add en/Development-And-Common-Documents/Commonly_Combination_Commands.md.

Signed-off-by: 康艳红 <731193006@qq.com>
2023-03-23 08:45:02 +00:00 · 2023-03-23 08:45:02 +00:00 · 74b32fa788
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+# <center>Common combination commands</center
+#### <center>Author: stranger</center
+#### <center>2022-04-23 00:16:10</center
+
+Not much content yet, will update to this as soon as I have collected useful commands
+
+1. Install the header file
+
+```
+sudo apt install linux-headers-`uname -r`
+
+```
+
+2. update the boot
+
+```
+sudo update-grub
+
+```
+
+3. Check if a package is installed
+
+```
+dpkg -l|grep 包名或者是包名里包含的部分字符
+
+```
+
+4. synchronize the time of dual systems
+
+```
+sudo timedatectl set-local-rtc 1
+sudo hwclock --localtime --systohc
+
+```
+
+
+5. merge two files (merge file1.txt and file2.txt into file.txt)
+
+```
+cat file1.txt file2.txt > file.txt
+
+```