alexander@goblin-book /tmp $ cat ~/sh/chardetect.sh
#!/bin/bash
CHARSETS="IBM437 IBM866 CP1251 CP1252 ISO8859-1 ISO8859-5 ASCII UTF8"

while read STR; do
        for cp1 in $CHARSETS; do
                for cp2 in $CHARSETS; do
                        [ "$cp1" == "$cp2" ] && continue;

                        STR2="$(echo "$STR" | iconv -t $cp1 -f $cp2 2>/dev/null)"
                        if [ $? -eq 0 ]; then
                                printf "%9s - %9s : " $cp1 $cp2 
                                echo -E "$STR2"
                        fi
                done
        done
done
alexander@goblin-book /tmp $ echo 'ПК' | ~/sh/chardetect.sh | ~/sh/chardetect.sh | grep -i 'ÅÈ'
     UTF8 -    IBM437 : IBM866 -      UTF8 : Åè