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Full Discussion: How to generate a large file in Linux ?
Top Forums UNIX for Beginners Questions & Answers How to generate a large file in Linux ? Post 303003021 by drl on Wednesday 6th of September 2017 04:01:54 PM
Old 09-06-2017
Hi.

Some repetition, but also:
Code:
Generate specific-size file

        0) "dd", and other than Linux at:
           https://stackoverflow.com/questions/257844/quickly-create-a-large-file-on-a-linux-system

        1) mkfile (local), work-alike based on Solaris mkfile, q.v., dd wrapper
           Original from http://steve-parker.org/

        2) xfs_mkfile, part of xfsprogs, resides in /usr/sbin/
           Not restricted to XFS filesystems

        3) fallocate, preallocate or deallocate space to a file

        4) wsf (local), Write, create, sized file

        5) setosi (local), Set to size (length): make files same number of lines

        6) truncate, shrink or extend the size of a file to the specified size

Best wishes ... cheers, drl
These 3 Users Gave Thanks to drl For This Post:
apmcd47 kraljic rbatte1
 

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LEARN ABOUT MINIX

mkfile

mkfile(1M)                                                                                                                              mkfile(1M)

NAME

       mkfile - create a file

SYNOPSIS

       mkfile [-nv] size [g | k | b | m]   filename...

       mkfile  creates  one  or  more files that are suitable for use as NFS-mounted swap areas, or as local swap areas. When a root user executes
       mkfile(), the sticky bit is set and the file is padded with zeros by default.   When non-root users execute  mkfile(), they  must  manually
       set the sticky bit using  chmod(1). The default size is in bytes, but it can be flagged as gigabytes, kilobytes, blocks, or megabytes, with
       the g, k, b, or m suffixes, respectively.

       -n       Create an empty filename. The size is noted, but disk blocks are not allocated until data is written to them. Files  created  with
                this option cannot be swapped over local UFS mounts.

       -v       Verbose.  Report the names and sizes of created files.

USAGE

       See largefile(5) for the description of the behavior of mkfile when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

       chmod(1), swap(1M), attributes(5), largefile(5)

                                                                    2 Feb 2001                                                          mkfile(1M)
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