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To split large files into smaller files in Unix, use the split  command. At the Unix prompt, enter:

split [options] filename prefix 

Replace filename with the name of the large file you wish to split. Replace prefix with the name you wish to give the small output files. You can exclude [options ], or replace it with either of the following:

The split  command will give each output file it creates the name prefix  with an extension tacked to the end that indicates its order. By default, the split  command adds aa  to the first output file, proceeding through the alphabet to zz  for subsequent files. If you do not specify a prefix, most systems use  x .

Examples

For more information, consult the man page for the split  command. At the Unix prompt, enter:

man split

csplit  command

There is also csplit  command, which splits files based on context. For more information, see the man page for the csplit  command. At the Unix prompt, enter:

man csplit

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[Nov 23, 2009] Merging Split Files

October 11th, 2007

Jesus asks: I have a question about the split Command… How can I "come back" to "largefile" from 126 small files?It sounds like the split command was used? If so, then you can use a for loop with file concatenation. First, I will split the files for my example:

$ ls -l big.log
-rw-rw-r--  1 brock brock 175743061 Oct 11 22:08 big.log
$ expr 175743061 \/ 126
1394786
$ split -b 1394786 big.log
$ ls -1 x*
xaa
xab
...
xew

Split creates its output files in decreasing alphabetic order. Thus when you list them in the shell they are in the order in which
they were split. As such, you can simply use cat to merge the files. (Thanks to Paul and Davidov for pointing out my for loop was superfluous.)

$ cat x* >merged.big.log
$ ls -l *.log
-rw-rw-r--  1 brock brock 175743061 Oct 12 22:08 big.log
-rw-rw-r--  1 brock brock 175743061 Oct 12 01:11 merged.big.log
$ diff merged.big.log big.log
$ md5sum *.log
47de08911534957c1768968743468307  big.log
47de08911534957c1768968743468307  merged.big.log

Recommended Links

Merging Split Files

HJSplit - Download Windows utility with similar functionality



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