Ubuntu Unleashed 2019 Edition: Covering 18.04, 18.10, 19.04

set number2=10

set number3=5

if      (number1    >   number2)        then

            echo    "number1    is  greater than    number2"

else

            echo    "number1    is  not greater than    number2"

endif

if      (number1    >=  number3)    then

            echo    "number1    is  greater than    or  equal   to  number3"

else

            echo    ""number1   is  not greater than    or  equal   to  number3"

endif

if      (number1    <   number2)        then

            echo    ""number1   is  less    than    number2"

else

            echo    ""number1   is  not less    than    number2"

endif

if      (number1    <=  number3)    then

            echo    ""number1   is  less    than    or  equal   to  number3"

else

            echo    ""number1   is  not less    than    or  equal   to  number3"

endif

When executing the shell program compare2, you get the following results:

Click here to view code image
number1 is not greater than number2
number1 is greater than or equal to number3
number1 is less than number2
number1 is less than or equal to number3

File Operators

You can use the following operators as file comparison operators:

-d—Determines   whether a   file    is  a   directory

-e—Determines   whether a   file    exists

-f—Determines   whether a   file    is  a   regular file

-o—Determines   whether a   user    is  the owner   of  a   file

-r—Determines   whether read    permission  is  set for a   file

-w—Determines   whether write   permission  is  set for a   file