Emacs 26.1. Windows 10
In buffer I has text like this:
3333333
1111111
$PAC_LTC
1337_BTC
1337_LTC
404_BTC
42_BTC
222222
42_LTC
808_ETH
8BIT_BTC
8BIT_BTC
8BIT_BTC
8BIT_DOGE
8BIT_ETH
8BIT_LTC
ACC_DOGE
ACC_USDT
ACC_USDT
ADC_DOGE
ADC_DOGE
ADC_DOGE
ADC_ETH
ADC_USDT
8BIT_USDT
8BIT_USDT
42_ETH
I need to keep only duplicate lines. The result must be like this:
8BIT_BTC
8BIT_BTC
8BIT_BTC
8BIT_USDT
8BIT_USDT
ACC_USDT
ACC_USDT
ADC_DOGE
ADC_DOGE
ADC_DOGE
P.S. I try by this command: delete-non-matching-lines
But after press Enter
whole text delete from buffer.