Convert tabs in each FILE to spaces, writing to standard output. With no
FILE, or when FILE is \-, read standard input.
.PP
-Mandatory arguments to long options are mandatory for short options too.
+長いオプションでの必須の引き数は、短いオプションにおいても必須です。
.TP
\fB\-i\fP, \fB\-\-initial\fP
do not convert tabs after non blanks