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+# <center>commonly used combination commands</center>
+#### <center>Author: Stranger</center>
+#### <center>2022-04-23 00:16:10</center>
+
+There is not much content, if there are useful commands collected, it will be updated here as soon as possible
+
+1. Install header files
+
+```
+sudo apt install linux-headers-`uname -r`
+```
+
+2. Update boot
+
+```
+sudo update-grub
+```
+
+3. Check if a package is installed
+
+```
+dpkg -l|grep package name or some characters contained in the package name
+```
+
+4. Dual system time synchronization
+```
+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
+```
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