Shell Programming and Scripting

Hi everyone,

I need little help in shell operations from C++ program.
Here I furnish the details of problem:
1. Lets say my current working path is myWorkingPath.
2. In my working path I have list of name directories and each name directory has two more sub directories say A/B.
(now path to B will be pathB = myWorkingPath/name/A/B)
3. I have a executable (say run) in myWorkingPath directory, that i wanted to execute from B directory.
4. From C++ program I can do shell operations like mkdir, rm etc using system("mkdir NewDir"), system("rm file") etc., (these shell operations will done form myWorkingPath)
but unable to do some shell operations from pathB. How can I communicate pathB for system() operations?

lets say I have saved this path in pathB="/home/linuxUser/myWorkingPath/name/A/B". here name is a variable.

Code:

for(i=0;i<nameList.size(); i++){
pathB="/home/linuxUser/myWorkingPath"/nameList.name(i)/"A/B";
system("cd pathB"); // to goto that B directory
system("../../../run"); // to run the executable
}

I know this program is wrong but, may give you clear idea what i wanted to do.

can any one help me?

Regards,
linuxUser_

Why do you need to cd? Just give the full path to the second executable you want to run.

cd is just to convey that my script file run is written to execute from pathB.
so to make corresponding changes in pathB, one should go to that path and run the executable.

let say i am in working Directory.
to goto pathB

Code:

cd name/A/B

now i am in pathB and wanted to execute run which is in working dir

Code:

../../../run

hope it will make clear.

Regards,
linuxUser_

You could also use (inside script):

Code:

cd "${0/${0##/*/}}"

Or for better readability:

Code:

cd "$(dirname $0)"

hth

EDIT2:
How do you "rm file", just the file or the full path?
If full path, why wont that work?
If not full path, what is what you actualy want to achieve?

problem is in my c++ program i have saved a path that will vary with time (path referred as pathB in above description). now if i do some shell operations through c++ like system("rm $pathB filename") it will not work because shell dont know pathB.
question is how can i communicate shell about pathB that vary with time?

Regards,
linuxUser_

Probably better to have it as an environmental variable then, or passed in as a parameter so you keep your code flexible and don't have to keep editing it. With change comes risk.



Robin