Unix file tricks

Create dummy file in UNIX

$ dd if=/dev/zero of=testfile count=252400 bs=10240
This will create a 2.5GB file. This can be used to test, if the files system supports 2g+ files.

Changing the existing UNIX file to 0 byte file
$ cat /dev/null > filename

Erasing the disk

dd if=/dev/zero of=/dev/raw/c1t0d7s6 bs=1048576 count=100
The dd utility copies the specified input file to the specified output.

Description for used options:

Read from file/device.

Write to file/device.

Set both input and output block sizes to bytes (1MB in this case).

Copy Number of blocks from the input file

This puts zeroes to the first 100 MB of disk /dev/raw/c1t0d7s6, erasing all information.

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