jnovack/append_once.sh

## append_once.sh
#!/bin/bash

function append_once() {
  while read data; do
    grep -q "$data" $1 || echo "$data" >> $1
  done
}

append_once ~/.bashrc <<EOF
  echo 'This line is only written once.'
EOF
	#!/bin/bash

	function append_once() {
	while read data; do
	grep -q "$data" $1 \|\| echo "$data" >> $1
	done
	}

	append_once ~/.bashrc <<EOF
	echo 'This line is only written once.'
	EOF