CompTIA认证考试LX0-101单项选择题每日一练(2019.04.24)

单项选择题
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 myfile
B. ：\ls-l myfile
C. esc ：Is -I myfile
D. ：？ls-l myfile
单项选择题
You wish to kill a process with a PID of 123. Select the command which exiting.（）
A. kill-1 123
B. kill-9 123
C. kill-15 123
D. kill-17 123
单项选择题
Which of the following commands makes /bin/foo executable by everyone but writable only by its owner？（）
A. chmod 557 /bin/foo
B. chmod o+rwx.a+rx/bin/foo
C. chown 557 /bin/foo
D. chmod 755/bin/foo
单项选择题
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-pvi
B. alias emacs=vi
C. HISTCMD=vi
D. set -o vi
E. unset emacs
单项选择题
In xorg.conf， which section is concerned with fonts？（）
A. the Fonts section
B. the Files section
C. the xfsCodes section
D. the Graphics section
E. the modeline section