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You could use bc. E.g.,

$ echo "25 + 5" | bc
30

Alternatively bc <<< 25+5 will also work.

Or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

bc -q will jump into bc right away without the header/copyright info. For more information see the bc man page

You could use bc. E.g.,

$ echo "25 + 5" | bc
30

Alternatively bc <<< 25+5 will also work.

Or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

The GNU implementation of bc prints that header/copyright info on start-up when both its stdin and stdout go to a terminal. You can suppress it with the (GNU-specific) -q option. For more information see the bc man page

You could use bc. E.g.,

$ echo "25 + 5" | bc
30

Alternatively bc <<< 25+5 will also work.

Or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

bc -q will jump into bc right away without the header/copyright info. For more information see the bc man page

This page also shows how to set up an alias or function to do calculation like this:

c "25 + 5" 

and get the result

You could use bc. E.g.,

$ echo "25 + 5" | bc
30

Alternatively bc <<< 25+5 will also work.

Or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

bc -q will jump into bc right away without the header/copyright info. For more information see the bc man page

You could use bc. E.g.,

$ echo "25 + 5" | bc
30

or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

bc man page

This page also shows how to set up an alias or function to do calculation like this:

c "25 + 5" 

and get the result

You could use bc. E.g.,

$ echo "25 + 5" | bc
30

Alternatively bc <<< 25+5 will also work.

Or interactively, if you want to do more than just a single simple calculation:

$ bc
bc 1.06.95
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'. 
25 + 5
30

bc -q will jump into bc right away without the header/copyright info. For more information see the bc man page

This page also shows how to set up an alias or function to do calculation like this:

c "25 + 5" 

and get the result