Fundamental related of a bash builtin command named “if”

ABOUT if

Conditionals have many forms. The most basic form is: if expression then statement where
'statement' is only executed if 'expression' evaluates to true. '21' evaluates to true.xs

TYPICAL SHELL EXPOSURE
[bash]
$if true; then echo "works" ; fi
works
$if false; then echo "works" ; fi
$
[/bash]

LINK
https://stackoverflow.com/questions/16034749/if-elif-else-statement-issues-in-bash
http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-6.html