Provided that each line has a WIF key and not other format
Is it possible with Bitcoin Core as well?
How about exporting? I want to export all of my keys in one go possibly in one file with one line per key.
Possibly WIF keys but that's not important, i may run a script that converts them to WIF
https://bitcointalksearch.org/topic/m.9805886
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey Ky2EGjWLhfKv1sWnPcuN4SHF2iALj6SfK7hoLWKx5T4zMqXg7aT9 addr-1DfyaDvr-2 false
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey KzrZ4DULdVWFqpF48pdJicFJfX5dqrhxBkqDnT4HRkCswdFy3Eo4 addr-1DfyaDvr-3 false
"C:\Program Files\Bitcoin\daemon\bitcoind.exe" importprivkey L2ELWXewr1PQnMwFDpfobHFqspyM6g1noM4uzkCMgoSZTSf3sQJF addr-1DfyaDvr-4 false
im not sure how the actual importing would go, but seems like you can work your way through it starting with this.
really though, if youre going to import 1500 keys use a light wallet. unless you set scan to false, its going to take an absurdly long time.