<p> ITU – UNIX Operating System Assignment #2</p><p>UNIX UTILITIES</p><p>1. Write a command to determine who is logged in on a specific terminal.</p><p>2. List some differences between pine and write. Describe a situation where it makes sense to use:</p><p> a) pine instead of write b) write instead of pine</p><p>3. Make a new copy of mars.txt called marsx. What happens if you give the following commands when the files bio and marsx both already exist? Don't guess, try it!</p><p> a) cp bio marsx b) mv bio marsx</p><p>4. Write a command to determine which utilities are available on your system for editing files. Is the command sed among them?</p><p>5. Write a command to determine whether the name “bob” is in the file “Addresses.”</p><p>6. Write a command to display the entire file “Addresses” in alphabetical order. </p><p>7. Use gzip to compress your bio file, and then compress a text file called “food.” What happens if you use diff to compare these two binary files that are not identical? When you are done, uncompress the two files.</p><p>8. Use man to determine what the grep command does for you. Report on your results.</p><p>9. The date command comes with an ability to format the output in different ways. Determined and explain the result of the following commands: date "+%D" date "+%H" date "+%D %H" date "+%b %B"</p><p>10. The echo command can be used with back quotes (under the ~ Character in upper left corner of keyboard). Determine and explain the result of the following commands: echo date echo `date` (notice both are ` -- back-quotes, not ' --single quotes) echo dats is `date` echo `$$$`</p><p>11. Determine and explain the result of the following commands: date ; who ( can you guess the effect of ";" here?) date; date "+%D" who ; whoami cal 2005; date</p>