* at linux command line

Question

I am making a small calculator in C, and I want to pass simple arithmetic formulas to my program. But I really don't like it when I pass the '*' character to my program. Why not? And how can I get around this without changing the asterisk to something else? Thanks

Answer 1

A symbol *is a shell trigger for extending matching file names.

There are several ways to handle this:

• Enter Escape mycalc 5 \* 3
• Put the whole expression in quotation marks and make sure that the calculator parser works like this: myprog "5 * 3"
• Do not use the command line: use your own input instead.

Answer 2

* , ( "globbing" ). * .

Answer 3

* globbing , . * ,

./yourprogram '10 * 10'

./yourprogram 10 '*' 10

, argv [1] "10 * 10",

Answer 4

Linux (bash, tcsh, ksh, whatever) '*' , . - "x". .

Answer 5

. , . , , :

# For bash
set -o noglob

# For csh/tcsh
set noglob

# Now that noglob is set, you can safely use *
calc 3 * 3

Answer 6

* " " bash. , . - , .

Answer 7

"calc", deb- apt-get install calc, 3 * 3, 3 * 3

Answer 8

, C

* \*