how does this substition work?

[wrapster]

Hi all,
Would like to know how this substitution works?

Would like to know how these substitution works??

Code:

FINISHED="Done"
x=126
COLS=$((${x} -${#FINISHED} - 5))

here does the #FINISHED give the ascii value of "done" ,or how does it work?

Thanks

[khafa]

hi



here is how it works.
1) first bash calculates ${#FINISHED} and that yields 4 ( ${#FINISHED} is the length of the variable FINISHED which contains 4 characters( "Done")) .
2) then it calculates 126 - 4 - 5 = 117
3) then it puts it in COLS