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Unix

Unix
Which of the following signs is used to back up over typing errors in vi?

!
$
@
#
None of these

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Unix
Which of the following commands is used to obtain a list of all files by modification time?

ls -R
ls -i
ls -1
ls -t

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Unix
Which of the following commands is used to get directory one level up?

chdir
cd ..
None of these
cd
cd/

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Unix
Which of the following keys is used to replace a single character with new text?

S
s
R
r

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Unix
Which command is used to save the standard output in a file, as well as display it on the terminal?

tee
more
grep
cat
None of these

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Unix
The octal representation 652 indicates

None of these
All of these
Read and write permission of groups
Write permission for others
Execute permission for the owner

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