ZW - Write append.

Syntax:

ZW options

Examples:

zw
zwx myfile
3,5zwb bcdfile

Options:

options: include all the options that can be supplied with the W command.

Description:

ZW command behaves exactly like the W command (see "expl fred w"), with one exception: text written by W overwrites the current contents of a file, while text written by ZW is appended to the end of the current contents.