Create grids to print graph paper

printgraph.sh

#!/bin/bash

COLS=`tput cols`
ROWS=$[`tput lines`-1]

function printgraph() {
  if [ $TYPE == hex ]; then
    COUNT1=$[COLS/4]
    COUNT2=$[ROWS/2]
  else
    COUNT1=$[COLS/2]
    COUNT2=$ROWS
  fi

  j=0
  while [ $j -lt $COUNT1 ]; do
    if [ $TYPE == hex ]; then
      echo -n '  _ '
    else
      echo -n ' _'
    fi
    j=$[j+1]
  done
  echo

  i=0
  j=0

  while [ $i -lt $COUNT2 ]; do
    while [ $j -lt $COUNT1 ]; do
      if [ $TYPE == hex ]; then
        echo -n '_/ \'
      else
        echo -n '|_'
      fi
      j=$[j+1]
    done
    echo
    j=0
    while [ $j -lt $COUNT1 ]; do
      if [ $TYPE == hex ]; then
        echo -n ' \_/'
      fi
      j=$[j+1]
    done
    if [ $TYPE == hex ]; then
      echo
    fi
    j=0
    i=$[i+1]
  done
}

if [ $# -ne 1 ]; then
  echo "Usage: $0 <hex|square>"
  echo
  exit 1
fi

case $1 in
  "hex")
    TYPE=hex
    printgraph
    ;;
  "square")
    TYPE=square
    printgraph
    ;;
  *)
    echo "ERROR: I don't know how to $1"
    echo
    exit 1
    ;;
esac

I had a program that would do this on the Apple //. Apparently, I felt this was missing from my life.

$ printgraph.sh
Usage: printgraph.sh <hex|square>

$ printgraph.sh hex
  _   _   _   _   _   _   _   _   _   _   _   _   _   _   _   _   _   _   _ 
_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \
 \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \
 \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \
 \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/ \_/
etc.

$ printgraph.sh square
 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_
|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_
|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_|_
etc.