fold

行の折り返し。マルチバイトでは、いまいち。

 使用法: fold [オプション]... [ファイル]...
 Wrap input lines in each FILE (standard input by default), writing to
 standard output.
  
 Mandatory arguments to long options are mandatory for short options too.
   -b, --bytes         count bytes rather than columns
   -s, --spaces        break at spaces
   -w, --width=WIDTH   use WIDTH columns instead of 80
       --help          display this help and exit
       --version       output version information and exit