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1. command is to view an entire text file on the terminal screen (also referred to as concatenation)
5. for UNIX operating systems.
7. editor is one of the oldest and most popular visual text editors avail-
8. command searches for text characters in a binary file and outputs them to the screen.
9. command displays all the files in the current directory in columnar format
10. command displays the first 10 lines (including blank lines) of a text file to the terminal screen but can also take a numeric option specifying a different number of lines to dis- play.
12. command to display additional details for a file, including the date and time a file was created (the birth time), as well as the last time the file was accessed, or its contents modified, or file information changed.
13. which displays the contents of the file in octal format (numeric base 8 format)
15. command to view files and subdirectories under a directory, you can add the recursive (–R) option to the to the ls command, or use the
16. command is used to display line in a text file that match a certain common regular expression

1. command change directories, you can issue the change directory command with an argument specify-ing the destination directory.
2. command can be used to display the end of text files.
3. command is named for doing more than the more command (remember that “less is more,” more or less).
4. also known as folders
6. command does not interpret any regular expressions and consequently returns results much faster.
9. command is named for doing more than the more command (remember that “less is more,” more or less).
11. command to identify the content differences between two text files, which is often useful when comparing revisions of source code or configuration files on a Linux system
14. command is use to display lines of text that match extended regular expressions