Re-compress all Mame zip roms to 7z format

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

bash从字符串中解析出带引号的变量

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#!/bin/bash
#shebang must be bash.
 
print_args()
{
	echo "1st is [$1]"
	echo "2nd is [$2]"
	echo "3rd is [$3]"
	echo "4th is [$4]"
	echo "5th is [$5]"
	echo "6th is [$6]"
	echo "7th is [$7]"
	echo "8th is [$8]"
}
 
VAR1=(1 2 "3 4" 5)
print_args "${VAR1[@]}"
 
VAR2="11 22 \"33 44\" 55"
#eval "VAR2=($VAR2)"
declare -a "VAR2=($(echo $VAR2 | tr '`$<>' '????'))"
print_args "${VAR2[@]}"

refer to:
https://superuser.com/questions/1066455/how-to-split-a-string-with-quotes-like-command-arguments-in-bash

linux命令备忘录

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

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/

Bash读取某一行某一列

打印第11行:
sed -n "11, 1p" /tmp/tmp.txt
或者
awk 'NR == 11 {print}' /tmp/tmp.txt

打印第3列:
awk '{print $3;}' /tmp/tmp.txt

打印总行数:
awk 'END {print NR}' /tmp/tmp.txt