Identifying and removing null characters in UNIX

Use the following sed command for removing the null characters in a file.

sed -i 's/\x0//g' null.txt

this solution edits the file in place, important if the file is still being used. passing -i'ext' creates a backup of the original file with 'ext' suffix added.

I’d use tr:

tr < file-with-nulls -d '\000' > file-without-nulls

If you are wondering if input redirection in the middle of the command arguments works, it does. Most shells will recognize and deal with I/O redirection (<, >, …) anywhere in the command line, actually.