Linux 下大文件切割与合并

-a: #指定输出文件名的后缀长度(默认为2个:aa,ab...) -d: #指定输出文件名的后缀用数字代替 -l: #行数分割模式(指定每多少行切成一个小文件;默认行数是1000行) -b: #二进制分割模式(支持单位:k/m) -C: #文件大小分割模式(切割时尽量维持每行的完整性) split [-a] [-d] [-l <行数>] [-b <字节>] [-C <字节>] [要切割的文件] [输出文件名]

# 行切割文件 $ split -l 300000 users.sql /data/users_ # 使用数字后缀 $ split -d -l 300000 users.sql /data/users_ # 按字节大小分割 $ split -d -b 100m users.sql /data/users_ ```bash **帮助信息** ```bash # 帮助信息 $ split --help 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 -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 '\0' (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:  Full documentation at:  or available locally via: info '(coreutils) split invocation'

-n: #显示行号 -e: #以$字符作为每行的结尾 -t: #显示TAB字符(^I) cat [-n] [-e] [-t] [输出文件名]

# 合并文件 $ cat /data/users_* > users.sql 帮助信息 # 帮助信息 $ cat --h Usage: cat [OPTION]... [FILE]... Concatenate FILE(s) to standard output. With no FILE, or when FILE is -, 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:  Full documentation at:  or available locally via: info '(coreutils) cat invocation'