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Unix

Unix
Which of the following is not a communication command.

write
mail
grep
mesg

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Unix
The UNIX file system stores a date in physical blocks of

512 bytes
2048 bytes
None of these
1024 bytes
256 bytes

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Unix
In vi editor, forward search is performed using the command.

:pat
All of these
?pat
/pat

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Unix
Which command is used to list all the files with extension .lst?

ls *.*
ls *[lst]
ls -l *.lst
ls lst*

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Unix
Which commands is used to assign executable permission to all of the files named "letter"?

chmod ugo+x letter
chmod u+x letter
chmod ugo+rw letter
chmod ugo+r letter

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Unix
Which of the following commands is used to update access and modification times of a file?

cat
wc
touch
grep

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