这里有一个例子，把文件“toSplit.txt”分成200行小文件“splited00.txt”，splited01.txt，…"splited25.txt"…

split -l 200——numeric-suffix——additional-suffix=".txt

split(来自GNU coreutils，从2010-12-22版本8.8开始)包含以下参数:

-n, --number=CHUNKS     generate CHUNKS output files; see explanation below

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

因此，split -n 4输入输出。将生成四个具有相同字节数的文件(output.a{a,b,c,d})，但行可能在中间被打断。

如果我们想保留完整的行(即按行分割)，那么这应该是有效的:

split -n l/4 input output.

相关答案:https://stackoverflow.com/a/19031247

你也可以使用AWK:

awk -vc=1 'NR%200000==0{++c}{print $0 > c".txt"}' largefile

Use:

sed -n '1,100p' filename > output.txt

这里，1和100是您将在output.txt中捕获的行号。

HDFS getmerge小文件并分割成合适的大小。

这个方法会导致换行:

split -b 125m compact.file -d -a 3 compact_prefix

我尝试为每个文件getmerge和分割成大约128 MB。

# Split into 128 MB, and judge sizeunit is M or G. Please test before use.

begainsize=`hdfs dfs -du -s -h /externaldata/$table_name/$date/ | awk '{ print $1}' `
sizeunit=`hdfs dfs -du -s -h /externaldata/$table_name/$date/ | awk '{ print $2}' `
if [ $sizeunit = "G" ];then
    res=$(printf "%.f" `echo "scale=5;$begainsize*8 "|bc`)
else
    res=$(printf "%.f" `echo "scale=5;$begainsize/128 "|bc`)  # Celling ref http://blog.csdn.net/naiveloafer/article/details/8783518
fi
echo $res
# Split into $res files with a number suffix. Ref:  http://blog.csdn.net/microzone/article/details/52839598
compact_file_name=$compact_file"_"
echo "compact_file_name: "$compact_file_name
split -n l/$res $basedir/$compact_file -d -a 3 $basedir/${compact_file_name}

将“file.txt”文件拆分为10,000行文件:

split -l 10000 file.txt