Linux Shells

for i in {1..10}; do echo $i;done

# admin@~/ws/shell$cat weight-check.sh
#!/bin/bash

# Author: Bruce

#if [ ! $# -eq 2 ]; then
if [ $# -lt 2 ]; then
  echo "Not enough parameters. Usage: $0 weight-in-kilos lengh-in-centimeters"
  exit
elif [ $# -gt 2 ]; then
  echo "Too many parameters. Usage: $0 weight-in-kilos lengh-in-centimeters"
  exit
else
  # "" -> true; " " -> false
  if [ -z "$1" ]; then
    echo "1st parameter empty"
    exit
  fi
  if [ -n "$2" ]; then
    echo "2nd parameter not empty"
  fi

  echo -n "You entered: "
  for p in "$1" "$2";do
    echo -n "$p "
  done
  echo ""
fi

if [ -f lock ]; then
  echo "Already run"
fi

# Adding lock if not yet
echo "lock" > lock

weight="$1"
height="$2"

ideal=$[height - 110]

if [ $weight -gt $ideal ]; then
  echo "Less yummy food please"
elif [ $weight -eq $ideal ]; then
  echo "Goodness, you are perfect!"
else
  echo "More food please"
fi

rm -f lock