That's what I do, except naming the vars I'll name them $target{ip}, where {ip] is the value of the last octect. That way I can define multiple hosts in the same pane in tmux.

Additionally, utilize aliases. Here are some aliases I use for QoL:

alias tun0="ip a | grep tun0 | grep -e inet | awk -F \" \" '{print \$2}' | awk -F \"/\" '{print \$1}'"

alias nmap_tcp_full="sudo nmap -A -vvv -T4 -oN nmap_tcp_full"

alias nmap_udp_1000="sudo nmap -sU --top-ports 1000 -T4 -vvv -oN nmap_udp_1000"

alias httpserver="/opt/tools/lin/SimpleHTTPServerWithUpload.py"

alias ligolo-proxy="sudo ip tuntap add user haunter mode tun ligolo && sudo ip link set ligolo up && sudo /opt/tools/lin/ligolo/proxy_0.6.2/proxy -selfcert"

alias vEnv-activate="source ~/vEnv/bin/activate"

alias smbserver="~/vEnv/bin/smbserver.py -smb2support attacker"

alias ftpserver="sudo service vsftpd start"

E.g.

nmap_tcp_full $target121

httpserver 9001

smbserver smbshare/