James F Sloan III
4/2/15
IT250
Chapter 5 1. The “who” command helps you determine who is logged in on a specific terminal. 2. Give the command “mesg n” to keep other ordinary users from writing to your terminal. You can take this action when you do not want to be disturbed or are viewing something on your screen that you do not want overwritten. 3. $ cp to_do done – it will overwrite the done file with the new file names to_do.
$ mv to_do done- it will do the same as cp, the to_do file will overwrite the done file. 4. Give the command apropos editor. Most systems have vim, ex, ed, and more. 5. $ grep "Ace Electronics" phone
$ sort phone
$ uniq phone 6. When you compare binary files with diff, diff displays a message saying the files differ when the files differ or no message when the files are the same. The diff utility compares ASCII files on a line-by-line basis; it is not designed to compare binary files on a byte-by-byte basis. Use cmp to compare binary files in that manner. 7. The answer is system dependent. 8. The utility displays a message saying that the command you are looking for is not in the list of directories that are in your search path. For example,
$ which me /usr/bin/which: no me in (/usr/local/bin:/bin:/usr/bin:/usr/X11R6bin:. 9. No. However, some commands that are built into a shell have an executable counterpart that exists as a file (for example, echo). 10. Approximately twenty, not counting files that you cannot read as a nonprivileged user. 11. $ head status.report
$ tail status.report