Author Archives: cowman.chiang

[Python] Produces a circular image of 001-100

Posted on 2024 年 08 月 07 日 by cowman.chiang

import matplotlib.pyplot as plt import numpy as np def draw_circle_with_number(number, filename): fig, ax = plt.subplots(figsize=(5, 5)) ax.set_xlim(0, 1) ax.set_ylim(0, 1) # draw circular circle = plt.Circle((0.5, 0.5), 0.4, color=’blue’, fill=False, linewidth=4) ax.add_artist(circle) # add text ax.text(0.5, 0.5, f'{number:03}’, color=’black’, fontsize=90, … Continue reading →

Posted in Python | Comments Off on [Python] Produces a circular image of 001-100

[Postman] Upload file to s3 in pre-request script

Posted on 2024 年 08 月 07 日 by cowman.chiang

First, select binary in the body settings, and assign a file at will. Then the real file path will be obtained through the syntax in pre-script. In some cases, you may need to set the file directory to Postman’s working … Continue reading →

Posted in Postman | Comments Off on [Postman] Upload file to s3 in pre-request script

CSS: Center text (horizontally and vertically)

Posted on 2024 年 01 月 29 日 by cowman.chiang

404 Error Page 404 此活動不存在 Ref.: iThome: 29. CSS 水平置中/ 垂直置中的方法

Posted in CSS, HTML | Comments Off on CSS: Center text (horizontally and vertically)

Mac OS X upgrade cURL with SSL support

Posted on 2023 年 11 月 16 日 by cowman.chiang

┌─Cowman@CLOUD-42:~/Downloads/20160511 └──$ sh curl.sh guList curl: (1) Protocol “‘https” not supported or disabled in libcurl ┌─Cowman@CLOUD-42:~/Downloads/20160511 └──$ brew install curl –with-nghttp2 ==> Installing dependencies for curl: openssl, pkg-config, libev, libevent, jansson, boost, libxml2, spdylay, nghttp2 ….

Posted in Mac | Leave a comment

Delete snapshots older than 7 days

Posted on 2023 年 11 月 16 日 by cowman.chiang

To avoid running out of disk space in our test environment, we developed a plan to regularly execute shell scripts to clean up unnecessary snapshots. #!/bin/bash week=`date –date=’7 days ago’ +’%Y%m%d’` echo “list_snapshots” | /home/webuser/hbase-1.2.9/bin/hbase shell | grep “pattern ” … Continue reading →

Posted in HBase, Shell Script | Comments Off on Delete snapshots older than 7 days

Continuously print the file content

Posted on 2023 年 10 月 25 日 by cowman.chiang

Use the command ‘tail’ to print the file contents, starting from the beginning of the file and print new contents continuously. tail +1f ‘file’

Posted in Linux | Comments Off on Continuously print the file content

HBase Client 2.5.5 in JDK 11

Posted on 2023 年 10 月 02 日 by cowman.chiang

Because of the vulnerability scan results of the project, the JDK version must be upgraded from 8 to 11 to complete the repair. The original HBase Client version 1.2 we used was incompatible with JDK 11, so we had to … Continue reading →

Posted in HBase, Java | Comments Off on HBase Client 2.5.5 in JDK 11

AES decrypt in postman

Posted on 2023 年 05 月 31 日 by cowman.chiang

sample code: var CryptoJS = require(“crypto-js”); let secretKey = ‘yourSecretKey’; function decrypt(aesStr, key) { return CryptoJS.AES.decrypt( aesStr, CryptoJS.enc.Utf8.parse(padding(key)), { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 } ).toString(CryptoJS.enc.Utf8) } function padding(key) { return key.padEnd(32, ‘\0’); } //decrypt(“encryptedData”, secretKey) Here we choose AES-256 to … Continue reading →

Posted in JavaScript, Postman | Comments Off on AES decrypt in postman

[Java] Create CSV files with BOM

Posted on 2023 年 03 月 10 日 by cowman.chiang

public static final String UTF8_BOM = “\uFEFF”; public ByteArrayInputStream createFile(Object object) { try { CSV csv = (CSV) object; StringBuffer sb = new StringBuffer(); sb.append(UTF8_BOM); if (csv.getHeaderList() != null) { sb.append(StringUtils.join(csv.getHeaderList().toArray(new String[0]), “,”)).append(“\n”); } for (List<String> row : csv.getDataList()) { … Continue reading →

Posted in Java | Comments Off on [Java] Create CSV files with BOM

[Linux] pkill command

Posted on 2023 年 02 月 23 日 by cowman.chiang

I don’t know what’s going on. But we can use command “pkill” to delete those abnormal processes. sudo pkill -f pgrep Reference: stackoverflow: How to kill all processes with a given partial name?

Posted in Linux | Comments Off on [Linux] pkill command