How to split one text file into multiple *.txt files?

$ split -l 100 input_file output_file

where -l is the number of lines in each files. This will create:

You can use the linux bash core utility split

split -b 1M -d  file.txt file

Note that M or MB both are OK but size is different. MB is 1000 * 1000, M is 1024^2

If you want to separate by lines you can use -l parameter.

UPDATE

a=(`wc -l yourfile`) ; lines=`echo $(($a/12)) | bc -l` ; split -l $lines -d  file.txt file

Another solution as suggested by Kirill, you can do something like the following

split -n l/12 file.txt

Note that is l not one, split -n has a few options, like N, k/N, l/k/N, r/N, r/k/N.

John's answer won't produce .txt files as the OP wants. Use:

split -b=1M -d  file.txt file --additional-suffix=.txt

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