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[ $var -eq 0 ]  # Returns true when $var equals 0
[ $var -ne 0 ]  # Returns true when $var is not equal to 0

[$var -eq 0 ]  or [ $var -ne 0]

[ $var1 -ne 0 -a $var2 -gt 2 ]  # Using logical and -a
[ $var1 -ne 0 -o $var2 -gt 2 ]  # Using logical or -o

fpath="/etc/passwd"
if [ -e $fpath ]; then
  echo File exists;
else
  echo Does not exist;
fi

[[ $str1 = $str2 ]]

str1="Not empty"
str2=""
if [[ -n $str1 ]] && [[ -z $str2 ]];
then
  echo str1 is nonempty and str2 is an empty string.
fi

if [ $var -eq 0 ]; then echo "True"; fi