common functional scripts

common.sh

# strip white spaces and tabs from string
string_trim() {
  local str=$1
  echo "$str" | sed -E 's/^[ \t]*//' | sed -E 's/[ \t]*$//'
}

# convert string to lower case
string_lower() {
  local str=$1
  echo "$str" | tr "[:upper:]" "[:lower:]"
}

math_calc() {
  local format="$1"
  local equation="$2"

  echo | awk "{printf \"$format\", $equation}"
}

math_compare() {
  local comparison=$1
  if [ $(echo "$comparison" | bc -l) -eq 1 ]; then
    return 0
  else
    return 1
  fi
}