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Ano, ma to byt tak, ako vravite, lebo inak to nerobi dobrotu, ak je v nazve interpreteru - (alebo vseobecne textu porovnavajuceho sa oproti regexp-u) a je to aj v dokumentacii "prekvapujuco". Ciarky tam nemaju co robit taktiez, aj ked prekvapujuco sa to zachovalo podla ocakavania v priebehu testu na skriptoch v /usr/bin/* . No v dnesnych testoch na viac bizarnejsie nazvy s - . _ , to uz nepreslo ... Takze dakujem za opravu, pomlcka VZDY prva a ziadne ciarky a zaroven prikladam opraveny skript :

#!/bin/bash
 
SearchPath()
{
declare dir
declare -r oldifs="$IFS"
IFS=':'
 
for dir in $PATH
do
        [ -x "$dir"/"$1" ] && interpreter="$dir"/"$1" && IFS="$oldifs" && return 0
done
IFS="$oldifs"
return 1
}
 
FindInterpreter()
{
declare interpreter script_path
script_path="$1"
# this way it reads the very first line of chosen script only
read first_line <"$script_path"
 
# the very first with the very first two characters #! , folowing or not by space
# and a path to an interpreter.Allowed characters are letters, numbers, underscore,
# dot and hyphen.
if [[ "$first_line" =~ ^#![[:space:]]*(/[-_./a-Z0-9]*)[[:space:]]*([-_.a-Z0-9]*) ]]
then
        if [ "${BASH_REMATCH[1]}" == '/usr/bin/env' ]
        then
                interpreter="${BASH_REMATCH[2]}"
                if SearchPath "$interpreter"
                then
                        echo -e "Skript: $script_path\nInterpreter: "$(readlink -f "$interpreter")""
                else
                        echo -e "Skript: $script_path\nInterpreter: $interpreter sa nenachadza v ziadnej z ciest v PATH.\nJe nainstalovany?"
                fi
        else
                interpreter="${BASH_REMATCH[1]}"
                echo -e "Skript: $script_path\nInterpreter: "$(readlink -f "$interpreter")""
        fi
else
        echo -e "Chybajuci shebang.\nSi si isty, ze $script_path je skript ?"
        return 1
fi
}
 
FindInterpreter "$1"