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Old 07-13-2005, 02:45 AM   #1
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execute system command in c

Hi i need to execute the following command in c
rm /root/test.log

so i have used the following code

fprintf(logfile,"status %d \n",status);

but still this code returns -1 which means failure.. Where am i wrong? Thx
Old 07-13-2005, 02:58 AM   #2
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Hi alaios,

Try adding this after the call to execl(), it will tell you what the error was:

perror("execl() failed");
Old 07-13-2005, 06:02 AM   #3
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thx but this wont help... this code is being executed by a child so i cant see the error message
Old 07-13-2005, 06:26 AM   #4
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1. I think you can use unlink to delete a file. Will it serve your purpose.

Extract from man execl.
The const char *arg and subsequent ellipses in the execl, execlp, and execle functions can be thought of as
arg0, arg1, ..., argn. Together they describe a list of one or more pointers to null-terminated strings that
represent the argument list available to the executed program.
The first argument, by convention, should point to the file name associated with the file being executed.
The list of arguments must be terminated by a NULL pointer.
2. The usual syntax i use for execl is

execl ("/bin/rm", "/bin/rm",  "/root/test/log", NULL);
Though i am not sure, if what you do is incorrect.



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