Linux

Burn iso to USB stick for Windows installation

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  • Rufus, released only in Windows.

    https://rufus.ie/en/
    https://github.com/pbatard/rufus

  • WoeUSB, can run in Linux.

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    dnf install WoeUSB
# /dev/sdd is the u-disk
woeusb --device /path/to/cn_windows_10_enterprise_ltsc_2019_x64_dvd_9c09ff24.iso /dev/sdd

Build qt source in Fedora35

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Extract qt-everywhere-src-6.2.2.zip to directory named qt,

sudo dnf install libxcb libxcb-devel xcb-util xcb-util-devel xcb-util-*-devel libX11-devel libXrender-devel libxkbcommon-devel libxkbcommon-x11-devel libXi-devel libdrm-devel libXcursor-devel libXcomposite-devel

cd qt
mkdir bld
cd bld
cmake -G Ninja -DCMAKE_INSTALL_PREFIX:PATH=`pwd`/installed -DCMAKE_BUILD_TYPE="Debug" ..
cmake --build . --parallel
cmake --install . --prefix=`pwd`/installed

Can't locate English.pm in @INC

sudo dnf install perl-English

This application failed to start because no Qt platform plugin could be init...

If "xcb" things missing, we should "dnf install libxcb..." like above, and an annoying step we can't image is after we install required packages, we must delete CMakeCache.txt first and then to invoke cmake, if not, some modules like xcb-sm are always displayed not to be built.

Feature accessibility_atspi_bridge is already defined to be "OFF" and should now be set to "ON" when importing features from Qt6::Gui.

We only need to not let the message interrupt building progress,

/mnt/SDC2/qt/bld/installed/lib/cmake/Qt6/QtFeature.cmake:1136

	message(STATUS "Feature ${feature} is already defined to be \"${QT_FEATURE_${feature}}\" and should now be set to \"${value}\" when importing features from ${target}.")

refer to:
https://download.qt.io/official_releases/qtcreator/6.0/6.0.1/qt-creator-opensource-linux-x86_64-6.0.1.run
https://wiki.qt.io/Building_Qt_5_from_Git#Linux.2FX11
https://forum.qt.io/topic/121386/built-qt6-from-sources-problem-with-xcb-plugin/15
https://forum.qt.io/topic/128887/build-qt6-from-source-xcb-issue/3
https://forum.qt.io/topic/92834/configure-errors-disabling-x11-accessibility-bridge-d-bus-or-at-spi-is-missing/7

Debug ue4 in Fedora35

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After running Setup.sh and GenerateProjectFiles.sh, we found UE4.pro created. It's like a fresh breeze coming from the roof window, we are free now, no more need to fear the once unbearable torment in Visual Studio IDE.

Qt source is not necessary to ue4, qtcreator is only a visual debugger to ue4.

Build Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug -j8

Clean Steps:

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make UE4Editor-Linux-Debug ShaderCompileWorker-Linux-Debug ARGS=-clean -j8

refer to:
https://docs.unrealengine.com/4.27/en-US/SharingAndReleasing/Linux/BeginnerLinuxDeveloper/SettingUpQtCreator/

Re-compress all Mame zip roms to 7z format

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In advance,

trans_to_7z.sh

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#!/bin/bash
 
PARENTDIR=$1
TMPDIR=`pwd`/tmp
 
PATH="/d/cext/Program Files/7-Zip:$PATH"
 
ISERR="no"
 
if [ "x$1" = x ] ; then
	echo "Please input dir to transform."
	exit
fi
 
if [ -e "$TMPDIR" ] ; then
	echo "Please rmdir [$TMPDIR] first."
	exit
fi
 
cd "$PARENTDIR"
 
get_win_path()
{
	local win_path="$1"
	win_path="${win_path#/}"
	win_path="${win_path//\//\\}"
	win_path="${win_path/\\/\:\\}"
	echo $win_path
}
 
for fn in `ls *.zip`; do
 
	echo "$fn"
 
	mkdir "$TMPDIR"
 
	7z x $fn -o"`get_win_path \"$TMPDIR\"`"
	NEWFN="`pwd`/${fn%.zip}.7z"
	(
		cd "$TMPDIR"
		7z a -mx9 "`get_win_path \"$NEWFN\"`" || ( echo "Creating 7z file failed." && ISERR="yes" )
		ls
	)
 
	rm -Rf "$TMPDIR"
 
	if [ $ISERR = "yes" ]; then
		exit
	fi
done
 
echo "Transforming done."

How to use?

