首页
编程语言
数据库
网络开发
Algorithm算法
移动开发
系统相关
金融统计
人工智能
其他
首页
>
> 详细
013230998X辅导、Systems留学生讲解、辅导C/C++语言、讲解c/c++程序设计 辅导Python程序|辅导R语言程序
PROGRAMMING PROJECT ONE
DEVELOPING A SHELL
William Stallings
Copyright 2011
Supplement to
Operating Systems, Seventh Edition
Prentice Hall 2011
The Shell or Command Line Interpreter is the fundamental User interface to
an Operating System. Your first project is to write a simple shell - myshell -
that has the following properties:
1. The shell must support the following internal commands:
i. cd
- Change the current default directory to
. If the
argument is not present, report
the current directory. If the directory does not exist an appropriate
error should be reported. This command should also change the PWD
environment variable.
ii. clr - Clear the screen.
iii. dir
- List the contents of directory
.
iv. environ - List all the environment strings.
v. echo
- Display
on the display followed by a
new line (multiple spaces/tabs may be reduced to a single space).
vi. help - Display the user manual using the more filter.
vii. pause - Pause operation of the shell until 'Enter' is pressed.
viii. quit - Quit the shell.
ix. The shell environment should contain shell=
/myshell
where
/myshell is the full path for the shell executable
(not a hardwired path back to your directory, but the one from which
it was executed).
2. All other command line input is interpreted as program invocation,
which should be done by the shell forking and execing the programs as
its own child processes. The programs should be executed with an
environment that contains the entry: parent=
/myshell
where
/myshell is as described in 1.ix. above.
–3–
3. The shell must be able to take its command line input from a file. That
is, if the shell is invoked with a command line argument:
myshell batchfile
then batchfile is assumed to contain a set of command lines for the
shell to process. When the end-of-file is reached, the shell should exit.
Obviously, if the shell is invoked without a command line argument, it
solicits input from the user via a prompt on the display.
4. The shell must support i/o-redirection on either or both stdin and/or
stdout. That is, the command line
programname arg1 arg2 < inputfile > outputfile
will execute the program programname with arguments arg1 and arg2,
the stdin FILE stream replaced by inputfile and the stdout FILE
stream replaced by outputfile.
stdout redirection should also be possible for the internal commands
dir, environ, echo, & help.
With output redirection, if the redirection character is > then the
outputfile is created if it does not exist and truncated if it does. If the
redirection token is >> then outputfile is created if it does not exist
and appended to if it does.
5. The shell must support background execution of programs. An
ampersand (&) at the end of the command line indicates that the shell
–4–
should return to the command line prompt immediately after launching
that program.
6. The command line prompt must contain the pathname of the current
directory.
Note: You can assume that all command line arguments (including the
redirection symbols, <, > & >> and the background execution symbol, &) will
be delimited from other command line arguments by white space - one or
more spaces and/or tabs (see the command line in 4. above).
Project Requirements
1. Design a simple command line shell that satisfies the above criteria and
implement it on the specified UNIX platform.
2. Write a simple manual describing how to use the shell. The manual
should contain enough detail for a beginner to UNIX to use it. For
example, you should explain the concepts of I/O redirection, the
program environment, and background program execution. The manual
MUST be named readme and must be a simple text document capable of
being read by a standard Text Editor.
For an example of the sort of depth and type of description required,
you should have a look at the online manuals for csh and tcsh (man
csh, man tcsh). These shells obviously have much more functionality
than yours and thus, your manuals don’t have to be quite so large.
You should NOT include building instructions, included file lists or source
code - we can find that out from the other files you submit. This should
–5–
be an Operator’s manual not a Developer’s manual.
3. The source code MUST be extensively commented and appropriately
structured to allow your peers to understand and easily maintain the
code. Properly commented and laid out code is much easier to interpret,
and it is in your interests to ensure that the person marking your
project is able to understand your coding without having to perform
mental gymnastics!
4. Details of submission procedures will be supplied well before the
deadline.
5. The submission should contain only source code file(s), include file(s), a
makefile (all lower case please), and the readme file (all lowercase,
please). No executable program should be included. The person marking
your project will be automatically rebuilding your shell program from the
source code provided. If the submitted code does not compile it cannot
be marked!
6. The makefile (all lowercase, please) MUST generate the binary file
myshell (all lower case please). A sample makefile would be
# Joe Citizen, s1234567 - Operating Systems Project 1
# CompLab1/01 tutor: Fred Bloggs
myshell: myshell.c utility.c myshell.h
gcc -Wall myshell.c utility.c -o myshell
The program myshell is then generated by just typing make at the
command line prompt.
–6–
Note: The fourth line in the above makefile MUST begin with a tab.
7. In the instance shown above, the files in the submitted directory would
be:
makefile
myshell.c
utility.c
myshell.h
readme
Submission
A makefile is required. All files in your submission will be copied to the
same directory, therefore, do not include any paths in your makefile. The
makefile should include all dependencies that build your program. If a
library is included, your makefile should also build the library.
