linux – {6 Examples} | 
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tar command | 
How to Create and Extract Tar Archive Files in Linux – {21 Examples} | 
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gzip command | 
How to Use the Gzip Command in Linux – {13 Examples} | 
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grep command | 
How to Search Text or String in Files on Linux – {12 Examples} | 
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head command | 
How to Print First 10 Lines of Files in Linux – {6 Examples} | 
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tail command | 
How to Print Last 10 Lines of Files in Linux – {6 Examples} | 
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cut command | 
How to Cut Sections of Line in File – {8 Examples} | 
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tee command | 
How to Use ‘tee’ Command in Linux – {8 Examples} | 
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sort command | 
How to Sort Files Based on Sizes in Linux – {14 Examples} | 
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uniq command | 
How to Remove Duplicate Lines in Linux – {8 Examples} | 
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ps command | 
How to List Currently Running Linux Processes – {30 Examples} | 
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kill command | 
How to Kill a Running Linux Process – {4 Examples} | 
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df command | 
How to Check Disk Usage of Linux File System – {12 Examples} | 
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chown command | 
How to Change File Owner and Group in Linux – {11 Examples} | 
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ifconfig command | 
How to Configure Network Interface in Linux – {15 Examples} | 
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ip command | 
How to Configure Network Interface in Linux – {24 Examples} | 
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wget command | 
How to Download Files from Network in Linux – {10 Examples} | 
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curl command | 
How to Transfer Data From or To a Server in Linux – {15 Examples} | 
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apt command | 
How to Install Packages in Debian-based Systems – {15 Examples} | 
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apt-get command | 
How to Manage Packages in Debian-based Systems – {25 Examples} | 
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yum command | 
How to Install Software Packages in RHEL-based Systems – {20 Examples} | 
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dnf command | 
How to Install Software Packages in Fedora – {27 Examples} | 
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rpm command | 
How to Install RPM Packages in RHEL-based Systems – {20 Examples} | 
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alias command | 
How to Create and Use Alias Command in Linux | 
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dd command | 
How to Learn dd Command in Linux – {15 Useful Examples} | 
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top command | 
How to Monitor Running Linux Processes – {16 Examples} | 
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useradd command | 
How to Create New Users in Linux – {15 Examples} | 
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sleep command | 
How to Use “sleep” Command in Linux – {6 Examples} | 
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screen command | 
Getting Started with Linux Screen Command – {20 Examples} | 
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pv command | 
How to Monitor Progress of Data in Linux | 
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fgrep command | 
How to Use fgrep Command to Search for Strings in Linux – {12 Examples} | 
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dir command | 
How to Create New Directories in Linux – {8 Examples} | 
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egrep command | 
How to Search Patterns in Files in Linux – {20 Examples} | 
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ssh command | 
Basic SSH Command Usage and Configuration in Linux | 
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fd command | 
A Simple and Fast Alternative to Find Command | 
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lsof command | 
How to List Open Files in Linux – {10 Examples} | 
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dig command | 
How to Query DNS in Linux – {10 Examples} | 
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nslookup command | 
How to Query Internet Domain Name Servers – {8 Examples} | 
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du command | 
How to Find Disk Usage of Files and Directories – {10 Examples} | 
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tree command | 
How to List Directory in Tree-like Format in Linux – {12 Examples} | 
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ss command | 
How to Monitor Network Connection Statistics in Linux – {12 Examples} | 
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partx command | 
How to List Disk Partitions in Linux – {8 Examples} | 
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uptime command | 
How to Check the Running Time of Linux System | 
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tr command | 
How to Translate or Delete Characters in Linux – {10 Examples} | 
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ping command | 
How to Check Network Connectivity Between Hosts in Linux – {12 Examples} | 
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zcat command | 
How to View Contents of Compressed File in Linux – {6 Examples} | 
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xargs command | 
How to Build and Execute Commands from Standard Input – {12 Examples} | 
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rm command | 
How to Delete Files and Directories in Linux – {8 Examples} | 
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stat command | 
How to Check File or File System Status in Linux – {5 Examples} | 
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who command | 
How to Check Who is Logged-On in Linux – {10 Examples} | 
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locate command | 
How to Find Files by Name in Linux – {10 Examples} | 
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host command | 
How to Find IP Address of Domain Name in Linu – {13 Examples} | 
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find command | 
How to Find Files and Directories in Linux – {35 Examples} | 
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fuser command | 
How to Find PIDs of Processes Using Files or Sockets in Linux – {4 Examples} | 
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at command | 
How to Schedule a Command on Particular Time in Linux | 
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fdisk command | 
How to Create and Manage Disk Partitions in Linux – {10 Examples} | 
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parted command | 
How to Create, Resize, and Rescue Disk Partitions in Linux – {8 Examples} | 
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wc command | 
How to Count Number of Lines, Words, Characters in Linux – {6 Examples} | 
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dpkg command | 
How to Manage .deb Packages in Debian-based Systems – {15 Examples} | 
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nmap command | 
A Network and Security Auditing Tool for Linux – {29 Examples} | 
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dmesg command | 
How to Troubleshoot and Collect Information of Linux Systems – {7 Examples} | 
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chattr command | 
How to Make Important Files IMMUTABLE in Linux – {5 Examples} | 
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usermod command | 
How to Modify User Accounts in Linux – {15 Examples} | 
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free command | 
How to Check Memory Usage in Linux – {10 Examples} | 
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cron command | 
How to Check Memory Usage in Linux – {11 Examples} | 
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mysql command | 
How to Backup and Restore MySQL Databases in Linux – {20 Examples} | 
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sdiff command | 
How to Check Difference Between Two Files in Linux – {11 Examples} | 
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history command | 
How to View Previously Executed Linux Command – {10 Examples} | 
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netstat command | 
How to Check Network Listening Ports in Linux – {20 Examples} | 
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sftp command | 
How to Securely Transfer Files Between Linux Systems – {10 Examples} | 
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tcpdump command | 
How to Analyzer Network Packets in Linux – {12 Examples} | 
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scp command | 
How to Copy Files and Directories Between Remote Linux – {10 Examples} | 
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rsync command | 
How to Sync Files and Directories Between Remote Linux – {10 Examples} | 
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fsck command | 
How to Repair File System Errors in Linux | 
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bc command | 
How to Do Basic Calculations in Linux – {10 Examples} | 
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chage command | 
How to Manage User Password Expiration and Aging in Linux – {5 Examples} | 
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ffmpeg command | 
How to Convert Video, Audio, and Image in Linux – {15 Examples} | 
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mknod command | 
How to Create Device Files in Linux – {5 Examples} | 
 
The dd command is what got me hooked on Linux when I was transitioning from AIX and OS/2 Warp v4 to Linux. That is how I burned my first iso image to a CD-ROM now I use a USB flash memory stick.
Where /dev/sda is the USB port the USB memory stick was inserted into as seen by the last lines of the “sudo dmesg” command.