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Unix

Unix
Which command is used to count just the number of characters in a file?

wc -c
wc - 1
wc -r
wc -w

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Unix
Which of the following is invalid filename?

None of these
trial
my .file
TRY

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Unix
Which command is used to display and create files?

vi
ed
lyrix
cat

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Unix
Which command is used to copy all files having the string chap and any two characters after that to the progs directory?

cp chap* progs
cp chap?? /progs/*
cp chap?? progs
cp chap[12] /progs/*.*

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Unix
Which of the following commands is used to have a two-way communication with any person who is currently logged in?

mail
mesg
grep
None of these
write

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Unix
Which command is used to change protection mode of files starting with the string emp and ending with 1,2, or 3?

chmod u+r ??? emp
chmod 222 emp?
chmod u+x emp[1-3]
chmod 777 emp*

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