Drugie_21

chown apache: apache -R /var/www recursively sets the owner to all files and directories under /var/www/ to apache and the group ownership to apache (This would include the www directory itself).

True

How would you dump the contents of the /var/log/messages file into standard output, grep for all lines that contain "Memory" and then redirect the grep'ed result to /home/user/log. txt?

cat /var/log/messages | grep -i memory > /home/user/log. txt

You need to search for man pages that relate to the postfix service. Which command will do this?

whatis postfix, apropos postfix

How would you append the text "service=on" to the /etc/motd file?

echo "service=on" >> /etc/motd

You need to set the execute bit on the finance directory and any subdirectories it might contain, but not on the files within them. This change must apply to all users. What methods might you use?

chmod a+X -R finance, chmod -R a+X finance

Which directory contains the info files from which the info program reads?

/usr/share/info

Display first ten lines of the file

head

Display first fifty lines of the file

head -n 50

Display last ten lines of the file

tail

Add next line to the file i.e. to /varlog/messages when new log comes

tail -f /var/log/messages

Display all lines starting with #

grep '^#'

Display a word with either capital or small letter

grep -i <word>

Search and display word in a file

grep 'user' /etc/passwd

Search and display everything but the word in the file

grep -v 'slowo' /etc/passwd

Find a word in results of dmesg command

dmesg | grep slowo

Find a line in a file where 'word' is at the end on the line

grep 'word$' /etc/passwd

Find lines starting and ending with linuxacademy

grep -I '^linuxacademy&' /etc/passwd

Find a line without letters o and a

grep '[^oa]' /var/log/messages

Regular expression -?

Item is optional

Regular expression - +

Item exists once or more times in line

Fine a latter which appears once or more in the line

grep -E '(a)+' <filename>