need some help with Linux Operation Systems.
1. What command(s) would you use to extract all of the usernames from a database called /etc/passwd and then sort this output alphabetically in reverse order?
How would you run this same command and have the output saved in a file called System_Users?
2. Which command would you use to extract the first 15 characters in each line of the /etc/passwd file?
3. What command would you use to find all empty (0 byte) files in the /etc directory? How could you run the same command and not have any error messages show up on the console?
4. What command would you use to find all files in your home directory that are owned by the sysadmin user?
5. What command would you use to find all the instances in which the word "host" is used in the /etc directory and show this information one screen at a time?
6. What command would you use to determine the number of lines and words in the /etc/mailcap file?
7. What command would you use to view only the first seven (7) lines of the /etc/mailcap file?