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Free Open Source:

Swiss File Knife

a command line
multi function tool.

remove tabs
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find text
filter lines
find in path
collect text
instant ftp or
http server
file transfer
send text
patch text
patch binary
run own cmd
convert crlf
dup file find
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split and join large binary and text files

, using the sfk split command for Windows, Mac OS X, Linux and Raspberry Pi, to enable transport or archiving on size limited media like usb stick, dvd or cd, or to work around file system limitations.
- download the free Swiss File Knife Base from Sourceforge.
- open the Windows CMD command line, Mac OS X Terminal or Linux shell.
- OS X : type mv sfk-mac-64.exe sfk and chmod +x sfk then ./sfk
- Linux: type mv sfk-linux-64.exe sfk    and chmod +x sfk then ./sfk
  OS X and Linux syntax may differ, check the help within the tool.
sfk split partsize inputfile [outputfilebase] [-nov[erify]]

reads and splits inputfile into output files of specified size.
if output files exist already, split asks if it may overwrite;
specify -yes to overwrite outputs without asking.

partsize syntax:
    100000b  ,  100k        = 100000 bytes
    2000000k , 2000m , 2g   = 2 giga-bytes

if outputfilebase is omitted, outputfilenames will be:
if outputfilebase is given, .part1 is appended to this.

   -yes         always overwrite existing output files.
   -nov[erify]  no verify after split.
   -altsize     use different method (fseek) to read the
                file size.
   -getsize=n[:d] before splitting, read file size n times
                with a delay of d milliseconds (default=100).
   -verbose     be verbose about file size results etc.
   -buffer=xm   set I/O buffer to x MB (default=100 MB).
   -update      do not rewrite existing parts of full size.
                useful when splitting repeatedly a growing
                input file, e.g. during a download.
                -update implies -yes.
   -dig[its]=n  set minimum number of digits used for the
                .part extension. since sfk 1.6.5, sfk join
                will autodetect the number of digits.
                if output will be joined with older versions
                of sfk then -digits must stay default (1).
   -text        split at line boundaries if possible.
                cannot be combined with -update.

performance notes
   the operating system may cache output files, writing
   to disk in background after sfk has finished. subsequent
   split commands may run slower, even if -noverify is used.

web reference

   sfk split 2g c:\bigfish.avi d:\transfer\easy.avi
      splits bigfish.avi into easy.avi.part1, .part2 etc.

   to rejoin the files, use the sfk join command:

   sfk join d:\transfer\easy.avi.part1 e:\full.avi
      joins easy.avi.part1, .part2 etc. into full.avi
splitting text files by no. of lines:

   this is not yet supported by sfk, but for example the
   cygwin split command supports this. cygwin is a large
   package of commands, requiring some installation.
   if you have it installed, type for example

      split --lines=10000 biginput.txt outprefix

   which creates output files outprefixaa, outprefixab etc.

see also:

   sfk partcopy - copy a single byte block from a binary file
   sfk hexdump  - dump parts of a file for further analysis
   sfk snapto   - joins all text files of a directory

sfk is a free open-source tool, running instantly without installation efforts. no DLL's,
no registry changes - just get sfk.exe from the zip package and use it (binaries for
windows, linux and mac are included).

read more about all sfk functions here.

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