Linux first pre-class test questions

1. Create a directory /data

Answer:

Method One: Mkdir/data

Method two: CD/; mkdir data

2. Create a file under/data oldboy.txt

Answer:

Method one: cd/data/; Touch Oldboy.txt

Method Two: Touch/data/oldboy.txt

3. added "I am studying linux" content for oldboy.txt

Answer:

Method One: Echo "I amstudying Linux" >oldboy.txt

Method Two: VI oldboy.txt

I am studying Linux

Method Three:CAT >>oldboy.txt<<eof

Iam studying Linux

Eof

4. Copy the Oldboy.txt file to / tmp

Solution: CP oldboy.txt/tmp

5. Copy the Oldboy.txt file to / tmp ( without any hint )

Answer:

Method One:/BIN/CP oldboy.txt/tmp

Method Two: \cp oldboy.txt/tmp

6. Move the/data directory to the /root

Answer:

mv/data//root

7.enter The data directory under the/root directory to delete the oldboy.txt file

Answer:

Cd/root/data; RM oldboy.txt

8, after the seventh question, exit to the previous level directory, delete the data directory

Answer:

Cd.. ; Rm–r/data

9, the known file test.txt content is

Congzhongzhi

Lidao

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

Answer:

Method One: Head-1 test.txt

Method Two: Grep–v "Lidao" test.txt

Method Three: sed '/lidao/d ' test.txt

Method four: Sed-n '/congzhongzhi/p ' test.txt or sed-n ' 1p ' test.txt

Method Five: awk '!/lidao/' test.txt

please use a command to complete the creation of the directory/oldboy/test, that is, create /oldboy directory and /oldboy/test directory

Answer:

Mkdir–p/oldboy/test

One, the known/ tmp already exists test.txt file, how to execute the command to put /mnt/test.txt Copy to / tmp cover it down .

/tmp/test.txt , and let the system not prompt whether to overwrite ( Root permissions).

Answer:

Method One:\cp/mnt/test.txt/tmp

Method Two:/bin/cp/mnt/test.txt/tmp

View Only the contents of the ett.txt file (a total of two lines) within the first line

Answer:

Method One: head–30 ett.txt |tail-11

Method Two: Sed-n ' 20,30p ' ett.txt

Method Three: awk ' {if (nr>19&&nr<31) print $} ' Ett.txt

Method four: awk ' nr>19&&nr<31 ' ett.txt

Method Three: Grep–a10 ett.txt

grep–b1030 Ett.txt

GREP–C5 Ett.txt

13, the /oldboy all of the directories and their subdirectories with the extension . SH the end of the file contains ./hostlists.txt all of the strings are replaced by .. /idctest_iplist

Answer:

Method One: Find/oldboy–type f–name "*.sh" |xargs sed–i ' S#./hostlists.txt #. /idctest_iplist #g '

Method Two: Find/oldboy–type f–name "*.sh" exec sed–i ' S#./hostlists.txt #. /idctest_iplist#g ' {} \;

Method Three: Sed–i ' S#./hostlists.txt #. /idctest_iplist #g '

Method four: For statement (script common)

For i in ' Ll/oldboy |grep. Sh|awk ' {print $NF} '

Do

Sed–i ' s#./hostlists.txt #. /idctest_iplist #g '

Done

Method Five: Sed-i ' s#oldboy#oldgirl#g ' find/oldboy/-type f-name "*.sh" '

Sed-i ' S#oldboy#oldgirl#g ' $ (find/oldboy/-type f-name "*.sh")

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Linux first pre-class test questions