try this $read identifier
Code:
$read(filename, [ntswrp], [matchtext], [N])
Returns a single line of text from a file.

This identifier works in conjunction with the /write command.

//echo $read(funny.txt)

Reads a random line from the file funny.txt.

//echo $read(funny.txt, 24)

Reads line 24 from the file funny.txt.

//kick # $1 $read(kicks.txt)

Reads a random kick line from kicks.txt and uses it in the kick command.

//echo $read(info.txt, s, mirc)

Scans the file info.txt for a line beginning with the word mirc and returns the text following the match value.

//echo $read(help.txt, w,  *help*)

Scans the file help.txt for a line matching the wildcard text *help*. The r switch implies a regex match.

If you specify the s, w, or r switches, you can also specify the N value to specify the line you wish to start searching from in the file, eg.:

//echo $read(versions.txt, w, *mirc*, 100)

If the n switch is specified then the line read in will not be evaluated and will be treated as plain text.

If the p switch is specified, command | separators are treated as such instead of as plain text.

If the first line in the file is a number, it must represent the total number of lines in the file. If you specify N = 0, mIRC returns the value of the first line if it's a number.

If the t switch is specified then mIRC will treat the first line in the file as plain text, even if it is a number.