Creating Junk File in Unix
How to create Junk file in Unix Generally Junk files are created for testing the application developed and so on. Here I have show four methods to create Junk files in Unix: Method 1: using dd dd if = /dev/zero of = filename.txt count = 1024 bs = 1024 bs--> Block Size. [1024 *1024 = 1MB file will be created] (or) dd if = /dev/zero of = filename.txt count = 1M bs = 1024 (1MB *1024=1GB file will be created) dd essentially copy that force to write every block of data (data will be unreadable but return 0) Method 2: using truncate truncate –S 10G file.txt It create a “sparse file” that cheats the file system and says that its has 10GB of data ,in other words it create a virtual data.This is fastest method for creating junk file. Method 3: using fallocate fallocate –L 10 G file.txt It will allocate a 10 GB in memory in disk (not sparse file) but we will not have to worry about the data, which means a...
