Linux : Create a 1G empty file

# dd if=/dev/zero of=1g.img bs=1G count=1
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 54.018 s, 19.9 MB/s

# ll 1g.img
-rw-r----- 1 root root 1073741824 Jan 22 14:03 1g.img

# stat 1g.img
  File: `1g.img'
  Size: 1073741824      Blocks: 2105424    IO Block: 65536  regular file
Device: 13h/19d Inode: 97          Links: 1
Access: (0640/-rw-r-----)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2015-01-22 14:03:05.231563000 -0500
Modify: 2015-01-22 14:03:59.115150000 -0500
Change: 2015-01-22 14:03:59.115150000 -0500