01 2021 档案

摘要：though writing in english is much cooler , but I think I still need to figure out how to install Chinese input method on Debian sudo apt-get install i 阅读全文

摘要：starting from the very beginning again, because when looking back , I really don't understand what I am trying to say now. Sad 阅读全文

摘要：lvm-link 1. How to check existing LV|VG|PV 2. How to enlarge exisiting VG 3. How to enlarge existing LV 4. How delete a LV|VG 5. what if the added HDD 阅读全文

摘要：: "${LOG_FILE:=/var/log/factory_install.log}" Shell Parameter Expansioin ${parameter:=word} If parameter is unset or null, the expansion of word is as 阅读全文

摘要：true && echo “a” || echo “b” result :a false && echo “a” || echo “b” result : b 阅读全文

摘要：Log in to your system and type echo $SHELL at the prompt. You will see a response containing sh, csh, ksh or b ash. You need to find out where bash is 阅读全文