aws_completion_script.sh

# completion script for above awss function
# If you change your function name, replace your function name with here awss
# the grep I used here is quite important and may be not work with your profile without simple tweak
# Simple logic is you have to have a command that returns all of the profile in aws config
_awss_completion()
{
    local cur prev opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    opts=`(grep '\[profile' ~/.aws/config  | cut -d ' ' -f 2 | cut -d ']' -f 1)`

    if [[ ${cur} == * ]] ; then
        #COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
        COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) )
        return 0
    fi
} && complete -F _awss_completion awss

aws_profile_switch_function.sh

# Simple function to switch aws profiles with the help of awsudo
# function name awss (with extra 's') just used for easiness and laziness (just one more key push)
# you can change fucntion name as you wish but remember to use the same in auto-complete code too.

function awss(){
  FILEPATH="/tmp/temp-env.txt"
  if [ "$#" -le 1 ] ; then
    echo  "Run awss command to switch profile.\n\tUsage: awss <profile-name> <any-other-optional-command(s)>.\n\t\tExample: awss admin-test-aws-acc-1 \n\t\tExample: awss read-test-aws-acc-2 aws s3 ls"
    awsudo "${1}" > $FILEPATH
    while read p; do
      export "${p}"
    done <$FILEPATH
    export AWS_PROFILE=${1}
  else
    export AWS_PROFILE=${1}
    awsudo "${1}" -- "${2}" "${@:3}"
  fi 
  if [ -f "$FILEPATH" ] ; then
    rm "$FILEPATH"
  fi
}

Have fun switching AWS profiles with bash auto-completion.