CS170 I/O Redirection and Lab Exercise

I/O Redirection, Pipes, and Sort

• Use the Unix cal command to show the birthmonth of the year you were born. When you do that, use the I/O redirection operator ">" to send the output to a file called "months". i.e. type the following command: cal mm yyyy > months
  (Replacing mm yyyy with the the number of your birthmonth and year.)

• Repeat that last command exactly to see what happens.

• Now use the command for this year's month of your birth and append it to the "months" file you just created. (Remember that the append operator is ">>".

• Use the command one more time, specifying just the current year, (no month) and append that output to your "months" file.

• To see what is in "months", you could enter cat months, but there could be too many lines for the screen to display at one time. What you should do is direct the output of cat to the input of the more command. Use the pipe symbol "|" to do this.
  i.e. cat months | more

• You can type the Unix command who to see who is logged on.
  
  How can you redirect the output of who to a file? __________________________________
  
  How can you redirect the input of sort from that file? __________________________________
  
  How would you use a pipe to combine those last 2 steps? __________________________________
  
  How would you redirect the output of the last step to another file? __________________________________
  
  You can expect questions like this on the lab test.

Cleanup