#! /bin/sed -f

/../ {

    # Reverse a line.  Begin embedding the line between two new-lines
    s/^.*$/\
&\
/

    # Swap first and last character.  The regexp matches until
    # there are zero or one characters between the markers
    t x
    :x
    s/\(\n.\)\(.*\)\(.\n\)/\3\2\1/
    t x

    # Remove the new-line
    s/\n//g
}  

### colorized by sedsed, a SED script debugger/indenter/tokenizer/HTMLizer
### original script: http://sed.sf.net/grabbag/scripts/revchr_2.sed