Question

Please write the Linux commands and run them.

h. What is the command or commands that would list the contents of the /var/log directory in alphanumeric order? List the command and its output.

i. What is the command or commands used to list the files in /var/log in order of their size? List the command and its output.

j. What is the command or commands used to list the top 10 file who use the most disk space? What is this command(s) and show its output?

k. What is the command that will show you the last 15 commands you have typed? List the command and its output.

l. What is the difference between the commands less and more?

Answer 1

h)  list the contents of the /var/log directory in alphanumeric order:

ls  /var/log | sort -f (sorts alphabetically)

i)  list the files in /var/log in order of their size

ls -lS /var/log ( lists all files by size)

j) list the top 10 file who use the most disk space

du -a / | sort -n -r | head -n 10 (lists top 10 files with most disk space)

k) last 15 commands you have typed

fc -lrn -1 -15 (lists last 15 commands that we typed)

l) difference between the commands less and more

more :  more is an old utility. When the text passed to it is too large to fit on one screen, it pages it. You can scroll down but not up.

ex: ls | more

less :  less overcomes more's inability to scroll backwards through a file.

ex: ls | less