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Consider the following command:
$ sleep 30 | cat /etc/services
Is there any output from sleep?
Where does cat get its input from?
What has to happen before the shell will display a prompt?
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- Explain the behavior of the following shell script: $ cat quote_demo twoliner="This is line 1. This is line 2." echo "$twoliner" echo $twoliner How many arguments does each echo command see in this script? Explain. Redefine the IFS shell variable so the output of the second echo is the same as the first. Add the exit status ofWhich command could you use to see a list of all environment and user-defined shellvariables as well as their current values?a. ls /varb. envc. setd. echoExplain the behavior of the following shell script: $ cat quote_demo twoliner="This is line 1. This is line 2." echo "$twoliner" echo $twoliner a.How many arguments does each echo command see in this script? Explain. b.Redefine the IFS shell variable so that the output of the second echo is the same as the first.
- Q1 What does the following command do? Please explain and run the command on your own system & provide an example of the results.┌──(kali㉿kali)-[~]└─$ uptime What does the option -s show in the following command? Please explain and run the command on your own system & provide an example of the results.┌──(kali㉿kali)-[~]└─$ uptime -s Q2What do the -b and -n 2 options do to the top command?Why were those options used in the Lab Mod 5 Lab A? ┌──(kali㉿kali)-[~]└─$ top -b -n 2What does the following command tell the shell to do? $ wc -l file[237ACks]Identify the errors with the following commands and indicate possible solutions. (Hint:Try typing them at a shell prompt to view the error message.)Echo “This command does not work properly”date –zapropos man –khelp dateshutdown –c nowecho “I would like lots of $$$”man 8 date
- Write a single command that would change the name of the date-now file to old-date and move the old-date file to the home directory of the TestAccount user.Which command entered without arguments is used to display a list of processes runningin the current shell?a. ppidb. listc. pidd. psIn Linux operating system: When writing shell scripts, we rely on the echo command to display output and prompt users for input. We know that the echo command will display exactly what we type on the command line unless we specify otherwise. What would be the command and option we would use to display what shell we are running followed by two newlines?
- Write a shell script named “myscript.sh” to do the following:● Write a suitable command to a user cron job, will run "backup.sh" script at 8 am every Friday.● Write a suitable command to display the list of all cron jobs and save in a text file “mycron.txt” in your current directoryWhat is the command one would run at a shell to change the current working directory to the parent directory? Assign this command as a string to a variable called answer. E.g., if you thought the answer was "do xyz 123" you should write: answer = "do xyz 123"A user typed in the command pwd and saw the output: /home/jim/sales/pending. Howcould that user navigate to the /home/jim directory?a. cd ..b. cd /jimc. cd ../..d. cd ./.