execl
extern int execl(const char *path, const char *arg, ...);
int result = execl("ssh", "-C", "-L", localRedirect,
execl(kDefaultShell, kDefaultShell,
execl(shellp, shellname, "-c", &saveline[1], (char *)0);
execl(shellp, shellname, (char *)0);
#define _IO_execl execl
execl(argv[0], argv[0], "0", iterstr, timeptr, countptr, NULL);