help with C, system()


 
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# 1  
Old 03-12-2011
Error help with C, system()

i am trying to do the system command using exec1
i have
execl("/bin/sh", "-c", "ls", (char *) 0);
this line but it fails and says
-c: Can't open ls

the man system says that

system() executes a command specified in command by calling /bin/sh -c
command, and returns after the command has been completed. During exeâ
cution of the command, SIGCHLD will be blocked, and SIGINT and SIGQUIT
will be ignored.

so why isnt this working?
# 2  
Old 03-12-2011
Even if you succeeded you'd find yourself surprised that your program died immediately thereafter because execl() is only half what system() does. execl() actually replaces the current program, it doesn't launch a new one.

The first argument of execl is the file to execute. The rest afterwards are the parameters -- and the program name is a parameter too so you actually need
Code:
execl("/bin/sh", "/bin/sh", "-c", "ls", NULL);

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