컴퓨터 프로그래밍 컴퓨터 프로그래밍

- 배포판 버전 확인 $ grep . /etc/*-release - 디스크 용량 확인 하기 $ du -h - Centos 7에 PostgreSQL 11 버전 설치 c.f. # yum install -y postgresql # rpm -Uvh https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm # yum install -y postgresql11-server postgresql11-contrib # /usr/pgsql-11/bin/postgresql-11-setup initdb # systemctl start postgresql-11 # systemctl enable postg..

SELECT LPAD(' ', 3 * LEVEL - 3) || ename NAME, LEVEL, empno, mgr FROM emp START WITH ename = 'KING' CONNECT BY PRIOR empno = mgr;

${user.home}/.m2/repository local repository ${basedir}/pom.xml project's Project Object Model, or POM ${basedir}/src/main/java/ # / project source code directory ${basedir}/src/main/resources/(META-INF/application.properties) # /META-INF/application.properties ${basedir}/src/test/java/ test source code directory ${basedir}/src/test/resources/(test.properties) # /(test.properties) plugin - goal ..

CentOS-7-x86_64-Minimal-xxxx.iso 파일을 다운받아 "Win32 Disk Imager" 툴로 USB를 만든다 c.f. "Universal USB installer"로 만들면 안 됨 네트워크를 설정 /etc/sysconfig/network-scripts/ifcfg-xxxx c.f. $ service network start 시스템 종료 # shutdown -h now 시스템 재부팅 # shutdown -r now 절전모드 # systemctl suspend 최대 절전모드 # systemctl hibernate $ cat /etc/redhat-release 디스크 정보 $ df (-h) wget 설치 # yum install wget # yum install unzip # yum in..

standard services to determine the type of an arbitrary piece of data, encapsulate access to it, discover the operations available on it, and to instantiate the appropriate bean to perform said operation(s) 참조 사이트: https://www.oracle.com/technetwork/java/jaf11-139815.html

a platform-independent and protocol-independent framework to build mail and messaging applications available as an optional package for use with the Java SE platform and is also included in the Java EE platform 참조 사이트: https://javaee.github.io/javamail/

* J2SE 1.4 ConstructMatches CharactersxThe character x\\The backslash character\0nThe character with octal value 0n (0

import win32com.clientexcel = win32com.client.Dispatch("Excel.Application")excel.Visible = Truewb = excel.Workbooks.Add()ws = wb.Worksheets("Sheet1")ws.Cells(1, 1).Value = "..."wb.SaveAs('...')excel.Quit() import win32com.clientexcel = win32com.client.Dispatch("Excel.Application")excel.Visible = Truewb = excel.Workbooks.Open('...')ws = wb.ActiveSheet... ws.Cells(1, 1).Value ...excel.Quit() 참조 사이..