Copy trans_to_7z.sh to Mame root folder which contains roms sub-directory, right click at blank place of this Mame root window in Explorer, select "Git Bash Here" which prompts bash console, input below and return,

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./trans_to_7z.sh roms

refer to:
https://www.cnblogs.com/wq242424/p/15564203.html

Install bare metal Linux dual booting with Windows

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Installing Fedora is very straight forward, but

  • When clicking some avi suffix video file, I was prompted a GStreamer page, but no link to install missing plugins.

However I learnt

  • One disk must have its own EFI partition. For nowaday notebook usually has an SSD and an HDD, while SSD already has an EFI partition, when we have to install the second OS in HDD, the HDD must allocate an EFI partition too.
  • When we burn OS iso image into U-disk using UltraIso tool, we must select "RAW" mode, not others like "HDD+" mode.

'vboxdrv': Key was rejected by service

sudo dnf update
sudo dnf install mokutil

mkdir /root/signed-modules
cd /root/signed-modules
openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=VirtualBox/"
chmod 600 MOK.priv

mokutil --import MOK.der

#After rebooting system

for modfile in $(dirname $(modinfo -n vboxdrv))/*.ko; do
  echo "Signing $modfile"
  /usr/src/kernels/$(uname -r)/scripts/sign-file sha256 \
                                /root/signed-modules/MOK.priv \
                                /root/signed-modules/MOK.der "$modfile"
done

To play avi, rmvb files and so on, 

dnf install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm
dnf install https://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-$(rpm -E %fedora).noarch.rpm
dnf install vlc

Not set default editor to nano in cscope, 

cd /etc/profile.d
mv nano-default-editor.sh nano-default-editor.sh0

No sound? 

vi /etc/pulse/default.pa
	load-module module-alsa-sink device=dmix
	load-module module-alsa-source device=dsnoop
reboot

This method doesn't go very well, but I know the reason, I had replaced pipewire with pulseaudio while pipewire is the next generation.

Update grub, 

grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg

refer to:
https://www.tecmint.com/install-vmware-workstation-in-linux/
https://stackoverflow.com/questions/61248315/sign-virtual-box-modules-vboxdrv-vboxnetflt-vboxnetadp-vboxpci-centos-8
https://www.videolan.org/vlc/download-fedora.html
https://blog.csdn.net/weixin_41446370/article/details/116711350
http://blog.sina.com.cn/s/blog_628ba3e00102xvnk.html
https://blog.csdn.net/wujuncheng1996/article/details/83546929
https://mirror.tuna.tsinghua.edu.cn/help/rpmfusion/

how to turn off fans in linux

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after running 'sensors-detect' command, kernel modules controlling fan speed should be loaded.

here is an occasion with 'Nuvoton NCT6102D/NCT6104D/NCT6106D Super IO Sensors' detected.

as nct6775 document said:

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#/sys/class/hwmon/hwmon4
pwm[1-7]
    - this file stores PWM duty cycle or DC value (fan speed) in range:
	   0 (lowest speed) to 255 (full)
 
pwm[1-7]_enable
    - this file controls mode of fan/temperature control:
	* 0 Fan control disabled (fans set to maximum speed)
	* 1 Manual mode, write to pwm[0-5] any value 0-255
	* 2 "Thermal Cruise" mode
	* 3 "Fan Speed Cruise" mode
	* 4 "Smart Fan III" mode (NCT6775F only)
	* 5 "Smart Fan IV" mode
...

ps1. if set pwm[1-7]_enable to 0, we will not be able to change it to other value, unless reboot linux.
ps2. I still can't find a common way to turn off fans using ipmitool.

IPMI: Intelligent Platform Management Interface
BMC: Baseboard Management Controller
FRU: Field Replaceable Unit

refer to:
[linux-kernel-src-root]/Documentation/hwmon/nct6775.rst
https://bbs.archlinux.org/viewtopic.php?id=225349

linux命令备忘录

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名词

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pie: position-independent executable
pic: position-independent code
aslr: address space layout randomization
got: global offset table
vdso: virtual dynamic shared object

Basic command

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grep [OPTION]... PATTERNS [FILE]...
find [-H] [-L] [-P] [-Olevel] [-D debugopts] [path...] [expression]
find . -size +2G -exec du -sh {} \;
ps axl | grep VirtualBoxVM | grep -v grep | awk '{print $3};'
cat /etc/passwd | sort -k5,5 -t: | column -t -s:
while true; do echo sleep 1 sec; sleep 1; cat /home/work/aa.txt 2>/dev/null && echo ok && break; done
echo first | xargs -i echo {} second
 
cat /etc/shadow
sudo !!
 
