Linux 大文件的分割与合并
发布时间:2020-12-13 23:43:31 所属栏目:Linux 来源:网络整理
导读:1.分割 -- split命令 可以指定按行数分割和按字节大小分割两种模式。 (1) 按行数分割 $ split -l 300 large_file.txt new_file_prefix 加上-d,使用数字后缀;加上--verbose,显示分割进度: $ split -l50000 -d large_file.txt part_ --verbose (2)?按字
1.分割 -- split命令 可以指定按行数分割和按字节大小分割两种模式。 (1) 按行数分割 $ split -l 300 large_file.txt new_file_prefix 加上-d,使用数字后缀;加上--verbose,显示分割进度: $ split -l50000 -d large_file.txt part_ --verbose (2)?按字节大小分割 $ split -b 10m large_file.log new_file_prefix ? 2.合并 -- cat命令 $ cat part_* > merge_file.txt ? [注]?split命令语法: $ split --h Usage: split [OPTION]... [FILE [PREFIX]] Output pieces of FILE to PREFIXaa,PREFIXab,...; default size is 1000 lines,and default PREFIX is ‘x‘. With no FILE,or when FILE 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) 后缀名称的长度 (默认为2) --additional-suffix=SUFFIX append an additional SUFFIX to file names -b,--bytes=SIZE put SIZE bytes per output file 每个输出文件的字节大小 -C,--line-bytes=SIZE put at most SIZE bytes of records per output file 每个输出文件每行的最大字节大小 -d use numeric suffixes starting at 0,not alphabetic 使用数字后缀代替字母后缀 --numeric-suffixes[=FROM] same as -d,but allow setting the start value -e,--elide-empty-files do not generate empty output files with ‘-n‘ 不产生空的输出文件 --filter=COMMAND write to shell COMMAND; file name is $FILE 写入到shell命令行 -l,--lines=NUMBER put NUMBER lines/records per output file 设定每个输出文件的行数,默认行数是1000行 -n,--number=CHUNKS generate CHUNKS output files; see explanation below 产生chunks文件 -t,--separator=SEP use SEP instead of newline as the record separator; 使用新字符分割 ‘ ‘ (zero) specifies the NUL character -u,--unbuffered immediately copy input to output with ‘-n r/...‘ 无需缓存 --verbose print a diagnostic just before each 显示分割进度 output file is opened --help display this help and exit 显示帮助信息 --version output version information and exit 显示版本信息 The SIZE argument is an integer and optional unit (example: 10K is 10*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/records l/K/N output Kth of N to stdout without splitting lines/records 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/> Full documentation at: <http://www.gnu.org/software/coreutils/split> or available locally via: info ‘(coreutils) split invocation‘ ? cat命令语法: $ cat --h Usage: cat [OPTION]... [FILE]... Concatenate FILE(s) to standard output. With no FILE,read standard input. -A,--show-all equivalent to -vET -b,--number-nonblank number nonempty output lines,overrides -n -e equivalent to -vE -E,--show-ends display $ at end of each line -n,--number number all output lines -s,--squeeze-blank suppress repeated empty output lines -t equivalent to -vT -T,--show-tabs display TAB characters as ^I -u (ignored) -v,--show-nonprinting use ^ and M- notation,except for LFD and TAB --help display this help and exit --version output version information and exit Examples: cat f - g Output f‘s contents,then standard input,then g‘s contents. cat Copy standard input to standard output. GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Full documentation at: <http://www.gnu.org/software/coreutils/cat> or available locally via: info ‘(coreutils) cat invocation‘ (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |