File - Create a null/empty file

[petulia3478]

Empty files are normally used for performance or to create file system swap.

AIX
Use lmktemp
eg. Create a a 2GB file, size in bytes

# lmktemp 2GBtest 2000000000

HP-UX
Use prealloc
eg.

# prealloc /tmp/bigfile 409600000

Solaris
Use mkfile
eg. Create a empty file of 4Gb

# mkfile 4000m  /tmp/bigfile