CentOS 中用 Split 命令分割文件的方法

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：

1. 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：

1. nowamagic00
2. nowamagic01
3. nowamagic02
4. nowamagic03
5. nowamagic04
6. nowamagic05
7. nowamagic06
8. nowamagic07
9. nowamagic08
10. 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。