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6 C The DISPLAY environment variable is used to configure where the X Windows desktop is displayed A, B, and D are incorrect A contains the name of the bash configuration file read when the shell was started B is a distracter There s no environment variable named XWIN D is incorrect for the same reason 7 D You must reference the PATH variable using $PATH after the = sign Otherwise, PATH will be interpreted as a literal string of text A, B, and C are incorrect A is incorrect because the $ has been omitted on the second instance of PATH in the command B is incorrect You export a variable after it has been created or modified C is incorrect The $ is only required on the second instance of PATH in the command
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8 A and E You can use the set or the env command to view your variables B, C, and D are incorrect B, C, and D are distracters that use invalid commands 9 A The alias command is used to view your system s aliases B, C, and D are incorrect Each of these responses is a distracter and invalid 10 B The alias mntflp= mount t vfat /dev/fd0 /media/floppy;mount |grep fd0;ls l /media/ floppy command will create the mntflp alias A, C, and D are incorrect A omits the alias command C is incorrect because it separates commands in the alias with commas instead of semi-colons D is incorrect because it omits the quotes around the command in the alias
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11 B and E The stdout and stderr file descriptors represent output displayed on screen (by default) by most commands A, C, and D are incorrect A refers to the standard input descriptor C and D are distracters 12 C The /tail/var/log/firewall 1>lastevents 2>&1 command will send both stdout and stderr to the same file A, B, and D are incorrect A will cause the stdout to be overwritten by the stderr B will only write the stdout to the file D is a distracter that uses incorrect syntax 13 A The sort </logfiletxt command will send the file to the stdin of the sort command B, C, and D are incorrect B is a distracter that uses incorrect syntax, as do C and D 14 D The cat /logfiletxt |sort command will send the output of cat (containing the contents of the file) to the stdin of the sort command A, B, and C are incorrect A is a distracter that uses incorrect syntax, as do B and C 15 A The cat /var/log/messages |awk /syslog/ {print $6,$7,$8} command will find instances of syslog in the stdout of cat and print the sixth, seventh, and eighth words in each matching line B, C, and D are incorrect B is incorrect because it omits the $ characters needed to reference the fields in each record C is incorrect because it omits the quotes need to enclose the awk options D is incorrect because it omits the $ characters and also fails to enclose the search term in slashes / /
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16 B The #!/bin/bash element must be included at the beginning of every bash shell script A, C, and D are incorrect A is expected, but not required C should also be included in every script, but it comes at the end of the file D is a distracter
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17 A and E You can enter /bin/bash ~/myscript or chmod u+x ~/myscript to make the script execute B, C, and D are incorrect B won t work because the script text file, by default, isn t executable unless you change its permissions C and D are distracters 18 B The declare i TOTAL command will create the TOTAL variable and type it as integer A, C, and D are incorrect Each of these responses is a distracter that uses incorrect syntax
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