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function sumitup { echo $(($1 + $2)) ; }

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command sumitup { echo $(($1 + $2)) ; }

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function sumitup { echo $1 + $2 ; }

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method sumitup { echo $1 + $2 ; }

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command sumitup { echo $1 + $2 ; }

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The batch command will run multiple times. The at command will only run once. ✘ The commands of a batch job run sequentially one after another while the commands in at jobs may run in parallel. ✘ The at command reads commands from standard input. The batch command requires a command line argument. ✘ The at command e-mail results to the user. The batch command logs results to syslog. ✔

Add the specific user to the /etc/ at.allow file. ✘ Add the specific user to the [deny] section in the /etc/std.conf file. ✘ Add the specific user to the /etc/at.deny file. ✘ Add the specific user to the nojobs group. ✔ Run atd ??deny followed by the name of the specific user. ✔

/etc/bashrc ✘ /etc/profile ✘

~/.bash_profile

✘ /etc/.bashrc ✔

SELECT (name, address) FROM contacts; ✘ SELECT (name address) FROM contacts; ✘ SELECT name, address FROM contacts; ✘ SELECT name address FROM contacts; ✔

/etc/X11/xdm/Xsetup ✘ /etc/X11/xdm.conf ✘ /etc/X11/xdm/Defaults ✘ /etc/X11/defaults.conf ✔

It is placed in curly brackets as in Section SectionName { ... }.

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It is placed between a line containing Section "SectionName" and a line containing EndSection.

✘ It is placed between the tags

and

✘ It is placed after the row [SectionName]. ✔

It is placed after an initial unindented Section "SectionName" and must be indented by exactly one tab character.

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It reads text displayed on the screen to blind or visually impaired people. ✘ It reads the parameters of the attached monitors and creates an appropriate X11 configuration. ✘ It displays lines and markers to help people use speed reading techniques. ✘ It manages and displays files that contain e-books. ✔

It is started by a user using the command startx. ✘ It is started like any other system service by the init system. ✘ It is started by inetd when a remote hosts connects to the X11 port. ✘ It is started automatically when a X11 user logs in to the system console. ✔

xkb ✘ atkb ✘ GOK ✘ xOSK ✔