Re: C Program to execute programs in same console
Hi Jon, could you give another example ( not cd ) of a command which you would like to execute in the calling shell? regards, usleep On 4/5/06, Jonathan Herriott [EMAIL PROTECTED] wrote: usleep, What I am trying to do is execute the command in the calling shell. So, if I were to execute my program, which changes the directory, it would do the following: pwd /usr/home/username/ ./myprog .. pwd /usr/home/ That's basically what I'm looking for. Being able to modify the calling shell with a program. Thanks, Jon On 4/4/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Jon, i believe you are mixing up some concepts. 1. if i read your title C Program to execute programs in same console. i think this is easy, just use system(ls *.txt) and you are done. i believe you can choose wat to do with the output, i am not sure. 2. but you come up with the cd-command, which you want to change the context of your parent shell. changing the home-dir of the current process ( your program ) can be done with chdir. altering the context of your parent-shell-process can not be done, except for setting environment variables ( through the proper C calls ) but if you are running your program, your shell (interpreter) is temporarily not there: your program is running the show. every system,execvp or whatever call will give you a child-process with a new shell, not the parent-shell-process. i believe you may set environment variables in your parent shell with the appropiate library calls, but not through a system/execvp call. so, maybe you should define what you really want to achieve. for example, qdvd-author runs alls kinds of external programs to generate thumbnails and slideshows for example. anybody please correct me if i am wrong. regards, usleep On 4/4/06, Jonathan Herriott [EMAIL PROTECTED] wrote: Thanks for the suggestion. I haven't tried it yet, but I'll post if I get it working. Thanks, Jon On 4/3/06, cpghost [EMAIL PROTECTED] wrote: On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. Hmmm... chdir(2) would not change the parent process' (the shell's process) current working directory, only the current working directory of the process running the C program. Perhaps connecting to the shell via a pty, and then sending it a 'cd' command could work? Of look at how expect(1) (/usr/ports/lang/expect) implements this kind of stuff... Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
usleep, What I am trying to do is execute the command in the calling shell. So, if I were to execute my program, which changes the directory, it would do the following: pwd /usr/home/username/ ./myprog .. pwd /usr/home/ That's basically what I'm looking for. Being able to modify the calling shell with a program. Thanks, Jon On 4/4/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Jon, i believe you are mixing up some concepts. 1. if i read your title C Program to execute programs in same console. i think this is easy, just use system(ls *.txt) and you are done. i believe you can choose wat to do with the output, i am not sure. 2. but you come up with the cd-command, which you want to change the context of your parent shell. changing the home-dir of the current process ( your program ) can be done with chdir. altering the context of your parent-shell-process can not be done, except for setting environment variables ( through the proper C calls ) but if you are running your program, your shell (interpreter) is temporarily not there: your program is running the show. every system,execvp or whatever call will give you a child-process with a new shell, not the parent-shell-process. i believe you may set environment variables in your parent shell with the appropiate library calls, but not through a system/execvp call. so, maybe you should define what you really want to achieve. for example, qdvd-author runs alls kinds of external programs to generate thumbnails and slideshows for example. anybody please correct me if i am wrong. regards, usleep On 4/4/06, Jonathan Herriott [EMAIL PROTECTED] wrote: Thanks for the suggestion. I haven't tried it yet, but I'll post if I get it working. Thanks, Jon On 4/3/06, cpghost [EMAIL PROTECTED] wrote: On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. Hmmm... chdir(2) would not change the parent process' (the shell's process) current working directory, only the current working directory of the process running the C program. Perhaps connecting to the shell via a pty, and then sending it a 'cd' command could work? Of look at how expect(1) (/usr/ports/lang/expect) implements this kind of stuff... Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
On Tue, Apr 04, 2006 at 09:33:04PM -0400, Jonathan Herriott wrote: usleep, What I am trying to do is execute the command in the calling shell. So, if I were to execute my program, which changes the directory, it would do the following: pwd /usr/home/username/ ./myprog .. pwd /usr/home/ That's basically what I'm looking for. Being able to modify the calling shell with a program. It is not possible to do that. A program can only change its own working directory, not that of other programs. -- Insert your favourite quote here. Erik Trulsson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
