Save the output of the who command in the who.log file and run the following command on your system. What does this command do? Explain your answer. You must have the who.log file in your current directory for the command to work properly.
What will be an ideal response?
uptime | cat - who.log >> system.log
The output of the uptime command and the content of the who.log file are appended to the current contents of the system.log file. (The cat - command can be used to take input from standard input.) If who.log does not exist, the cat command displays the error message cat: cannot open who.log.
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