bash :: functie bash pentru generarea unui sir de caractere random

Functie bash care genereaza un sir random de caractere, de lungimea dorita.

Primeste doi parametri:
- lungimea dorita a sirului de caractere (implicit 32)
- tipul de caractere (0 foloseste numai alfanumerice pentru generare, 1 foloseste alfanumerice si semne)

function GenerateRandomString() {

    # Function to generate a random string
    #
    # Param:
    #   - number of characters, defaults to 32
    #   - 0 if only chars and numbers, 1 if it should include signs
    #
    # Return:
    #   - Generated string
    #
    # Copyright CAMSCAPE SERVICES GPLv2
    # http://www.camscape.ro
    #

    if [ "$2" == "0" ]; then
        CHAR="abcdefghijklmnopqrstuvxywzABCDEFGHIJKLMNOPQRSTUVXYWZ0123456789"
    else
        CHAR="abcdefghijklmnopqrstuvxywzABCDEFGHIJKLMNOPQRSTUVXYWZ0123456789!@#$%^&*(\\)\_\+\-\=\[\]\{\}\;\'\\\:\"\,\.\/\<\>\?\|\`\~"
    fi

    cat /dev/urandom | tr -cd "$CHAR" | head -c ${1:-32}
    echo

}