Output uptime of mysql in clean and human-readable format

mysql_uptime.sh

#/bin/sh

# Prints the uptime of mysql 
# Optional: Takes one argument for the servername, default is localhost

# Set $host
if [ $1 ]; then
  host=$1
else
  host="localhost"
fi

#Get Uptime in seconds from mysql server
s=`mysql -h $host --skip-column-names -e "select VARIABLE_VALUE from information_schema.GLOBAL_STATUS where VARIABLE_NAME='Uptime';"`

#Takes seconds, outputs human readable time
#Function Source: http://unix.stackexchange.com/a/170299/17808
converts()
{
  local t=$1

  local d=$((t/60/60/24))
  local h=$((t/60/60%24))
  local m=$((t/60%60))
  local s=$((t%60))

  if [[ $d > 0 ]]; then
    [[ $d = 1 ]] && echo -n "$d day " || echo -n "$d days "
  fi
  if [[ $h > 0 ]]; then
    [[ $h = 1 ]] && echo -n "$h hour " || echo -n "$h hours "
  fi
  if [[ $m > 0 ]]; then
    [[ $m = 1 ]] && echo -n "$m minute " || echo -n "$m minutes "
  fi
  if [[ $d = 0 && $h = 0 && $m = 0 ]]; then
    [[ $s = 1 ]] && echo -n "$s second" || echo -n "$s seconds"
  fi
  echo
}

#Convert seconds to readable time
converts $s