[问题求助]在国外学习linux，作业求助 [复制链接]

Write your answers into a single text file. Su.bmit the text fil.e. 域名


(16 marks)
Hints. Use a single. comma.nd line where possible. Check your answers. 健康



Write UNIX .commands to 服务器


a) show. the. current value of the environment variable PATH.     健康


b) show the count of how many characters the date c.o.mmand outputs.              电子


c) copy all C source fi.les (the filenames have the .extension .c) fr.om the present working direc.tory into a subdirectory called Cfiles. --------------彩票


d) list all files in .the present working directory that .hav.e filenames that match: 外贸
starts .with ei.ther a or B 电影


AND the extensio.n .is a single digit .


e.) comp.ress all the files in the directory Docs/ and store them .in an archive called Docs.tar .


f) sort the file /etc/passwd in reverse alphabetical order by usern.ame. I.ts the firs.t field.            女人


g) Change to. th.e tsch shell.              电子

h) Append the date and current proces.ses list to a file calle.d Log. .


(4 marks)
m1, m2 and m3 are text files. .What do the fol.low commands do unde.r bash? Explain your answer. .


a.) cat m2 & m1 投资


b) cat 0 m1  sort 1 m2 .2. m3     健康


(4 marks)
A d.irectory structure look.s like: 投资


             .            .           /学习
                               .  /  .   \    外汇
                              .  /   .    \.
   .               .           subdir1  subdir2.
                          .    /   \  .     \.
.                            /     .\       \    健康
                 .      .   file1  file2   subdir3.
              
  That is:
     subdir1 a..nd subdir2 are subdirectories of the root directory /;.
     s.ubdir1 contains file1 and file2;..
     and subdir2. contains su.bdirectory subdir3外贸


a) What is the absolute pathname fo.r su.bdir3            鲜花
(

b) If the pr.esent working directory is /subdir1 give a command to move all the files in subdir1 into subdir3. using .r.elative pathnames.           婚庆



(6 marks)
Br.ief answers please.               乙肝


a) Wha.t are the 4 freedoms associated with Free Software.? see www.gnu.org/ph.ilosophy/free-sw.html <性病>



b) Why GNU claim free soft.ware is. more reliable than proprietary software? --------------彩票

c) Name a .URL th.at has online tutorial on Linux.虚拟主机

作业要自己做。。。

既然是作业，为什么不自己做呢？
老师不可能要你们做一些毫无头绪的东西吧。

在国外更要学会自力更生阿……

Hints. Use a single command line where possible. Check your answers.



Write UNIX commands to


a) show the current value of the environment variable PATH.
( $echo $PATH )

b) show the count of how many characters the date command outputs.
( $date | wc -c )

c) copy all C source files (the filenames have the extension .c) from the present working directory into a subdirectory called Cfiles.
( $cp *.c Cfiles )

d) list all files in the present working directory that have filenames that match:
starts with either a or B
( $ls {a,B}?  )

AND the extension is a single digit


e) compress all the files in the directory Docs/ and store them in an archive called Docs.tar
( $tar -zcvf Docs.tar Docs/  )

f) sort the file /etc/passwd in reverse alphabetical order by username. Its the first field.
( $sort -r /etc/passwd )

g) Change to the tsch shell.
   (  $tcsh  )
h) Append the date and current processes list to a file called Log.
( ps >> Log )

(4 marks)
m1, m2 and m3 are text files. What do the follow commands do under bash? Explain your answer.


? a) cat m2 >& m1
? b) cat 0< m1 | sort 1> m2 2> m3

(4 marks)
A directory structure looks like:


                                    /
                                 /     \
                                /       \
                             subdir1  subdir2
                              /   \       \
                             /     \       \
                          file1  file2   subdir3
              
  That is:
     subdir1 and subdir2 are subdirectories of the root directory /;
     subdir1 contains file1 and file2;
     and subdir2 contains subdirectory subdir3


a) What is the absolute pathname for subdir3
( /root/subdir2/subdir3 )

b) If the present working directory is /subdir1 give a command to move all the files in subdir1 into subdir3 using relative pathnames.
( cp -r * ../subdir2/subdir3  )

很想帮你看啊，不过不太看得懂
对于检察，你把答案敲出来看是否满足题目要求不就是了~

这个作业很不错，特别是最后几题！
——再次反思国人教育