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What file allow admin to adjust number of mounts after which file system will be checked by e2fsck?

You are trying to make a hard link to an ordinary file but ln returns an error. Which of the following could cause this?

After modifying GRUB’s configuration file, what command should you run for the changes to take
effect?

Which TWO runlevels should never be declared as the default runlevel?

The file myfile.txt contains the following data:
joe:x:100:100:Joe:/home/joe:/bin/bash
mike:x:101:101:Mike:/home/mike:/bin/sh

kevin:x:102:102:Kevin:/home/kevin:/bin/sh
matt:x:103:103:Matt:/home/matt:/bin/sh
What output will be displayed on the screen when the following command is executed:
grep -o home myfile.txt

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In which directory must definition files be placed to add additional repositories to yum?

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You’ve downloaded an image file of a boot floppy disk to your hard drive. What is the best utility to create a boot floppy from the disk image? (Specify a single
command without options.)

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Which command is used to enable disk quotas on a particular filesystem? (Provide only the command, with no options or parameters)

After modifying LILO’s configuration file, what command should you run for the changes to take effect?

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What command will print the shared libraries for the file /usr/lib/libpng12.so? (Provide the full command with library name but without any other options or
parameters)