Unix

Basic Unix Commands 1. vi - vi command is useful to open any file and it will be useful to edit file. Usage:  vi filename 2. cd - cd means changing directory, cd is useful to enter into any directory. Usage: cd directoryname             cd directoryname/subdirectory 3. cat - if we would like display any content of a file we can use cat command, but it will display the content we can not edit the data like vi. Usage: cat filename 4. chmod - if you would like to change any file permissions we can use chmod command