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#include < unistd.h >
int execl(const char pathname, const char \*arg0, ... / NULL \*/);
int execv(const char \*pathname, char \*const argv\[\]);
int execle(const char pathname, const char \*arg0, ... / NULL, char \*const envp\[\] \*/);
int execve(const char \*pathname, char \*const argv\[\], char \*const envp\[\]);
int execlp(const char filename, const char \*arg0, ... / NULL \*/)
int execvp(const char \*filename, char \*const argv\[\]);

\#include < sys/types.h >
\#include < sys/wait.h >
\#include < unistd.h >
char \*env_init\[\] = { "USER=unknown", "PATH=/tmp", NULL };
int main(void)
{
pid_t pid;
if ( (pid = fork()) < 0)
perror("fork error");
else if (pid == 0)
< 0) perror("execle error"); " >{ /\* specify pathname, specify environment \*/ if (execle("/bin", "echo", "myarg1", "MY ARG2", (char \*) 0, env_init) < 0) perror("execle error"); }
if (waitpid(pid, NULL, 0) < 0)
perror("wait error");
if ( (pid = fork()) < 0)
perror("fork error");
else if (pid == 0)
< 0) perror("execlp error"); " >{ /\* specify filename, inherit environment \*/ if (execlp("echo", "echo", "only 1 arg", (char \*) 0) < 0) perror("execlp error"); }
exit(0);
}