[Help] Insert random texts to a specific line of .txt file

[thanhca]

Hello,

I need a tool that can insert random texts to a specific line of .txt file

example: I have a file: test.txt

line1: abcd
line2:
line3: efgh
line4: ijkl

I want insert random texts to empty line2:

123
456
789

Output file:

line1: abcd
line2: 456
line3: efgh
line4: ijkl

I don't know any tool to do it. I need insert random text to thousands of .txt files. Please help me. Thanks.

[Psyrus]

Is it project reality related?