Java: check if a String contains only ASCII

import java.nio.charset.Charset;

public boolean isAscii(String v) {
    Charset.forName("US-ASCII").newEncoder().canEncode(v);
}

Eclipse: Disable auto escaping when pasting

 

1. In the preferences menu deselect: Java > Editor > Typing > Escape text when pasting into a string literal
2. Disable smart insert mode: Edit > Smart Insert Mode [Ctrl+Shift+Insert]

Shell scripts to count files and sum up file sizes

	#!/bin/sh
	[ $# -ne 1 ] && echo "$(basename $0) <dir>" && exit 1
	[ ! -d $1 ] && echo "$1 is not a directory." && exit 1
	find "$1" -type f | wc -l

view raw count-files-in-dir.sh hosted with ❤ by GitHub

	#!/bin/sh
	[ $# -ne 1 ] && echo "$(basename $0) <dir>" && exit 1
	[ ! -d $1 ] && echo "$1 is not a directory." && exit 1
	if [ $(uname) == "Darwin" ]; then
	find "$1" -type f -print0 | xargs -0 stat -f '%z ' | paste -sd+ - | bc
	else
	find "$1" -type f -printf %s\\n | paste -sd+ | bc
	fi

view raw sum-file-size-in-dir.sh hosted with ❤ by GitHub

Fix Windows 10 Update KB5034441 Error 0x80070643

The reason KB5034441 failed to install with error 0x80070643 is that there is not sufficient space in WinRE recovery partition. The solution is:

Manually resize your WinRE recovery partition by 250 MB

1. Open a Command Prompt window (cmd) as Administrator.
2. Check WindowsRE status:

   reagentc /info

   
   If the WinRE is installed, there should be a “Windows RE location” with a path to the WinRE directory. An example is, “Windows RE location: [file://%3f/GLOBALROOT/device/harddisk0/partition4/Recovery/WindowsRE]\\?\GLOBALROOT\device\harddisk0\partition4\Recovery\WindowsRE.” Here, the number after “harddisk” and “partition” is the index of the disk and partition WinRE is on.
3. Disable the WindowsRE:

   reagentc /disable

4. Shrink the OS partition and prepare the disk for a new recovery partition.
   • Run

     diskpart

   • Run

     list disk

   • Select the OS disk (This should be the same disk index as WinRE.), run

     sel disk OS_DISK_INDEX

     e.g.

     sel disk 0

     if disk 0 is the OS disk.
   • Find the OS Primary partition, run

     list part

   • Select the OS Primary partition, run

     sel part OS_PARTITION_INDEX

   • Shrink the OS Primary partition by 250MB, run

     shrink desired=250 minimum=250

5. Delete the WinRE recovery partition
   • In diskpart, select WinRE partition, run

     sel part WinRE_PARTITION_INDEX

   • Delete the WinRE partition, run

     delete partition override

6. Create a new WinRE recovery partition.
   • First, check if the disk partition style is a GUID Partition Table (GPT) or a Master Boot Record (MBR). To do that, run

     list disk

     . Check if there is an asterisk character (*) in the “Gpt” column. If there is an asterisk character (*), then the drive is GPT. Otherwise, the drive is MBR.
   • If your disk is GPT, run

     create partition primary id=de94bba4-06d1-4d40-a16a-bfd50179d6ac

     followed by the command

     gpt attributes =0x8000000000000001

   • If your disk is MBR, run

     create partition primary id=27

7. Format the new WinRE recovery partition, run

   format quick fs=ntfs label="Windows RE tools"

   
   To confirm that the WinRE partition is created, run

   list vol

   
   Exit from diskpart, run

   exit

8. Re-enable WinRE, run

   reagentc /enable

   
   To confirm where WinRE is installed, run

   reagentc /info

Now you should be able to install KB5034441 via Windows Update

See also

• The January 2024 Windows RE update might fail to install
• Script to Extend the Windows RE Partition
• KB5028997: Instructions to manually resize your partition to install the WinRE update
• A Youtube video shows how to this 0x80070643 error

Compress sparse files preserving their holes

use -S option for tar

tar -Sczvf sparse_file.tar.gz sparse_file