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Top Forums UNIX for Advanced & Expert Users Command to output ones (like zero-fill), with progress indicator Post 302449761 by Gliktch on Tuesday 31st of August 2010 12:08:39 PM
Old 08-31-2010
Lightbulb Command to output ones (like zero-fill), with progress indicator

Well, I was originally going to post this snippet in the original thread titled "how to output ones endlessly like /dev/zero", but that topic was closed without an efficient answer.

It was difficult to find (build) a satisfactory answer to this one, so I thought I'd share it here and as a "fill hard drive with ones like zero-fill" entry on commandlinefu.

This command seems to get me about 500MByte/min, though this is with a 1.5TB 'green' drive running only at 5400rpm so I imagine it'd be faster in most other cases.
Code:
tr '\000' '\377' < /dev/zero | dd bs=512 count=[drive bytes/512] status=noxfer | pipebench | sudo dd of=[output disk/partition, e.g. /dev/sdb]

Hope that helps someone Smilie
- Gliktch

P.S: Note that pipebench is required - this is probably available in your distro's repositories Smilie
 

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mount_pcfs(1M)						  System Administration Commands					    mount_pcfs(1M)

NAME
mount_pcfs - mount pcfs file systems SYNOPSIS
mount -F pcfs [generic_options] [-o FSType-specific_options] special | mount_point mount -F pcfs [generic_options] [-o FSType-specific_options] special mount_point DESCRIPTION
mount attaches an MS-DOS file system (pcfs) to the file system hierarchy at the mount_point, which is the pathname of a directory. If mount_point has any contents prior to the mount operation, these are hidden until the file system is unmounted. If mount is invoked with special or mount_point as the only arguments, mount will search /etc/vfstab to fill in the missing arguments, including the FSType-specific_options; see mount(1M) for more details. The special argument can be one of two special device file types: o A floppy disk, such as /dev/diskette0 or /dev/diskette1. o A DOS logical drive on a hard disk expressed as device-name:logical-drive , where device-name specifies the special block device-file for the whole disk and logical-drive is either a drive letter (c through z) or a drive number (1 through 24). Examples are /dev/dsk/c0t0d0p0:c and /dev/dsk/c0t0d0p0:1. The special device file type must have a formatted MS-DOS file system with either a 12-bit, 16-bit, or 32-bit File Allocation Table. OPTIONS
generic_options See mount(1M) for the list of supported options. -o Specify pcfs file system specific options. The following options are supported: foldcase|nofoldcase Force uppercase characters in filenames to lowercase when reading them from the filesystem. This is for compatibility with the pre- vious behavior of pcfs. The default is nofoldcase. FILES
/etc/mnttab table of mounted file systems /etc/vfstab list of default parameters for each file system ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ SEE ALSO
mount(1M), mountall(1M), mount(2), mnttab(4), vfstab(4), attributes(5), pcfs(7FS) NOTES
If the directory on which a file system is to be mounted is a symbolic link, the file system is mounted on the directory to which the sym- bolic link refers, rather than on top of the symbolic link itself. SunOS 5.10 24 Nov 2003 mount_pcfs(1M)
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