Keep It Simple, Stupid

hongy19’s blog

Regular expression


“$” are different in basic regular expression and extend regular expression, see https://stackoverflow.com/questions/38114132/why-does-dollar-not-match-literal-dollar-when-extended-regex-ere-option-is-use.

https://www.gnu.org/software/findutils/manual/html_node/find_html/posix_002degrep-regular-expression-syntax.html#posix_002degrep-regular-expression-syntax

  • posix-egrep’ regular expression syntax:
  • The characters ‘^’ and ‘$’ always represent the beginning and end of a string respectively, except within square brackets. Within brackets, ‘^’ can be used to invert the membership of the character class being specified.
  • ‘posix-basic’ regular expression syntax:

    • The character ‘^’ only represents the beginning of a string when it appears:

      • At the beginning of a regular expression

        …
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Stack


  • basic concept (from link)
  • ghc only knows about packages that are installed. Installed packages live in package databases
  • ghc-pkg is package tool from ghc and ghc know two database
  • database is a directory, usually called package.conf.d, that contains a file for each package, together with a binary cache of the package data in the file package.cache
  • global package database, which comes with your GHC installation, e.g. /usr/lib/ghc-6.12.1/package.conf.d.
  • user package database private to each user, e.g. $XDG_DATA_HOME/ghc/arch-os-version/package.conf.
  • While we assume in general that LTS snapshots never change, there’s nothing that technically prohibits that from happening. Instead, the complete version of that field is

resolver:  size: 496662
  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/13/9.yaml
  sha256: 83de9017d911cf7795f19353dba4d04bd24cd40622b7567ff61fc3f7223aa3ea

…
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Windows


  • 解决Windows10英文版中文字体难看、时大时小、中文比英文小等问题
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontLink\SystemLink
  • 把 MSYH.TTC,Microsoft YaHei UI,128,96 MSYH.TTC,Microsoft YaHei UI放在Segoe UI，Tahoma，Microsoft Sans Serif的前面。
  • seelink1, link2, link3
  • chrome installation
  • chrome的proxy setting用的是windows system proxy setting，而公司的新电脑上system proxy是不可以更改的。在这种情况下，安装完chrome后是无法sync and install extension。可以用google-chrome –proxy-server=“socks://localhost:8080"的方式用命令行来设置chrome proxy，后就可以sync and install extension。
  • 公司电脑的政策是只有whitelist里的extension是可以安装的，可以用SwitchyOmega切换proxy
  • WSL
  • Windows 10 21H2里的wsl (Arch)默认还是wsl1，需要在setting ->Apps & feature -> Optional features -> more windows features里安装"windows subsystem for linux” (for WSL1) and “virtual machine platform” (for WSL2)
  • Arch by default is WSL1，可以先把老的ext4.vhdx改名，再把wsl1 convert to wsl2，然后再把old hvdx的文件名改回ext4.vhdx及可。
  • backup for new laptop
  • onedrive, outlook,edge, chrome都是cloud based的，不用特殊备份
  • netid里的老证书也可以从网上下载，不用备份
  • backup chrome SwitchyOmega配置, .wslconfig in $user$ folder
  • WSL(arch)需要把相关文件拷贝到onedrive里，安装完成后再copy出来。
  • 其它非onedriver folder backup: log
…
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