Missing-L2-tools

Missing L2 useful tools

date: 2020-3-4
[^Asides]:说实话，所有的工具和efficient techniques都需要不断尝试才能让这些技巧起到更好的作用。

Find how to use commands

• 既然无法学会记住所有命令那么不妨试着去快速上手某些命令。

• man命令

• 但当man太过于详细时，一些有趣的工具比如tldr工具，要比man工具更加好用一些。

  Tldr give examples use cases of a command so you can quickly figure out which options to use.

• 可以尝试利用homebrew在macos的平台下载安装.

Find files

• find命令可以帮助我们递归寻找

  find
  
  Find files or directories under the given directory tree, recursively.
  
  - Find files by extension:
      find root_path -name '*.ext'
  
  - Find files by matching multiple patterns:
      find root_path -name '*pattern_1*' -or -name '*pattern_2*'
  
  - Find directories matching a given name, in case-insensitive mode:
      find root_path -type d -iname *lib*
  
  - Find files matching a path pattern:
      find root_path -path '**/lib/**/*.ext'
  
  - Find files matching a given pattern, excluding specific paths:
      find root_path -name '*.py' -not -path '*/site-packages/*'
  
  - Find files matching a given size range:
      find root_path -size +500k -size -10M
  
  - Run a command for each file (use `{}` within the command to access the filename):
      find root_path -name '*.ext' -exec wc -l {} \;
  
  - Find files modified in the last 7 days, and delete them:
      find root_path -mtime -7 -delete

• 当然，find的syntax不是那么好记的。

  part of the shell philosophy is good to use alternatives

  毕竟我们只能调用自己能记得住的命令。

  fd*则是find命令避免了一些tricky语法的比较好的替代。

• Locate 命令：实际通过目录结构寻找东西，c.f.数据库索引

Find Code

• 利用Linux自带的grep 命令我们可以更好的匹配我们的目标字符串和input text.

• 同样的利用 tldr grep我们可以得到很多grep命令。

  grep -R: recursive finding.

• grep -R 的alternative: ack, ag ,rg;

• rg: ripgrip

查找过去到现在已存在的命令

Find shell cmds

• *history * cmd

• history | grep [string]: 则是比较好的衔接我L1和L2之间的例子。

• Ctrl+R: perform backwards search through history.

  After pressing ctrl+r, you can type a subset you want to match for cmds in your history.

• A nice addition on top of Ctrl+r: interactive grep: fzf

• 很多命令需要自己尝试。

• 当你start一个cmd以空格开始时，这条命令的记录就不会被记录到你的shell history之中，这对你输入任何cmds with sensitive information的时候很有用

  if you make the mistake of not adding the leading space you can always remove the entry by editing you .bash_history or .zhistory.

Directory Navigation

• ln -s
• fasd: ranks files and directories by frecency
• Overview of a directory structure: tree, broot

[^Asides]:每个lecture notes后面都有exercise是很好的练习。

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