Can I change a field/column width in a script ?

Can I change a field/column width in a script to be run in SQL Plus? For example, I have a table where field COL1 is a varchar2(200). The table already has data in it. I would like to increase the width of field COL1 to be varchar2(300). Can I do this in a script ? Thank you.

No problem
alter table MYTABLE modify ( col1 varchar2(300) );

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