Programming

Hi All,

I'm executing unix commands from my C script.
Using system("unix command").
Please see the below code:
main(int argc, char *argv[])
{
system("hostname > hostname.txt");
}
For removing the hard coding in the above code. I tried this.
main(int argc, char *argv[])
{
system(" hostname > argv[1]");
}
But the output is getting stored in the file "argv[1]".
I tried using $argv[1], But it didn't work.
Please let me know how can I achieve this.

Thanks & Regards,
Venkatesh.

Try

Code:

output=`/root/Desktop/get_password arg1 arg2`

Why do you need "set" ?

Why do you keep programs in a Desktop directory?

Hi porter,

I have just posted that code as an example. I'm not storing the programs on Desktop.
I tried giving output= '/root/Desktop/get_password' and it's working fine.
I gave a space after '='.
When I tried giving output= '/root/Desktop/get_password arg1 arg2' , it's throwing an error.
Error: No such file or directory.

regards,
venkatesh.

Porter was telling you about a syntax error in your script:

set output=.....

is wrong, use

output=....

instead. And, btw., don't use backticks, as they are an (outdated) abomination in the eyes of The Lord. ;-) The correct syntax would be:

output="$(/path/to/program arg1 arg2 arg3)"

bakunin

Hi,

Thanks a lot.
output="$(/path/to/program arg1 arg2 arg3)"
This worked.

regards,
venkatesh

Hi All,

I'm executing unix commands from my C script.
Using system("unix command").
Please see the below code:
main(int argc, char *argv[])
{
system("hostname > hostname.txt");
}
For removing the hard coding in the above code. I tried this.
main(int argc, char *argv[])
{
system(" hostname > argv[1]");
}
But the output is getting stored in the file "argv[1]".
I tried using $argv[1], But it didn't work.
Please let me know how can I achieve this.

Thanks & Regards,
Venkatesh.

C doesn't work like a shell script, you can't expect variables to simply expand.

1. Prepare a string
2. use sprintf() or a similar mechanism to write the command along with the argument passed to the program into that string
3. execute system() with this string.

bakunin