|
|
Sponsored Content
Top Forums
UNIX for Dummies Questions & Answers
Shell Implementation
Post 7833 by clickonline1 on Tuesday 2nd of October 2001 02:53:12 PM
10-02-2001
Shell Implementation
I want to implement my own simple multi tasking shell in Unix which will take care of redirection (<, >, >>) and piping.
I am just unable to get a concrete idea of how exactly I have to start. I have several books...some are..
1. Maurice Bach- Design Of Unix Operating System
2. Richard Stevens- Advanced Programming in Unix
However I find the language too high and complicated in these books.
Can someone please suggest how exactly I should go abt it...(step by step)
What are the things that I need to Learn to Implement this?
(anything and everything)
I am just unable to get a concrete idea of how exactly I have to start. I have several books...some are..
1. Maurice Bach- Design Of Unix Operating System
2. Richard Stevens- Advanced Programming in Unix
However I find the language too high and complicated in these books.
Can someone please suggest how exactly I should go abt it...(step by step)
What are the things that I need to Learn to Implement this?
(anything and everything)
|
|
10 More Discussions You Might Find Interesting
1. Programming
//save in/out
int tmpin = dup(0);
int tmpout = dup(1);
//set initial input
int fdin;
if(_inputFile)
{
fdin = open(_inputFile, O_RDONLY | O_CREAT, S_IREAD | S_IWRITE);
}
else
{
//use default input
fdin = dup(tmpin);
}
int ret;
int fdout;
for(int i = 0; i... (14 Replies)
Discussion started by: AirBronto
14 Replies
2. UNIX for Advanced & Expert Users
It is possible for me to obtain the Inode of the path name using
ls -i <pathname> command
Can anyone tell me how its implemented... (3 Replies)
Discussion started by: ganapathy.psgit
3 Replies
3. Shell Programming and Scripting
Hi,
I am accepting a string from user. compare this output with the awk output as below...
echo "\n\n\tDay : \c"
read day
awk '{ if($day == $2) { if ($mon == $1) { print "Yes" }}}' syslog.txt
I am getting the follwoing error
awk: Field $() is not correct.
The input line... (5 Replies)
Discussion started by: EmbedUX
5 Replies
4. Programming
Hey Guys
I am trying to implement the malloc function for my OS class and I am having a little trouble with it. I would be really grateful if I could get some hints on this problem.
So I am using a doubly-linked list as my data structure and I have to allocate memory for it (duh...). The... (1 Reply)
Discussion started by: Gambit_b
1 Replies
5. UNIX for Advanced & Expert Users
Hey Guys
Some of my friends have got together and we are trying to write a basic kernel similar to Linux. I am trying to implement the malloc function in C and I am using a doubly linked list as the primary data structure. I need to allocate memory for this link list (duh...) and I don't feel... (2 Replies)
Discussion started by: rbansal2
2 Replies
6. Linux
Hi
I'm trying to implement CAPWAP protocol for my application.i'm able to configure my server side but i'm getting error at client(WTP) side as IOCTL error.while running the command
#./WTP /mnt/cf/capwap/
: wlan2
Starting WTP...
# WTP Loads... (0 Replies)
Discussion started by: ran789
0 Replies
7. UNIX for Dummies Questions & Answers
Hi everybody,
i've been googling for ages now and gotten kinda desperate... The question, however, might be rather trivial for the experts: What is it exactly, i.e. physically, the POSIX function (for a file) "lseek" does? Does it trigger some kind of synchronization on disk? Is it just for the... (4 Replies)
Discussion started by: Humudituu
4 Replies
8. Linux
Hi,
I am trying to execute a program with pipes to run a few basic commands by forking children. When I try to run commands in the child process without pipe, I am unable to run the command as execv fails. However for commands that are given with pipes execute successfully.
for example:... (1 Reply)
Discussion started by: mmurali2
1 Replies
9. UNIX for Advanced & Expert Users
How can i implement Ipsec between two machines in linux_ ubuntu?
any link?? suggestion?? (0 Replies)
Discussion started by: elinaz
0 Replies
10. Programming
I have this code from a programming book:
#include <stdio.h>
#include <string.h>
char buf; /* input line buffer */
char* field; /* fields */
char* unquote( char* );
/* csvgetline: read and parse line, return field count */
/* sample input:... (3 Replies)
Discussion started by: totoro125
3 Replies