If you are started learning Linux or any Linux distros (such as Ubuntu,Fedora etc) here is a list of top ten Linux commands for beginners.
Top Ten (10) Linux Commands For Beginners
grep command is used to search a string or word in a file. It searches for given arguments by users and return the matching lines.
Touch command is used in Linux, Ubuntu operating system to create empty files, changing or modifying the timestamp of existing files and directories.
In Linux OS every file has last access and modification time. You can check this through stat command or ll command.