按时间查看日志
日志文件有40G：
sed -n '/2020-05-02 15:00:/,/2020-05-02 15:05:/p' catalina.out > 20200502.log大文件分割
split命令操作
[root@iZ2ze2pmuviyporobybycvZ ~]# split --help
Usage: split [OPTION]... [INPUT [PREFIX]]
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
SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units
are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000).
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
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'split invocation'按文件行数分割
catalina.out 按50000分割一个文件：
split -l 50000 -d --verbose catalina.out base-split-name
#输出
base-split-name00
base-split-name01
base-split-name02
......按文件大小分割
除了按照行数切割之外，split还支持通过文件大小进行切割，通过指定-b参数指定文件大小进行切割，文件大小单位支持K, M, G, T, P, E, Z，如下以切割为500M演示文件切割过程。
split -b 500M -d --verbose catalina.out base-split-name
#输出
base-split-name00
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