[SOLVED] About positional parameters

sleftar · 11-05-2015, 03:26 PM

Hi guys,

I know few tricks about positional parameters..

For example

Code:

set Joshua is my name.
echo $@
echo "$3 $4"

first one prints everything and second will print the part "my name."

Is there any way to write the second echo except this one.. For example I want all positional parameters to be printed except first 2.

I mean what I want to write is instead of writing this

Quote:

echo "$3 $4"

Is there any way to write it as for example

Quote:

echo "$@-($1+$2)"

because I want user to enter that sentence for me and I dont want my program to take first 2 positional parameters but I want computer to take rest of all parameters... Thanks.

berndbausch · 11-05-2015, 06:08 PM

You just use "shift 2" to get rid of the first two parameters.

Reference

sleftar · 11-06-2015, 02:12 AM

Oh man many thanks :E

grail · 11-06-2015, 03:20 AM

Or maybe remember that '@' is essentially an array:

Code:

echo ${@:3}

sleftar · 11-06-2015, 05:08 AM

Quote:

Originally Posted by grail

Or maybe remember that '@' is essentially an array:

Code:

echo ${@:3}

what does echo ${@:3} exactly mean?

sleftar · 11-06-2015, 05:51 AM

Quote:

Originally Posted by grail

Or maybe remember that '@' is essentially an array:

Code:

echo ${@:3}

nvm I got it.. Similar thing but this time does not really change $@ itself. Takes whole parameters starting from 3rd element of the array.. This one would be more useful since you may also want to keep first 2 elements of the array to use somewhere else although I dont need first 2 elements for my example I took this to my notes since I can use at some point.Thanks .