+ strings+=( "$x" )
+ done
+ else
+ strings=( "$@" )
+ fi
+
+ if $file_exists; then
+ # fix files with no newline at the end.
+ # the following command won't work right on them.
+ # e = run script, $a\ means append following text, but there is none,
+ # so sed only does what it always does when it was supposed to modify a file,
+ # which is append a newline if there was none.
+ sed -ie '$a\' "$file"
+ # this removes any trailing newline in the var, so we add it back on,
+ # because we want a consistent ending to match
+ local file_content
+ if $readsudo; then
+ file_content="$(sudo cat "$file")
+"
+ else
+ file_content="$(<"$file")
+"
+ fi
+ # we aren't using regex because we want to match strings,
+ # but we also want our match to start at the beginning of a line,
+ # or the beginning of the file, and to end at a line ending.
+ # So we do some slick bash to match this.
+ local start="?(*
+)"
+ local end="
+*"
+ for string in "${strings[@]}"; do
+ [[ $file_content != $start"$string"$end ]] && $writesudo tee -a "$file"<<<"$string"
+ done
+ else
+ for string in "${strings[@]}"; do
+ $writesudo tee -a "$file"<<<"${strings[@]}"