To split large files into smaller files in Unix, use the split
command. To do so, 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:
-l linenumber
-b bytes
If you use the -l (the letter l) option, replace linenumber with the
number of lines you'd like in each of the smaller files (the default
is 1,000). If you use the -b option, replace bytes with the number
of bytes you'd like in each of the smaller files.
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
In this simple example, assume myfile is 3,000 lines long.
split myfile
This will output three files, xaa, xab, and xac, and each one will be
1,000 lines long.
Working on the same file, this next example is more complex:
split -l 500 myfile segment
This will output six 500-line files: segmentaa, segmentab, segmentac,
segmentad, segmentae, and segmentaf.
Finally, assume myfile is a 160KB file:
split -b 40k myfile segment
This will output four 40KB files: segmentaa, segmentab, segmentac, and segmentad.
For more information, consult the man page for the split command. At
the Unix prompt, enter:
man split
You may also wish to investigate the 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
Reference: http://kb.indiana.edu/data/afar.html?cust=035665.12647.30 |
