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尝试让 printf 语句在 bash for 循环中执行一次

tag-icon • tag-icon bash shell-script shell
尝试让 printf 语句在 bash for 循环中执行一次

我想知道我将如何去做

printf "Credentials found!"

当找到多个凭据时仅一次。

截屏

Attempting Dictionary Attack on 192.168.91.130

Credentials Found!

Log into the telnet server by running telnet -l admin 192.168.91.130

When prompted enter the password found 'admin'

Credentials Found!

Log into the telnet server by running telnet -l sfx 192.168.91.130

When prompted enter the password found 'toor'

循环bash：

for i in "${!user[@]}"; do
    printf "The Username & Password is %s : %s\n\n" "${user[i]}" "${pass[i]}" >> SSH-Credentials.txt

    printf "${NCB}Credentials Found!${NC}\n\n"

    printf "Log into the SSH server by running ${YELLOW}ssh ${user[i]}@$ip${NC}\n\nWhen prompted enter the password found ${YELLOW}'${pass[i]}'\n"
    printf "${NC}\n"
done

答案1

$i您可以进行如下测试：

    [[ "$i" -lt 1 ]] && printf "I am only printed once\n"

    # OR
    (( i < 1 )) && printf "I am only printed once\n"

    # OR
    ! (( i )) && printf "I am only printed once\n"

    # OR
    [ "$i" -lt 1 ] && printf "I am only printed once\n"

    # OR
    if [[ "$i" -lt 1 ]]; then
        printf "I am only printed once\n"
    fi

假设你不使用关联 bash 数组。

简而言之：如果索引小于 1，则打印。

为了便于阅读，我也会分解这些行。路宽。请注意，您还可以说：

printf '%s %s some long text' \
"$var1" "$var2"

使用大写字母表示变量也是一个坏习惯。

信息通常还应打印在stderr， 所以>&2。

还会使用：

prinf '%s@%s' "${user[i]}" "$ip" >&2

代替：

prinf "${user[i]}@$ip" >&2

答案2

user如果数组中有元素，则输出标头。

if [[ ${#user[@]} -gt 0 ]]; then
    printf '%sCredentials Found!%s\n\n' "$NCB" "$NC"
fi

然后做你的循环。

for i in "${!user[@]}"; do
    printf 'The Username & Password is %s : %s\n\n' "${user[i]}" "${pass[i]}" >> SSH-Credentials.txt

    cat <<END_MESSAGE
Log into the SSH server using ${YELLOW}ssh ${user[i]}@$ip$NC
When prompted, enter the password found: ${YELLOW}${pass[i]}$NC

END_MESSAGE
done

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