Linux First Exam Questions

1.1 I want to create a oldboy.txt file under the/data/oldboyedu directory

[Email protected] ~]# cd/data/oldboyedu

-BASH:CD:/data/oldboyedu:no such file ordirectory

1. Why this error has occurred

2. How do I resolve this error?

No /data/oldboyedu this directory

Mkdir-p/data/oldboyedu

Touch/data/oldboyedu/oldboy.txt

1.2 The question , add the content "I Love studying Linux" to oldboy.txt. (not less than 2 methods )

Method One

Vim/data/oldboyedu/oldboy.txt

I Love studying Linux.

Method Two

echo "I love Studyinglinux." >>/data/oldboyedu/oldboy.txt

Method Three

Cat >>/data/oldboyedu/oldboy.txt<<eof

I Love studying Linux.

Eof

1.3 Copy the/data directory to the/tmp directory

cp-r/data//tmp/

1.4 said these special symbolic meanings : > >> 2> 2>> # ( pound ). ( point ): ( two points )

> output REDIRECT symbol >> append output redirect 2> standard error Output redirect

2>> standard error Append output redirect # comment . current directory

.. Top level directory of current directory

1.5 test.txt content is :

Trainning

Fanbing

Binglidao

please give the command that does not contain the trainning string when outputting the contents of the Test.txt file .

method One: Tail-2 ett.txt

method Two:grep-v "Trainning" Ett.txt

method Three:sed '/trainning/d ' ett.txt

method Four:sed-n ' 2,3p ' ett.txt

method Five:awk '!/trainning/' ett.txt

method Six:awk ' nr==2,nr==3 ' ett.txt

1.6 New company, boss let you restrict the RM command on the server , when the user enters the RM command Prompt "rm commandis not allowed to use. " What are the steps to be implemented?

Alias rm= ' echo RM commandis notallowed to use '

Source/ect/profile

Modify Comment VIM/ROOT/.BASHRC

1.7 Take out the contents of the file ett.txt from the first of the lines.

method One: sed-n ' 30,40p ' ett.txt

method Two:awk ' nr==30,nr==40 ' ett.txt

1.8 Change the trainning in the Test.txt file to Oldboy.

sed ' s#trainning#oldboy#g ' test.txt

1.9 finds all files in the/data directory ending in. txt, and modifies the trainning in the file to Oldboy.

find/data-type f-name "*.txt" |xargs sed ' s#trainning#oldboy#g '

1.10 Find All files under /oldboy that are larger than 1M at the end of the log are copied to /tmp .

Find/oldboy-type f-name "*.log"-size +1m |xargs cp-t/tmp

CP $ (Find/oldboy-type f-name "*.log"-size +1m)/oldboy

1.11 What is the operating level of Linux, describe the meaning of different numbers of Linux running levels? (Additional questions)

0 turn off the machine

1 Single-user mode

2 Multi-user mode (no NFS)

3 full Multi-user mode

4 not used

5 Graphical Interface

6 Restart

1.12 Please describe the difference between buffer and cache ( additional questions )?

Buffer: The memory space in which data is written to memory is called buffer buffers

Cache: The memory space to read data to memory is called the cache cache

This article is from the "Heyong" blog, make sure to keep this source http://heyong.blog.51cto.com/13121269/1954288

Linux First Exam Questions