Add or remove a trailing newline

Lines usually end with a newline character. So a text file usually ends with a newline character. Sometimes you might want to add or remove this newline character. You can use these functions to help you.

Add a trailing newline to the end of a buffer

# Add a trailing newline to the end of a buffer.
# usage: <at
# This function uses the label z.
function:at {
$X
kz
s/$/\n\n/f
'z+X
;g/^$/fd
}

Remove a trailing newline from the end of a buffer

# Remove a trailing newline from the end of a buffer.
# usage: <rt
function:rt {
db0
H-
ebvar+
$X
.v/^$/fr !echo -n '.
if(*) {
-d
}
}