micvol

#!/usr/bin/env bash
# one command to set, increase, decrease, mute, and
# display mic volume
# usage:
# micvol           -> displays the current volume
# micvol up/down   -> increase/decrease volume by 5%
# micvol 52%       -> set the volume to 52%
# micvol 17%+      -> increase the volume by 17%
# micvol 14%+      -> decrease the volume by 14%
# micvol mute      -> toggle volume mute (turns mute on/off)
# micvol bar       -> display volume as a bar

step="5"
if [[ -n "$1" ]]
then
  case $1 in
    up) val="${step}%+";;
    down) val="${step}%-";;
    mute) val="toggle";;
    bar) val="0%+" ;;
    *) val=$1;;
  esac
  # if + at start, move to end
  if [[ "${val:0:1}" == "+" ]]; then
    val="${val:1}${val:0:1}"
  fi
  amixer set Capture "$val" -q
fi
# display volume
vol=$(amixer get Capture | grep '\[.*' -o | uniq)
# print volume symbol according to percentage
if [[ "$1" == "bar" ]]; then
  output="$(vbar 0 100 "${vol:1:-7}")"
else
  output="${vol:1:-6}"
fi
case $vol in
  *off*) echo "";;
  *) echo " $output";;
esac