The following are the most commonly used command in Linux.

• ls – list the files and directories in the folder
• ls -a List all files and directories along with hidden files
• ls -l List all files and directories in long format
• ls -lh List all files and directories with size in human readable format
• ls -t Sort by time (newest first)
• ls -t Sort in reverse order (oldest first)
• ls -lrth – list the files and directories in the folder in long format and sorted reverse by time, and size in human readable form
• man command To see manual for a particular command (Eg: man ls)
• cat /path/to/filename Read the file
• grep -rni 'search string‘ Search for the string within all files in current directory
• grep -rni '/path/to/filename.txt' Search for string in the particular file
• file ./ -name '*string*' Search for the file name
• history Prints the previously used commands

Shortcuts in terminal

• Ctrl + R – Search previous commands
• Ctrl + W – Delete a word
• Ctrl + right arrow – Move the cursor by word right side
• Ctrl + right arrow – Move the cursor by word left side
• Up arrow – Show the previously used command

PS: The above command and shortcuts are mostly used by me, this blog I wrote to keep note of the same for my personal use and might be useful for someone.