Convenience function for using RDP transparently across RHEL versions

rdesk.sh

#!/bin/bash

# Returns current screen size in format 'XxY'. Assumes all monitors are same resolution, if >1
function getres() {
    xrandr --current | grep '\*' | uniq | awk '{print $1}'
}

# Returns the RHEL major version of the current host (e.g. '6' or '7')
function get_rhel_version() {
    lsb_release -i -r | grep Release | awk '{print $2}' | awk -F . '{print $1}'
} 

# Shortcut to open up an rdesktop session
function rdesk() {
    local host
    if [ -n "$1" ]; then
        host="$1"
        shift
    else
        host="gbtsb"
    fi

    local x
    local x_scaled
    local x_scale_factor
    x_scale_factor="1"
    y_scale_factor=".95"
    x=$(getres | cut -d 'x' -f1)
    x_scaled=$(python -c "print(int(${x} * $x_scale_factor))")
    local y
    local y_scaled
    y=$(getres | cut -d 'x' -f2)
    y_scaled=$(python -c "print(int(${y} * $y_scale_factor))")
    echo "Connecting to $host as $USER, scaled to: ${x_scaled}x${y_scaled} from current (single-monitor) resolution of: ${x}x${y}"
    
    if [ "$(get_rhel_version)" == "6" ]; then
        echo rdesktop -u "AD\\${USER}" -p - -g "${x_scaled}x${y_scaled}" "$host" "$@"
        rdesktop -u "AD\\${USER}" -p - -g "${x_scaled}x${y_scaled}" "$host" "$@"
    else
        echo xfreerdp "/size:${x_scaled}x${y_scaled}" /bpp:16 /d:"AD" /v:"$host" /u:"$USER" "$@"
        xfreerdp "/size:${x_scaled}x${y_scaled}" /bpp:16 /d:"AD" /v:"$host" /u:"$USER" "$@"
    fi
}

Usage is pretty simply. Put the above in your .bash_profile, and:

$ rdesk

Or, for a specific host:

$ rdesk foohost