Do not hand in any binary or object code files. All that is required is
your source code, a makefile and readme file. Test your project by copying
the source code only into an empty directory and then compile it by entering
the command make.
We shall be using a shell script that copies your files to a test directory,
deletes any pre-existing myshell, *.a, and/or *.o files, performs a make,
copies a set of test files to the test directory, and then exercises your shell
with a standard set of test scripts through stdin and command line
arguments. If this sequence fails due to wrong names, wrong case for
names, wrong version of source code that fails to compile, nonexistence of
files, etc. then the marking sequence will also stop. In this instance, the only
–7–
marks that can be awarded will be for the tests completed at that point and
the source code and manual.
Required Documentation
Your source code will be assessed and marked as well as the readme
manual. Commenting is definitely required in your source code. The user
manual can be presented in a format of your choice (within the limitations of
being displayable by a simple Text Editor). Again, the manual should contain
enough detail for a beginner to UNIX to use the shell. For example, you
should explain the concepts of I/O redirection, the program environment and
background execution. The manual MUST be named readme (all lowercase,
please, NO .txt extension).
联系我们
QQ:99515681
邮箱:99515681@qq.com
工作时间:8:00-21:00
微信:codinghelp
热点文章
更多
辅导 cs1b spring 2024 tth hw...
2024-04-19
讲解 managing financial risk...
2024-04-19
辅导 cs 0449 – project 5: /...
2024-04-19
辅导 elec 2141 digital circu...
2024-04-19
讲解 csc171 — videogame pro...
2024-04-19
讲解 comp3411 artificial int...
2024-04-19
讲解 stat3061: random proces...
2024-04-19
辅导 accounting 452, spring ...
2024-04-19
辅导 finc5001 foundations in...
2024-04-19
辅导 7ssmm712 – topics in a...
2024-04-19
讲解 com 337 - film studies ...
2024-04-19
辅导 mes202tc - digital vlsi...
2024-04-19
辅导 geography 2041b distanc...
2024-04-19
辅导 ecos3006 international ...
2024-04-19
讲解 fit5225 2024 sm1 creati...
2024-04-19
讲解 cit 593: introduction t...
2024-04-19
讲解 math 4931: take home ex...
2024-04-19
辅导 csci 547|info 533: syst...
2024-04-19
辅导 cs536-s24 intro to pls ...
2024-04-19
讲解 fit5212 - assignment 1辅...
2024-04-19
热点标签
ee5311
imse2113
comp 2322
acct2102
fnd109
int102
is3s664
is6153
data4000
accfin5034
fit5212
cs536-s24
fit5225
ecos3006
mes202tc
finc5001
stat3061
csc171
cs1b
7ssmm712
cpt206
swen90004
cs170
comp3411
bu.450.760
comp5313/comp4313—large
bl5611
kxo206
comp532
elec207
kxo151
hpm 573
dts101tc
cs 2820
cpt108
math2319
dts204tc
qm222
comp2511
ccs599
infs1001
mat2355
eeee4123
25721
ifn647
pols0010
cs 2550
cse340
comp2003j
comp9417
qbus6860
stat0023
csci 1100
cs 61b
cs360
fin 3080
ierg 4080
cs6238
cit 594
finm7406
hw6
elec9713
asb-2522
lit301
mcd4540
geog0030
125.330
biol0006
125.320
cs3334
fit2093
acct1101
110.309
masy1-gc
cs314
elec0048
gds104
mg5637
math5905
fit2096
07
mso3610
eel4837
sehs4515
cpt s 321
asb2522 investment
ma214
co2104
mgmt2015
32516
math32051
econ1012
mark2052
dsci 525
comp3310
econ0019
comp30023
abmf3184
aps106
antc27
finm7401
itp122
tech2300
math3026
cs 211
36318
cao107
fit1047
is2022
comp9024
ics4u
2xc3
en.540.635
4qqmn506
finn3081
phys10362
sta601
ec481e
math5165
csi 2120
el1205
comp7250
ecos3013
beam065
info1113
sehh2042
comp2051
csc325
mne 6130
ai6126
inu1111
ecs150
is61x6
cse115
seng6110
bus265
cpts260
mphy0009
csc306
eco2011
ee3004
st332
idepg001
info6001
cpt106
qbus2820
fins5516
finm7409
fit3152
isom3028
eece 6083
ceg5304
mcd4700
eecs 493
eg25h4
38173
elc5216
infs6071
lubs5996m
7ssmm803
glbh0031
phys1120
comp52715
eeb240
soci3403
math3836
cmns3490
iy5610/4610
cpt304
ac6105
psyc3241
fin570
218.323
lng310
rim3352
bio206
comp3334
ac.f633
asb-3525
cs 1501
cpt408
bust10134
lng206
acfi302
soc100
infr11199
csc1002
comp9334
csci 2122
etf5650
eco202y1y
acct608
apm236
gbsh0007
efim20005
actl5105
elec 292
sdsc4026
ds2500
dts205tc
联系我们
- QQ: 99515681 微信:codinghelp
© 2024
www.7daixie.com
站长地图
程序辅导网!