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Hey can anyone tell me the korn script code to implement an interactive integer calculator using the shell's built in arithemetic expression evaluation

Whenever we have a \" we need to replace it with a ",if s[j]=='\\' and s[j+1]=='n' then replace it by='\n'..
Character Escape Sequence
" \"
' \'
? \?
\ ...

hey
i wanted to know if there is some single unix command to replace all the character escape sequences with their "C" values in a string...
The only way i know is repetatively kepp using the grep...

hey..
i had a problem with the unix command when i want to remove the white spaces in a string..i guess i cud do it with a sed command but i get an error when i give space in the square brackets.....