CentOS 里切割大文件的命令如下：
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
generate suffixes of length N (default 2)
--additional-suffix=SUFFIX
append an additional SUFFIX to file names
-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[=FROM]
use numeric suffixes instead of alphabetic; FROM changes the start value (default 0)
-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 explanation below
-u, --unbuffered
immediately copy input to output with '-n r/...'
--verbose
print a diagnostic just before each output file is opened
--help display this help and exit
--version
output version information and exit
常用选项说明如下：
- -a : 指定后缀长度
- -b : 每个文件多少字节
- -d : 使用数字后缀而不是字母
- -l : 指定每个文件的行数
比如我想让后缀长度为 2，即 -a 2。用数字后缀 -d。每个文件 10M，即 -b 10m。命令可以设计如下：
- split -a 2 -d -b 10m /var/lib/mysql/general.log nowamagic
会在 /root 文件夹下生成下面的切割文件：
- nowamagic00
- nowamagic01
- nowamagic02
- nowamagic03
- nowamagic04
- nowamagic05
- nowamagic06
- nowamagic07
- nowamagic08
- nowamagic09
除了最后一个文件不是10M（有可能恰好10M，不过几率很小），其它都是。