BASH : Comparison of values

is equal to
if [ "$a" -eq "$b" ]
if [ "$a" -eq "35" ]

not equal to
if [ "$a" -ne "$b" ]

is greater than
if ["$a" -gt "$b" ]

is greater or equal than
if [ "$a" -ge "$b" ]

is lower than
if [ "$a" -lt "$b" ]

is lower or equal than
if [ "$a" -le "$b" ]