问题:单选题The command echo $! will produce what output?()A the process id of last background commandB the exit status of the last commandC the exit status of the last background commandD the process id of the current shellE the name of the command being exe...
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问题:单选题What is the output when the following shell script executes?() cat;;foobar Hello foobar foobarA The contents of the file foobar.B HelloC No output but a file named foobar is created.D Hello foobarE Hello foobar foobar...
问题:填空题What command with all options and/or parameter will send the signal USR1 to any executing process of program apache2?()...
问题:多选题What does the Filesystem Hierarchy Standard enable? ()Asoftware to predict the location of installed files and directoriesBsoftware to predict the ownership and access rights to files and directoriesCusers to predict the location of installed files and...
问题:单选题With Xorg 7.0, what is the name of the default font server?()A xfservB xfsC fontsD xfsttE fserv...
问题:单选题Many people like the vi text editor but the default bash command line editor recognizes emacs keystrokes. What command entered into a bash initialization file will have bash recognize vi keystrokes after login?()A history-pviB alias emacs=viC HISTCM...
问题:单选题Using vi, you want to save changes to the file myfile with :w!, but vi complains it cannot write to the file. Therefore, you want to check the write permissions on the file. To do this without leaving vi, you type:()A :!ls-I myfileB :/ls-l myfileC e...
问题:填空题USB fax/modems that conform to this subclass of the Communication Device Class (CDC) vendor neutral standard are Linux compatible (answer is a 3 letter acronym).()...
问题:单选题Given the following output: prompt myapp [1]+ Stopped myapp prompt Which of the following commands will resume executing the stopped process while allowing the user to continue to type commands at the command prompt?()A bg myappB continue myapp...
问题:填空题Which program finds only files that are in your PATH?()...
问题:单选题In xorg.conf, which section is concerned with fonts?()A the Fonts sectionB the Files sectionC the xfsCodes sectionD the Graphics sectionE the modeline section...
问题:单选题What command will print a list of usernames (first column) and their corresponding user id (uid, third column) from /etc/passwd?()A cut -d: -f 1,3 /etc/passwdB chop -c 1,3 /etc/passwdC tac 1-3/etc/passwdD fmt -u /etc/passwd...
问题:单选题You have just added a CD.ROM drive (/dev/hdd) to your system and have added it to yourfstab. Typically you can use which of the following commands to mount media in that drive to /mnt/cdrom?()A mount /dev/cdrom /mnt/cdromB mount/dev/cdromC mount -t ...
问题:填空题What application can be used in place of xhost? Please enter only the name without path. Answer:()...
问题:填空题Which command (without options) would you use to display how much space is available on all mounted partitions?()...
问题:单选题You wish to kill a process with a PID of 123. Select the command which exiting.()A kill-1 123B kill-9 123C kill-15 123D kill-17 123...