#!/bin/bash
cat << EOF | awk -F 'foo' 'NF>1{s=$0; $1=""; if (!index($0,"bar")) print s}'
foo 123
123 baz
bar foo baz
foo bar
baz bar
foo 111 foo bar
foo 999
EOF
IyEvYmluL2Jhc2gKCmNhdCA8PCBFT0YgfCBhd2sgLUYgJ2ZvbycgJ05GPjF7cz0kMDsgJDE9IiI7IGlmICghaW5kZXgoJDAsImJhciIpKSBwcmludCBzfScKZm9vIDEyMwoxMjMgYmF6CmJhciBmb28gYmF6CmZvbyBiYXIKYmF6IGJhcgpmb28gMTExIGZvbyBiYXIKZm9vIDk5OQpFT0Y=