list open ssh connections and show menu to connect

ossh.sh

#!/bin/bash
# Description: Show current ssh client connections and
#              establish further one if requested.
set -e

# Define optional exclude regex.
EXCLUDE_RE=""

count=1
ssh_client_pids=$( lsof -n -iTCP -sTCP:ESTABLISHED | awk '/^ssh/{print
$2}' )

if [[ -z $ssh_client_pids ]]; then
    echo "No established ssh connection found."
    exit
fi

for pid in $ssh_client_pids; do
    # Insert space between cmd parameters via xargs.
                ssh_client_cmd="$( ps -eo pid,args | awk -v pid=$pid '$1 ~ pid && $2 ~/ssh/{$1=""; print $0}' )"
    if [[ $ssh_client_cmd =~ ${EXCLUDE_RE:-^$} ]]; then
        continue
    else
        echo "[$count] $ssh_client_cmd"
        array[$count]="$ssh_client_cmd"
        count=$(( $count+1 ))
    fi
done

# Exit if array has no content.
if [[ $count = 1 ]]; then
    echo "No ssh connections for reuse available."
    exit
fi

printf "%s " "Enter connection id:"
read connection_id
if [[ ! $connection_id =~ ^([1-9][0-9]*|$) ]]; then
    echo "Only positive integers allowed."
    exit
else
    # Use id 1 if $connection_id is unset.
    ${array[${connection_id:-1}]}
fi