[英]Split single column of csv horizontally in bash into multiple smaller csv files in BASH
I am using bash and I have a single column (not row) in csv with no headers- samplefile.csv 我正在使用bash,并且在csv中只有一列 (不是行) ,没有标题-samplefile.csv
111
222
333
444
555
666
777
888
I am looking to split this into (say)2 csv files of 4 rows and a single column each in this case (if odd number say 9 rows then 5 and 4) csv files with data 在这种情况下,我想将其拆分为(说)2个4行和单个列的 csv文件(如果奇数说9行,那么5和4)带有数据的csv文件
output1.csv (1 column 4 rows) output1.csv(1列4行)
111
222
333
444
and output2.csv (1 column and 4 rows) 和output2.csv(1列4行)
555
666
777
888
Csplit does not create csv files as shown here split a file into x files where file names are numbered Csplit不会创建csv文件,如下所示: 将文件拆分为x个文件,文件名已编号
Any suggestions? 有什么建议么?
This is simple with awk
try awk '{print $0 > ("output"i+1".csv")}!(NR%4){i++}' file
. 使用awk
尝试使用awk '{print $0 > ("output"i+1".csv")}!(NR%4){i++}' file
。
Demo: 演示:
$ ls
file
$ cat file
111
222
333
444
555
666
777
888
$ awk '{print $0 > ("output"i+1".csv")}!(NR%4){i++}' file
$ ls
file output1.csv output2.csv
$ cat output1.csv
111
222
333
444
$ cat output2.csv
555
666
777
888
Explanation: 说明:
The modulus operator is key here, we want to split the input line after every fourth line: 模数运算符是此处的关键,我们要在每四行之后分割输入行:
$ awk '{print NR%4,$0}' file
1 111
2 222
3 333
0 444
1 555
2 666
3 777
0 888
The modulus (remainder) of four at every fourth is of course zero so we use this fact to increment the file counter. 当然,模数(余数)为四分之四为零,因此我们利用这一事实来增加文件计数器。 !(NR%4)
is shorthand for NR%4==0
as zero evaluates as false and NR%4
is zero when we want the block {i++}
to execute so we negative it. !(NR%4)
是NR%4==0
简写,因为当我们希望执行块{i++}
时,零评估为false,而NR%4
为零,因此我们将其否定。
$ awk '{print NR%4,$0,"output"i+1".csv"}!(NR%4){i++}' file
1 111 output1.csv
2 222 output1.csv
3 333 output1.csv
0 444 output1.csv
1 555 output2.csv
2 666 output2.csv
3 777 output2.csv
0 888 output2.csv
what are you looking for is just split command, with -n
option 您在寻找什么只是带有-n
选项的split命令
split -nl/2 input output
will do the job for you. 将为您完成这项工作。
from split man page: 从拆分手册页:
-n, --number=CHUNKS
generate CHUNKS output files. See 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 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
This worked for me. 这对我有用。 I opened the resulting csv in excel and it was formatted correctly. 我在excel中打开了生成的csv,并且其格式正确。 I haven't yet figured out how to remove the trailing comma, but that seems acceptable based on many csv format definition. 我还没有弄清楚如何删除结尾的逗号,但是根据许多csv格式定义,这似乎可以接受。 The first xargs call adds a comma to each line of the file. 第一个xargs调用将逗号添加到文件的每一行。 The second xargs batches four together. 第二个xargs一起批处理四个。 If you redirect that to a file (> new.csv) it may be what you are looking for. 如果将其重定向到文件(> new.csv),则可能是您要查找的文件。
>cat my.csv
111
222
333
444
555
666
777
888
>cat my.csv | xargs -n 1 -i echo \{\}, | xargs -n 4
111, 222, 333, 444,
555, 666, 777, 888,
I you can use split
command. 我可以使用split
命令。
n=
awk 'END{print int(NR/2)}' file_name
&& split -l $n file_name n =awk 'END{print int(NR/2)}' file_name
&& split -l $ n file_name
cat output1
111
222
333
444
cat output2
555
666
777
888
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