manager – Page 3

Check Sendmail version

2020-04-242020-04-24

1. Intro Show Sendmail version 2. Command sendmail -d0.1 < /dev/null | grep -i version

1. Intro If cron does not run with the following error 2. Cause Account password expired. 3. Solution Modify Account’s password max days 3.1. Check default Policy grep “PASS_MAX_DAYS” /etc/login.defs 3.2. Change account Policy chage -E -1 -M 99999 [username] grep “[username]” /etc/shadow

Linux 공통

split file

2020-02-152020-03-04

1. Intro split a file into pieces 2. Command 2.1. split by byte split -b [10m / 10k] [file name] 2.2. split by line split -l [line number] [file name]

Python

check python ssl version

2020-02-092020-03-06

1. Intro check python cryptography, ssl version 2. command 2.1. cryptography python import cryptography cryptography.__version__ quit() 2.2. ssl python import ssl ssl.OPENSSL_VERSION quit()

Linux 공통

Set date

2020-01-312020-02-23

1. Intro Set date, time 2. Command 2.1. sync NTP : rdate rdate -s time.nist.gov 2.2. manually set date : date date -s “2020-01-31 19:10:00”

CentOS

CentOS SSH OTP

2020-01-162021-01-15

1. Intro I want to configure OTP to use SSH connection to CentOS server. 2. Setup 2.1. install package yum install -y libtool pam-devel ntp git 2.2. setup ntpd The reason for using ntpd is that OTP is time-based. service ntpd start chkconfig ntpd on chkconfig –list ntpd 2.3. git clone & setup google […]

Raspbian Ubuntu

Ubuntu SSH OTP

2020-01-162020-03-06

1. Intro I want to configure OTP to use SSH connection to Ubuntu server. 2. Setup 2.1. install google OTP sudo apt install libpam-google-authenticator 2.2. setup pam.d, sshd config # pam.d 맨 위에 추가시 Login ID → OTP code → PW 맨 아래 추가시 Login ID → PW → OTP code nullok : otp […]

Tools

Write Timestamp on Notepad++

2020-01-07

1. Intro If you want write timestamp on notepad++ like notepad(windows) shortcut F5 2. How to do? 2.1. Install Plugin Notepad++ > Plugins > Install “TextFX Characters” 2.2. Set Shortcut Notepad++ > Settings > Shortcut Mapper… > Plugin commands > “I:Date & Time – short format” Double Click

Windows