cd other_dir
cd - # return back

swap文件

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dd if=/dev/zero of=./swap_file bs=1G count=8
mkswap ./swap_file
swapon ./swap_file
swapoff ./swap_file

objcopy

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objcopy -I binary -O elf32-i386 -B i386 test.jpg test.o
objdump -s -b binary test.o
readelf -s test.o

静态链编stdc++

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-Bstatic -lstdc++ -Bdynamic

工具

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systemtap
inotify-tools
windres
reptyr

自启动

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#/lib/systemd/system/mytask.service
#ln -s /lib/systemd/system/mytask.service /etc/systemd/system/multi-user.target.wants/mytask.service
[Unit]
Description=mytask
After=network.target
 
[Service]
Type=simple
ExecStart=mytask.sh
 
[Install]
WantedBy=multi-user.target

ubuntu

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#网络配置文件路径，默认DHCP的连接不会生成文件
/etc/NetworkManager/system-connections/
#run arm64 binary on x86
dpkg --add-architecture armhf && apt-get update && apt-get install libc6:armhf
cat /proc/sys/fs/binfmt_misc/
qemu-user -L /home/bamanzi/i386-libs ./prog
#disable background process
systemctl disable unattended-upgrades
ss -tap
pv -d <pid>

centos

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#网络配置文件路径
/etc/sysconfig/network-scripts/ifcfg-
#compiz
https://spins.fedoraproject.org/mate-compiz/download/index.html

refer to:
http://blog.chinaunix.net/uid-28461677-id-5766451.html
https://blog.csdn.net/weixin_33842304/article/details/91443399
https://unix.stackexchange.com/questions/4034/how-can-i-disown-a-running-process-and-associate-it-to-a-new-screen-shell
https://blog.csdn.net/wuzhong8809/article/details/117450302
https://stackoverflow.com/questions/18312935/find-file-in-linux-then-report-the-size-of-file-searched
https://www.toutiao.com/a7073448755428688399/

linux驱动备忘录

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驱动签名

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CONFIG_MODULE_SIG=y
# CONFIG_MODULE_SIG_FORCE is not set
CONFIG_MODULE_SIG_ALL=y
 
${KERNEL_SRC}/scripts/sign-file sha512 ${KERNEL_SRC}/certs/signing_key.pem ${KERNEL_SRC}/certs/signing_key.x509 hello.ko

驱动调试

debugee

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MOD_NAME=simple_mod
insmod ./${MOD_NAME}.ko
MOD_TEXT=`cat /sys/module/${MOD_NAME}/sections/.text`
MOD_DATA=`cat /sys/module/${MOD_NAME}/sections/.data`
MOD_BSS=`cat /sys/module/${MOD_NAME}/sections/.bss`
MOD_ADD="add-symbol-file /path/to/${MOD_NAME}.ko ${MOD_TEXT} -s .data ${MOD_DATA} -s .bss ${MOD_BSS}"
echo ${MOD_ADD}

debugger

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(gdb) ${MOD_ADD}

refer to:
https://www.cnblogs.com/rivsidn/p/9481037.html
https://www.cnblogs.com/powerrailgun/p/12161295.html
https://blog.csdn.net/chdhust/article/details/8820628

vmware linux共享文件夹未启动

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sudo dnf install open-vm-tools-desktop
umount /mnt/hgfs
sudo /usr/bin/vmhgfs-fuse .host:/ /mnt/hgfs -o nonempty -o allow_other -o uid=1000 -o gid=1000 -o umask=022

如果还不行，比如更新内核后，就要重新安装open-vm-tools。

refer to:
https://blog.csdn.net/xcyja/article/details/117328301

linux关闭或开启网络端口

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关闭80端口

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iptables -A INPUT -ptcp --dport 80 -j DROP

而开启80端口要看情况，不能简单的一句

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iptables -A INPUT -ptcp --dport 80 -j ACCEPT

因为其中的-A表示append一条规则到规则链上，之前存在一条DROP链，其后再加一条ACCEPT链，80端口还是会被禁掉。

先用如下命令看一下规则链

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iptables -L

把DROP那一链删掉

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iptables -D INPUT -ptcp --dport 80 -j ACCEPT
iptables -D INPUT -ptcp --dport 80 -j DROP

如果默认是所有端口都禁用，那就在空链里加一条ACCEPT链。

最后保存

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iptables-save