Scripts demonstrating the differences between string and integer comparisons

#!/bin/bash
# this script is a good starting place to start playing around w/ the differences

a="a b c"
if [ "$a" == "a b c" ]
then
  echo equal
else
  echo not equal
fi

if [ "$a" == "a b" ]
then
  echo equal
else
  echo not equal
fi

a="1"
b="2"
if [ $a -eq $b ]
then
  echo equal
else
  echo not equal
fi

if [ $a -ne $b ] && [ "$a" != "$b" ]
then
  echo Not equal, either as strings or ints
fi

File test operators

#!/bin/bash
# test properties of a file
file="testfile"
if [ -e $file ]
then
  echo file exists
else
  echo file does not exist
fi

if [ -x $file ]
then
  echo file is executable
fi

if [ -w $file ]
then
  echo file is writeable
fi

if [ -r $file ]
then
  echo file is readable
fi