What is different between exec(), shell_exec, system() and passthru() functions in PHP?
68398
PHP exec() vs system() vs passthru()
51432
What does the "$#" special parameter mean in Bash?
94418
Where do we use the object operator "->" in PHP?
110913
Difference in accessing arrays in PHP 5.3 and 5.4 or some configuration mismatch?
150666
How to define global functions in PHP
100678
Understanding find(1)'s -exec option (curly braces & plus sign)
46581
Difference between passwd and passwd- file
27729
Why and how do you use anonymous functions in PHP?
4772
Difference between "not equal" operators  and != in PHP
54728
What is the difference between shell, console, and terminal?
62401
PHP CLI and Bash - change behaviour of PHP keyword
86391
Why are non-environment variables passed to the subshell invoqued by command substitution?
139274
What's the difference between 'sudo [command]' and 'sudo sh [command]?
9173
What are the PHP operators "?" and ":" called and what do they do?
33687
Why is echo a shell built in command?
96938
What's the difference between using > and >> in shell?
29593
What is the "->" PHP operator called?