超星 - 基本命令作业

单选题

The following is the output of ls -al, which one is a directory file:

A. -rw------- 1 hel users 56 Sep 09 11:05 hello
B. -rw------- 2 hel users 56 Sep 09 11:05 goodbye
C. drwx----- 1 hel users 1024 Sep 10 08:10 zhang
D. lrwx----- 1 hel users 2024 Sep 12 08:12 cheng->goodbye

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单选题

The following is the output of ls -al, which one is a hard link file:

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单选题

The following is the output of command ‘ps –t tty1', which one is the zombie process.UID PID PPID C STIME TTY TIME CMDA root 2258 2199 0 10:09 tty1 00:00:00 -bashB root 2339 2258 0 10:13 tty1 00:00:00 ./zombC root 2340 2339 0 10:13 tty1 00:00:00 [zomb]

A root 2258 2199 0 10:09 tty1 00:00:00 -bash
B root 2339 2258 0 10:13 tty1 00:00:00 ./zomb
C root 2340 2339 0 10:13 tty1 00:00:00 [zomb] <defunct>
D. B and C

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单选题

The following is the output of the command 'ps -t tty1', which one is the parent process of the zombie process.UID PID PPID C STIME TTY TIME CMDA root 2258 2199 0 10:09 tty1 00:00:00 -bashB root 2339 2258 0 10:13 tty1 00:00:00 ./zombC root 2340 2339 0 10:13 tty1 00:00:00 [zomb]

A root 2258 2199 0 10:09 tty1 00:00:00 -bash
B root 2339 2258 0 10:13 tty1 00:00:00 ./zomb
C root 2340 2339 0 10:13 tty1 00:00:00 [zomb] <defunct>
D. none of the above

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单选题

The correct combined commands for finding function "func" in all the .c file under the directory "/usr/src" is

A. find /usr/src –name *.c –print|xargs grep “func(”
B. find /usr/src –path *.c –print|xargs grep “func(”
C. find /usr/src –name *.c –print|grep “func(”
D. find /usr/src –path *.c –print|grep “func(”

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单选题

The directory structure of the Linux file system is an upside-down tree, with files placed in related directories. If there is an external device file, in which directory one should place.

A. /bin
B. /etc
C. /dev
D. /lib

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单选题

The combined command "ls - l | grep -v '^d'" means:

A. Display all directory files in a long list in the current directory.
B. Display all files in a long list in the current directory except directory files.
C. Display all files in a long list in the current directory
Display all device files in a long list in the current directory.

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单选题