Jonathan Herriott wrote: What I am trying to do is execute the command in the calling shell. So, if I were to execute my program, which changes the directory, it would do the following: pwd /usr/home/username/ ./myprog .. pwd /usr/home/ That's basically what I'm looking for. Being able to modify the calling shell with a program. Write a shell script. If using sh/bash? run it as . shellscript or if csh source shellscript. You can then make aliases (at least in csh) like so: alias foo source shellscript Then when you type foo, any cd inside the shellscript will affect your current shell. e.g. % cat foo.sh cd .. % alias foo source foo.sh % pwd /tmp % foo % pwd / % This is a rubbish alias since it only works if you are in the same directory as the shellscript, but I'm sure you can do better :-) To my mind you are still explaining the solution you have come up with for some problem, but have not actually explained the original problem. Your solution is generally impossible since one process (your C program) cannot arbitrarily affect the running environment (the current directory) of another process (your shell). --Alex ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
Thanks for the suggestion. I haven't tried it yet, but I'll post if I get it working. Thanks, Jon On 4/3/06, cpghost [EMAIL PROTECTED] wrote: On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. Hmmm... chdir(2) would not change the parent process' (the shell's process) current working directory, only the current working directory of the process running the C program. Perhaps connecting to the shell via a pty, and then sending it a 'cd' command could work? Of look at how expect(1) (/usr/ports/lang/expect) implements this kind of stuff... Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
Jon, i believe you are mixing up some concepts. 1. if i read your title C Program to execute programs in same console. i think this is easy, just use system(ls *.txt) and you are done. i believe you can choose wat to do with the output, i am not sure. 2. but you come up with the cd-command, which you want to change the context of your parent shell. changing the home-dir of the current process ( your program ) can be done with chdir. altering the context of your parent-shell-process can not be done, except for setting environment variables ( through the proper C calls ) but if you are running your program, your shell (interpreter) is temporarily not there: your program is running the show. every system,execvp or whatever call will give you a child-process with a new shell, not the parent-shell-process. i believe you may set environment variables in your parent shell with the appropiate library calls, but not through a system/execvp call. so, maybe you should define what you really want to achieve. for example, qdvd-author runs alls kinds of external programs to generate thumbnails and slideshows for example. anybody please correct me if i am wrong. regards, usleep On 4/4/06, Jonathan Herriott [EMAIL PROTECTED] wrote: Thanks for the suggestion. I haven't tried it yet, but I'll post if I get it working. Thanks, Jon On 4/3/06, cpghost [EMAIL PROTECTED] wrote: On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. Hmmm... chdir(2) would not change the parent process' (the shell's process) current working directory, only the current working directory of the process running the C program. Perhaps connecting to the shell via a pty, and then sending it a 'cd' command could work? Of look at how expect(1) (/usr/ports/lang/expect) implements this kind of stuff... Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
C Program to execute programs in same console
Hi! I've come into an interesting problem I've been trying to figure out. For no other reason than my own interest, I've been trying to get a c program to execute other programs in the current console I am in (using kde if that helps). I tried using system() and execvp() calls to try and execute a cd command in my current shell, which of course, didn't work. It seems to open up a new shell, then execute the command, and then exit that new shell it had opened. So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Thanks in advance for the help! Jon ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: I've come into an interesting problem I've been trying to figure out. For no other reason than my own interest, I've been trying to get a c program to execute other programs in the current console I am in (using kde if that helps). I tried using system() and execvp() calls to try and execute a cd command in my current shell, which of course, didn't work. It seems to open up a new shell, then execute the command, and then exit that new shell it had opened. So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. -- Bill Moran Collaborative Fusion Inc. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: C Program to execute programs in same console
On Mon, Apr 03, 2006 at 05:45:19PM -0400, Bill Moran wrote: On Mon, 3 Apr 2006 21:39:11 + Jonathan Herriott [EMAIL PROTECTED] wrote: So, my question is how can I get it to execute a cd in the current shell using c code. You don't have to give me the code, just give me a term to search for or a function to look up. I'm sure someone knows how to do it here! Unless I'm misunderstanding your question, man 2 chdir should help out. Hmmm... chdir(2) would not change the parent process' (the shell's process) current working directory, only the current working directory of the process running the C program. Perhaps connecting to the shell via a pty, and then sending it a 'cd' command could work? Of look at how expect(1) (/usr/ports/lang/expect) implements this kind of stuff... Regards, -cpghost. -- Cordula's Web. http://www.cordula.ws/ ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
