Split a text line in UNIX file

[alhassani54]

Hi

I have a text UNIX file, the file contains one line and the line contains from 0 to thousands of characters.
Firstly, I want to check the line should not be larger than 20,000 characters.
Secondly, if the line is greater than 20,000 characters I want to split it to lines in a new file. Each line must not be greater than 20,000 characters.

Any help will be appreciated.

 

[feherke]

Hi

Assuming that only the first line of the input file has to be checked but all lines has to be wrapped.

[ `head -1 /input/file | wc -c` -gt 20000 ] && fold -w 20000 /input/file > /output/file

But if is sure that the input file always has only one line is more simple.

[ `wc -c < /input/file` -gt 20000 ] && fold -w 20000 /input/file > /output/file

Feherke.

http://rootshell.be/~feherke/