41) Write a command that will display files in the current directory, in a colored, long format.?
Answer: ls -l –color
42) Write a command that will find all text files in a directory such that it does not contain the word “amazing” in any form (that is, it must include the words Amazing, AMAZING, or aMAZINg)?
Answer: grep –vi amazing *.txt
43) Write a command that will output the sorted contents of a file named IN.TXT and place the output in another file named OUT.TXT, while at the same time excluding duplicate entries.?
Answer: sort IN.TXT | uniq > OUT.TXT
44) Write a command that will allow a UNIX system to shut down in 15 minutes, after which it will perform a reboot.?
Answer: /sbin/shutdown –r +15
45) What command will change your prompt to MYPROMPT: ?
To change a prompt, we use the PS1 command, such as this: PS1 = ‘MYPROMPT:’
46) What does this command do?
cat food 1 > kitty Answer: it redirects the output of cat food into the file kitty; the command is the same as: cat food > kitty
47) What is wrong with this interactive shell script?
echo What month is this?
read $month echo $month is as good a month as any. Answer: Initially, the question mark should be escaped (\?
) so that it is not interpreted as a shell metacharacter. Second, it should be read month, not read $month.
48) Write a shell script that requests the user’s age and then echoes it, along with some suitable comment.?
Answer: echo Hello! What\’s your age\?
read age
echo $age! I\’ll be obsolete by that age!
49) Write a script that prints out date information in this order: time, day of week, day number, month, year (sample output: 13:35:11 PDT Sun 10 Feb 2010)?
Answer: set ‘date’
echo $4 $5 $1 $3 $2 $6
50) Write a script that will show the following as output: Give me a U! U! Give ma a N! N! Give me a I! I! Give me a X! X!?
Answer: for i in U N I X do
echo Give me a $i!
echo $i! done
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Answer: ls -l –color
42) Write a command that will find all text files in a directory such that it does not contain the word “amazing” in any form (that is, it must include the words Amazing, AMAZING, or aMAZINg)?
Answer: grep –vi amazing *.txt
43) Write a command that will output the sorted contents of a file named IN.TXT and place the output in another file named OUT.TXT, while at the same time excluding duplicate entries.?
Answer: sort IN.TXT | uniq > OUT.TXT
44) Write a command that will allow a UNIX system to shut down in 15 minutes, after which it will perform a reboot.?
Answer: /sbin/shutdown –r +15
45) What command will change your prompt to MYPROMPT: ?
To change a prompt, we use the PS1 command, such as this: PS1 = ‘MYPROMPT:’
46) What does this command do?
cat food 1 > kitty Answer: it redirects the output of cat food into the file kitty; the command is the same as: cat food > kitty
47) What is wrong with this interactive shell script?
echo What month is this?
read $month echo $month is as good a month as any. Answer: Initially, the question mark should be escaped (\?
) so that it is not interpreted as a shell metacharacter. Second, it should be read month, not read $month.
48) Write a shell script that requests the user’s age and then echoes it, along with some suitable comment.?
Answer: echo Hello! What\’s your age\?
read age
echo $age! I\’ll be obsolete by that age!
49) Write a script that prints out date information in this order: time, day of week, day number, month, year (sample output: 13:35:11 PDT Sun 10 Feb 2010)?
Answer: set ‘date’
echo $4 $5 $1 $3 $2 $6
50) Write a script that will show the following as output: Give me a U! U! Give ma a N! N! Give me a I! I! Give me a X! X!?
Answer: for i in U N I X do
echo Give me a $i!
echo $i! done