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11. which of the following commands can be used to extract a tar file?
a. tar -vf
b. tar -xvf
c. tar -e
d. tar -v
12. which of the following commands can be used to create a tar archive file in verbose mode?
a. tar -v
b. tar -cvf
c. tar -c
d. tar -vf
13. in what file do you change default shell variables for all users?
a. /etc/bashrc
b. /etc/profile
c. ~/.bash_profile
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