What is the difference between the functions of the exec family of system calls like exec and execve?

Question

I have been following a system programming course recently and I came through the system calls exec() and execve(). So far I cannot find a

Answer 1

Since all of these function belongs to exec() family, let me differentiate according to extra characters with the meanings,

1.execve():

p : not present => name of the program to run will be taken from pathname

v : present => argument will be passed as array

e : present => environment will be taken from envp argument

2.execle():

p : not present => name of the program to run will be taken from pathname

l : present => argument will be passed as list

e : present => environment will be taken from envp argument

3.execlp():

p : present => name of the program to run will be taken from filename specified or system will search for program file in PATH variable.

l : present => argument will be passed as list

e : not present => environment will be taken from caller's environ

4.execvp():

p : present => name of the program to run will be taken from filename specified or system will search for program file in PATH variable.

v : present => argument will be passed as array

e : not present => environment will be taken from caller's environ

5.execv():

p : not present => name of the program to run will be taken from pathname

v : present => argument will be passed as array

e : not present => environment will be taken from caller's environ

6.execl():

p : not present => name of the program to run will be taken from pathname

l : present => argument will be passed as list

e : not present => environment will be taken from caller's environ