dividir arquivos grandes com o comando split

SPLIT(1)                                                                    User Commands                                                                   SPLIT(1)

NAME
       split - split a file into pieces

SYNOPSIS
       split [OPTION]... [INPUT [PREFIX]]

DESCRIPTION
       Output fixed-size pieces of INPUT to PREFIXaa, PREFIXab, ...; 
default size is 1000 lines, and default PREFIX is `x'.  
With no INPUT, or when INPUT is -, read
       standard input.

       Mandatory arguments to long options are mandatory for short 
options too.

       -a, --suffix-length=N
              use suffixes of length N (default 2)

       -b, --bytes=SIZE
              put SIZE bytes per output file

       -C, --line-bytes=SIZE
              put at most SIZE bytes of lines per output file

       -d, --numeric-suffixes
              use numeric suffixes instead of alphabetic

       -e, --elide-empty-files
              do not generate empty output files with `-n'

       --filter=COMMAND
              write to shell COMMAND; file name is $FILE

       -l, --lines=NUMBER
              put NUMBER lines per output file

       -n, --number=CHUNKS
              generate CHUNKS output files.  See below

       -u, --unbuffered
              immediately copy input to output with `-n r/...'

       --verbose


       --help display this help and exit

       --version
              output version information and exit

       SIZE may be (or may be an integer optionally followed by) 
one of following: KB 1000, K 1024, MB 1000*1000, M 1024*1024, 
and so on for G, T, P, E, Z, Y.

       CHUNKS may be: N       split into N files based on size of
 input K/N     output Kth of N to stdout l/N     
split into N files without splitting  lines  l/K/N
       output Kth of N to stdout without splitting lines r/N     
like `l' but use round robin distribution r/K/N   
likewise but only output Kth of N to stdout


Exemplo #1:
split --bytes=10M /caminhodoarquivo grande/ /caminhoparaoarquivomenor

cat X* > arquivo de destino


Exemplo #2:
split -b 1440k arquivo_grande.gz

cat xaa xab xac xad > arquivo_grande.gz


Exemplo #3:
split -b 1M arquivo_a_dividir

cat primeira_parte* > nome_arquivo_final

Exemplo #4:
split -b 500M portal.zexp \#128921/portal.zexp-
$ tree \#128921/
#128921/
├── portal.zexp-aa
└── portal.zexp-ab

cat \#128921/* > portal.zexp

Atualizações

20150725;

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fatorar e reagrupar arquivos

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