vi opening a file

To open a file in read-only.
$)view practice.c
or
$)vi -R practice.c

To open a file at line number [10]
$) vi +10 practice.c

To open a file at a particular sequence

$)vi +/main practice.c

VI commands to move in the file

List of vi movement commands

Scroll forward one screen. ^F
Scroll backward one screen. ^B
Scroll forward half screen. ^D
Scroll backward half screen. ^U
Redraw the screen. ^L
Move to top line of screen. H
Move to middle line of screen. M
Move to bottom line of screen. L
Move to column n of current line. n|
Go to given line n. nG
Go to end of file. G
Return to previous mark or context. ``
Show current line. ^G