No Linux, os arquivos são gravados permanentemente somente após a desmontagem da partição. Isso pode explicar por que muitas ferramentas gráficas oferecem desempenho insatisfatório ao gravar arquivos em unidades flash USB. Para resolver esse problema, desenvolvi um script compacto que, até agora, tem funcionado de maneira eficaz.

Observação: não consegui fazer com que o recurso status=progress funcionasse corretamente. No entanto, o script copia com êxito os arquivos transferidos para a unidade flash USB. Depois de realizar vários testes, nenhum erro foi encontrado.

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Esconder código-fonte

#!/bin/bash

declare -r MOUNT_POINT="/media/flashdrive"

# Function to check for required commands
check_dependencies() {
    local dependencies=(lsblk mkdir mount umount dd cp du grep diff)
    for cmd in "${dependencies[@]}"; do
        if ! command -v "$cmd" &> /dev/null; then
            echo "Error: Required command '$cmd' is not installed." >&2
            exit 1
        fi
    done
}

# Function to check if device is mounted and unmount it
safe_unmount() {
    local device="$1"
    if mount | grep -qw "$device"; then
        echo "$device is currently mounted, attempting to unmount..."
        sudo umount "$device" && echo "$device unmounted successfully." || { echo "Failed to unmount $device."; return 1; }
    fi
}

# Function to mount drive
ensure_mounted() {
    local device="$1"
    if ! mount | grep -q "$MOUNT_POINT"; then
        echo "Mounting $device..."
        sudo mkdir -p "$MOUNT_POINT"
        sudo mount "$device" "$MOUNT_POINT" || { echo "Failed to mount $device."; exit 1; }
    else
        echo "Device is already mounted on $MOUNT_POINT."
    fi
}

# Function to copy files or directories safely
copy_files() {
    local source="$1"
    local destination="$2"
    local dest_path="$destination/$(basename "$source")"

    if [[ -d "$source" ]]; then
        echo "Copying directory $source to $destination using 'cp -r'..."
        sudo cp -r "$source" "$dest_path" && echo "$source has been copied."
    else
        echo "Copying file $source to $destination using 'dd'..."
        sudo dd if="$source" of="$dest_path" bs=4M status=progress && echo "$source has been copied."
    fi
    
    echo "Wait finishing changes..."  
    sudo mount -o remount,sync "$MOUNT_POINT"

    # Verify copy integrity
    du -b "$source" "$dest_path"
    if sudo diff -qr "$source" "$dest_path"; then
        echo "Verification successful: No differences found."
    else
        echo "Verification failed: Differences found!"
        return 1
    fi
}

# Function to format the drive
format_drive() {
    local device="$1"
    echo "Checking if device $device is mounted..."
    safe_unmount "$device" || return 1
    echo "Formatting $device..."
    sudo mkfs.exfat "$device" && echo "Drive formatted successfully." || echo "Formatting failed."
}

# Function to display usage information
help() {
    echo "Usage: $0 OPTION [ARGUMENTS]"
    echo
    echo "Options:"
    echo "  -c, -C DEVICE SOURCE_PATH    Mount DEVICE and copy SOURCE_PATH to it."
    echo "  -l, -L                       List information about block devices."
    echo "  -f, -F DEVICE                Format DEVICE."
    echo
    echo "Examples:"
    echo "  $0 -C /dev/sdx /path/to/data  # Copy /path/to/data to /dev/sdx after mounting it."
    echo "  $0 -L                        # List all block devices."
    echo "  $0 -F /dev/sdx               # Format /dev/sdx."
}

# Process command-line arguments
case "$1" in
    -C | -c)
        check_dependencies
        ensure_mounted "$3"
        copy_files "$2" "$MOUNT_POINT"
        echo "Unmounting $MOUNT_POINT"
   sudo umount "$MOUNT_POINT"
        ;;
    -L | -l) lsblk -o NAME,MODEL,SERIAL,VENDOR,TRAN
   ;;
    -F | -f)
        check_dependencies
        format_drive "$2"
        ;;   
    *)
   help
        ;;
esac

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