A: 安装ntpdate，并输入以下命令，可以解决每次开机自动更新时间问题. [S]
- sudo apt install ntpdate
- echo “natpdate edu.ntp.org.cn” >> /etc/profile
- chmod +s /usr/sbin/ntpdate
-
source /etc/profile
-
调整虚拟机设置-常规-高级里的”共享粘贴板”和”拖放”设置为”双向”. 依然无法粘贴. [F]
- 键入命令行 VBoxClient –clipboard 开起剪切板服务. [S]
- 将剪切板服务加入启动项,自动开启. [S] [220709]
- echo “VBoxClient –clipboard” | sudo tee -a /etc/profile [More Q4]
-
Ctrl + Shift + v 粘贴操作在 terminal 中已可将 windows 下复制网址进行粘贴.
-
如果之后还是会出现无法复制情况，按下列命令键入. [S] *[220709]
apt-get remove -y virtualbox-guest-x11
apt-get remove -y virtualbox-guest-dkms
apt-get remove -y virtualbox-guest-utils
reboot
wget https://download.virtualbox.org/virtualbox/6.1.2/VBoxGuestAdditions_6.1.2.iso
mkdir /media/iso
mount VBoxGuestAdditions_6.1.2.iso /media/iso -o loop
/media/iso/VBoxLinuxAdditions.run
yes
reboot
-
staging helps you split up one large change into multiple commit.
-
staging helps in reviewing changes.
-
staging helps when a merge has conflicts.
-
staging helps you keep extra local files hanging around.
-
staging helps you sneak in small changes.
-
例如问题 -bash: /etc/profile: Permission denied.
-
The redirection of the output is not performed by sudo.
-
进入 ~/.bashrc 里对 PS1 进行编辑，退出后利用 source ~/.bashrc 重新加载. [S]
- PS1颜色的设置格式： [ \033[ @m \ ]. 其中 @ 代表颜色值，如浅绿 1;32, 浅红 1;31.
A: /usr/include/x86_64-linux-gnu/bits/sigstack.h
-
define SIGSTKSZ 8192.
-
In Ubuntu this man page belongs to manpages-dev package.
-
sudo apt-get install manpages manpages-dev manpages-posix manpages-posix-dev.
A: 关键命令
-
Check for existing SSH Key: ls -al ~/.ssh.
-
Generate new SSH Key: ssh-keygen -t ed25519 -C “your_email@example.com”
-
Adding SSH Key to the ssh-agent: ssh-add ~/.ssh/id_rsa.
-
Copy the SSH public key to github account: cat ~/.ssh/id_rsa.pub.
-
Test SSH connection: ssh -T git@github.com.
A: A segmentation fault ( SEGFAULT ) occurs when you are trying to access memory which you should not be trying to access ( the memory which you have not allocated ) .
-
Writing to read-only memory rasies a segmentation fault.
-
Out of array range: Core Dump.
-
Global variable and local variable use the same name.
[220914]
* When dereferencing a NULL pointer.
-
When dereferencing an uninitialized or dangling pointer.
-
When you get a Buffer Overflow.
-
when you get a Stack Overflow.
-
When you try to change the value of a variable marked as const using pointers.
-
When you try to access free’d memory.
[S] [221120]
* 使用gdb调试找出问题程序行.
- Both exit(0) and exit(1) are jump statments and are used to terminate the program.
And both report the status of termination of the program to the operating system.
-
exit(0) define the clean exit without any error in the program.
-
exit(1) means that it is an abnormal or unsuccessful termianation of the program.
A: Tabular plugin
-
In Ubuntu 16.10, has enabled “–enable-default-pie” option by default.
-
specify “-no-pie” option during link stage of generating final executable binary.
-
the linker needs the library file to find the actual code to link into your program.
-
gcc hello1.c -o hello1 -lcurses. ( “-l”+”header” )
-
attempts to write to an uninitialised pointer.
Original: https://www.cnblogs.com/Dy2MoRaw/p/16457298.html
Author: Dy2MoRaw
Title: 日常问题日志
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