aruku7230

// reference: https://stackoverflow.com/a/16155417/4910876
// http://2ality.com/2012/02/js-integers.html

function IntegerToBin(dec){
  let result = (dec >>> 0).toString(2);
  while(result.length < 32) {
    result = "0" + result;
  }
  return result;
}

aruku7230

#!/usr/bin/env python

import sys
import tempfile

def convertToUtf8Encoded(sourceFileName, sourceEncoding = 'shift-jis'):
    BLOCKSIZE = 1048576 # 1 MB. Unit is Byte.

    with tempfile.TemporaryFile("w+t") as tempFile:
        readSucceeded = False

aruku7230

Problem

Given four numbers n1, n2, n3, n4, return whether they can be calculated to be 24 by using only four basic arithmetic operations (addition, subtraction, multiplication, division). See also https://en.wikipedia.org/wiki/24_(puzzle).

Example 1:

• Input: n1: 6, n2: 8, n3: 2, n4: 4
• Output: true
• Explanation: (6*2)+8+4 = 24

aruku7230

Problem

Given a CSV template file, generate a new CSV file based on the template rule.

Example 1:

• Template CSV file:

  first_name,last_name,full_name
  Richard,Hendricks,{first_name} {last_name}
  

Bertram,Gilfoyle,{first_name} {last_name}

aruku7230

#!/usr/bin/env bash

log_file=rsync.log
rm $log_file
dest=/dest/folder/

# Uhe trailing slash of source folder indicate the content to be copied.
# Without trailing slash, the folder itself will copied to destination folder.
rsync -av --delete --exclude=.DS_Store /source/folder/ $dest >> $log_file 2>&1

aruku7230

#! /usr/bin/env bash

# The -e setting shall be ignored when executing any command of an AND-OR list other than the last.

# The following code is tested on GNU bash, version 5.0.17(1)-release (x86_64-pc-linux-gnu)

set -e
false && true
# the following line will print
echo $? # 1

aruku7230

# Example: Convert `レポート.pdf` to `レポート.pdf`
# Dry run. Use --notest to finally rename the files.
convmv -f utf8 -t utf8 --nfc -r test

aruku7230

compare two folder: diff -qr /path/to/folder1 /path/to/folder2

calculate TOTP: oathtool --totp -b -d 6 <secret-string>

copy folder with mode and timestamps preserverd (owership may be changed):

# folder1 will be copied to /path/to/folder2/folder1
#
# temporarily bypass an alias and use the non-aliased version of a command by prefixing it with \.
# If not prefix with backslash, cp may ask for confirmation before overwrite a file,

aruku7230

#! /usr/bin/env bash

# See https://stackoverflow.com/a/35977842/4910876

# Retries a command on failure.
# Sleep some seconds between each try, and increase the interval.
# Arguments:
#   $1: the max number of attempts
#   $2...: the command to run

aruku7230

Use apksigner

apksigner verify --print-certs --verbose <name>.apk

Check checksums

Check checksums: sha256sum --check <name>.asc, change sha256sum to corresponding tool is checksums algorithm is not SHA256.