sudo apt install ftp

ftp [OPTIONS] [hostname]

Usage: { ftp | pftp } [-46pinegvtd] [hostname]
   -4: use IPv4 addresses only
   -6: use IPv6, nothing else
   -p: enable passive mode (default for pftp)
   -i: turn off prompting during mget
   -n: inhibit auto-login
   -e: disable readline support, if present
   -g: disable filename globbing
   -v: verbose mode
   -t: enable packet tracing [nonfunctional]
   -d: enable debugging

$ ftp <target>

Connected to <target>
220-FileZilla Server 0.9.60 beta
220-written by Tim Kosse (tim.kosse@filezilla-project.org)
220 Please visit https://filezilla-project.org/
Name (<target>):

ftp> get Confidential.txt

local: Confidential.txt remote: Confidential.txt
200 PORT command successful.
125 Data connection already open; Transfer starting.
226 Transfer complete.
174 bytes received in 0.02 secs (9.1607 kB/s)

ftp> put Confidential.txt

local: Confidential.txt remote: Confidential.txt
200 PORT command successful.
125 Data connection already open; Transfer starting.
226 Transfer complete.
174 bytes received in 0.02 secs (9.1607 kB/s)

ftp> mget *.txt

mget Notes to do.txt?
200 PORT command successful.
125 Data connection already open; Transfer starting.
226 Transfer complete.
186 bytes received in 0.02 secs (10.9481 kB/s)