Which of the following sed commands will replace all instances of the string foo with the string foobar changing the file filel.txt in place?

• A.sed 's/foo/foobar/g' file1.txt | file1.txt
• B.sed 's/foo/foobar/g' file1.txt
• C.sed -i 's/foo/foobar/g' file1.txt
• D.sed -i 's/foo/foobar/g' file1.txt >file1.txt
• E.sed 's/foo/foobar/g' file1.txt > file1.txt

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Which of the following is the default XFree86 configuration file?

• A./usr/etc/X11/XF86Config
• B./var/X11/XF86Config
• C./usr/X11R6/etc/XF86Config
• D./etc/X11/XF86Config

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Which SysV init configuration file is commonly used to set the default run level? (Specify the full name of the file, including path.)

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Which of the following commands makes /bin/foo executable by everyone but only writable by its owner?

• A.chmod 557 /bin/foo
• B.chown 557 /bin/foo
• C.chmod o +rwx, a+rx /bin/foo
• D.chmod 755 /bin/foo

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What is true regarding the command
ls > files
if files do not exist?

• A.The output of ls is printed to the terminal
• B.files is created and contains the output of ls
• C.An error message is shown and ls is not executed
• D.The command files is executed and receives the output of ls
• E.Any output of ls is discarded

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