UPX是一种免费的，可移植的，可扩展的高性能可执行打包程序，适用于多种可执行格式。
可用于压缩可执行文件，具体使用方式如下所示：
sugoi@sugoi:~$ upx -h
Ultimate Packer for eXecutables
Copyright (C) 1996 - 2020
UPX 3.96 Markus Oberhumer, Laszlo Molnar & John Reiser Jan 23rd 2020
Usage: upx [-123456789dlthVL] [-qvfk] [-o file] file..
Commands:
-1 compress faster -9 compress better
--best compress best (can be slow for big files)
-d decompress -l list compressed file
-t test compressed file -V display version number
-h give this help -L display software license
Options:
-q be quiet -v be verbose
-oFILE write output to 'FILE'
-f force compression of suspicious files
--no-color, --mono, --color, --no-progress change look
Compression tuning options:
--brute try all available compression methods & filters [slow]
--ultra-brute try even more compression variants [very slow]
Backup options:
-k, --backup keep backup files
--no-backup no backup files [default]
Overlay options:
--overlay=copy copy any extra data attached to the file [default]
--overlay=strip strip any extra data attached to the file [DANGEROUS]
--overlay=skip don't compress a file with an overlay
Options for djgpp2/coff:
--coff produce COFF output [default: EXE]
Options for dos/com:
--8086 make compressed com work on any 8086
Options for dos/exe:
--8086 make compressed exe work on any 8086
--no-reloc put no relocations in to the exe header
Options for dos/sys:
--8086 make compressed sys work on any 8086
Options for ps1/exe:
--8-bit uses 8 bit size compression [default: 32 bit]
--8mib-ram 8 megabyte memory limit [default: 2 MiB]
--boot-only disables client/host transfer compatibility
--no-align don't align to 2048 bytes [enables: --console-run]
Options for watcom/le:
--le produce LE output [default: EXE]
Options for win32/pe, win64/pe, rtm32/pe & arm/pe:
--compress-exports=0 do not compress the export section
--compress-exports=1 compress the export section [default]
--compress-icons=0 do not compress any icons
--compress-icons=1 compress all but the first icon
--compress-icons=2 compress all but the first icon directory [default]
--compress-icons=3 compress all icons
--compress-resources=0 do not compress any resources at all
--keep-resource=list do not compress resources specified by list
--strip-relocs=0 do not strip relocations
--strip-relocs=1 strip relocations [default]
Options for linux/elf:
--preserve-build-id copy .gnu.note.build-id to compressed output
file.. executables to (de)compress
This version supports:
amd64-darwin.dylib dylib/amd64
amd64-darwin.macho macho/amd64
amd64-linux.elf linux/amd64
amd64-linux.kernel.vmlinux vmlinux/amd64
amd64-win64.pe win64/pe
arm-darwin.macho macho/arm
arm-linux.elf linux/arm
arm-linux.kernel.vmlinux vmlinux/arm
arm-linux.kernel.vmlinuz vmlinuz/arm
arm-wince.pe arm/pe
arm64-darwin.macho macho/arm64
arm64-linux.elf linux/arm64
armeb-linux.elf linux/armeb
armeb-linux.kernel.vmlinux vmlinux/armeb
fat-darwin.macho macho/fat
i086-dos16.com dos/com
i086-dos16.exe dos/exe
i086-dos16.sys dos/sys
i386-bsd.elf.execve bsd.exec/i386
i386-darwin.macho macho/i386
i386-dos32.djgpp2.coff djgpp2/coff
i386-dos32.tmt.adam tmt/adam
i386-dos32.watcom.le watcom/le
i386-freebsd.elf freebsd/i386
i386-linux.elf linux/i386
i386-linux.elf.execve linux.exec/i386
i386-linux.elf.shell linux.sh/i386
i386-linux.kernel.bvmlinuz bvmlinuz/i386
i386-linux.kernel.vmlinux vmlinux/i386
i386-linux.kernel.vmlinuz vmlinuz/i386
i386-netbsd.elf netbsd/i386
i386-openbsd.elf openbsd/i386
i386-win32.pe win32/pe
m68k-atari.tos atari/tos
mips-linux.elf linux/mips
mipsel-linux.elf linux/mipsel
mipsel.r3000-ps1 ps1/exe
powerpc-darwin.macho macho/ppc32
powerpc-linux.elf linux/ppc32
powerpc-linux.kernel.vmlinux vmlinux/ppc32
powerpc64-linux.elf linux/ppc64
powerpc64le-darwin.macho macho/ppc64le
powerpc64le-linux.elf linux/ppc64le
powerpc64le-linux.kernel.vmlinux vmlinux/ppc64le
UPX comes with ABSOLUTELY NO WARRANTY; for details visit https://upx.github.io编译 Go 程序时使用链接器标记（linker flags）来减小输出文件大小，但是，同时使用 -w 和 -s 标记会带来叠加的问题，而不是叠加的效果。
-w 和 -s 标志通常用在 App 链接阶段和 Go 编译阶段与 -ldflags 指令结合使用。
-w：删除编译后的二进制文件中的DWARF（一种可以包含在二进制文件中的调试数据格式）信息-s：不仅删除了调试信息（DWARF），同时还删除了指定的符号表（包含了局部变量、全局变量和函数名等信息）和字符串表因此，如果要删除调试信息，使用-w，如果要删除符号和字符串表，使用-s。
反面教材：
go build -ldflags="-w -s" .