Subtrating strings ... (abcd) - (abc) = d ...

I have two strings

string 1="abcd"
string 2="abc"

I want subtraction of two strings = "d"



Another example

string 1="computers"
string 2="comp"

I want subtraction of two strings = "uters"

Re: Subtrating strings ... (abcd) - (abc) = d ...

rohitsagar@yahoo.com wrote:
> string 1="abcd"
> string 2="abc"

What should be the result of
"abcd" - "dcba"

What should be the result of completely disjoint strings
"abcd" - "wxyz"

What should be the result of
"abcabcabc" - "abc"

--
Daniel

Re: Subtrating strings ... (abcd) - (abc) = d ...

On 2007-10-03, rohitsagar@yahoo.com wrote:
> I have two strings
>
> string 1="abcd"
> string 2="abc"
>
> I want subtraction of two strings = "d"
>
> Another example
>
> string 1="computers"
> string 2="comp"
>
> I want subtraction of two strings = "uters"

In bash or ksh93:

string1=abcd
string2=abc
string3=${string1/"$string2"/}

Otherwise:

printf "%s\n" "$string1" | sed "s/$string2//"

If $string2 contains slashes, they must be escaped, or use a
different sed delimiter.

--
Chris F.A. Johnson, author
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence

Re: Subtrating strings ... (abcd) - (abc) = d ...

rohitsagar wrote:
> I have two strings
>
> string 1="abcd"
> string 2="abc"
>
> I want subtraction of two strings = "d"
>
>
>
> Another example
>
> string 1="computers"
> string 2="comp"
>
> I want subtraction of two strings = "uters"

[...]

$ s1="computers"
$ s2="comp"
$ printf "%s\n" "${s1#$s2}"
uters


Dimitre