Tree
它在显示文件之间的目录关系方面做得很好，这真的很酷。
commands
├── a.js
├── b.js
├── c.js
├── copy-apps
│ └── fe-apps
│ └── a.js
├── fe-apps
│ └── a.js
├── test.log
└── xxx
└── yyy在此之前，您需要安装命令树。
brew install tree然后只需在文件目录中执行tree即可。
wc
wc 是 word count 的缩写，常用于文件统计。它可以统计字数、行数、字符数、字节数等。
我经常用它来计算文件中的代码行数。
du
打印出一个目录的文件大小信息。我们使用它的频率较低，但它是一个非常值得学习的命令。
- du -h：打印出适合人类阅读的信息。
- du -a：列出目录中文件大小的信息；
- du -s：只显示总大小，不显示具体信息。
➜ commands git:(master) ✗ du
0 ./xxx/yyy
0 ./xxx
0 ./fe-apps
0 ./copy-apps/fe-apps
0 ./copy-apps
0 ./.git/objects/pack
0 ./.git/objects/info
0 ./.git/objects
8 ./.git/info
104 ./.git/hooks
0 ./.git/refs/heads
0 ./.git/refs/tags
0 ./.git/refs
136 ./.git
168 .
➜ commands git:(master) ✗ du -h
0B ./xxx/yyy
0B ./xxx
0B ./fe-apps
0B ./copy-apps/fe-apps
0B ./copy-apps
0B ./.git/objects/pack
0B ./.git/objects/info
0B ./.git/objects
4.0K ./.git/info
52K ./.git/hooks
0B ./.git/refs/heads
0B ./.git/refs/tags
0B ./.git/refs
68K ./.git
84K .
➜ commands git:(master) ✗ du -ha
4.0K ./a.js
0B ./xxx/yyy
0B ./xxx
0B ./fe-apps/a.js
0B ./fe-apps
4.0K ./test.log
0B ./copy-apps/fe-apps/a.js
0B ./copy-apps/fe-apps
0B ./copy-apps
4.0K ./c.js
4.0K ./.git/config
0B ./.git/objects/pack
0B ./.git/objects/info
0B ./.git/objects
4.0K ./.git/HEAD
4.0K ./.git/info/exclude
4.0K ./.git/info
4.0K ./.git/description
4.0K ./.git/hooks/commit-msg.sample
8.0K ./.git/hooks/pre-rebase.sample
4.0K ./.git/hooks/pre-commit.sample
4.0K ./.git/hooks/applypatch-msg.sample
4.0K ./.git/hooks/fsmonitor-watchman.sample
4.0K ./.git/hooks/pre-receive.sample
4.0K ./.git/hooks/prepare-commit-msg.sample
4.0K ./.git/hooks/post-update.sample
4.0K ./.git/hooks/pre-merge-commit.sample
4.0K ./.git/hooks/pre-applypatch.sample
4.0K ./.git/hooks/pre-push.sample
4.0K ./.git/hooks/update.sample
52K ./.git/hooks
0B ./.git/refs/heads
0B ./.git/refs/tags
0B ./.git/refs
68K ./.git
4.0K ./b.js
84K .
du -sh
alias
alias命令用于设置命令的别名。如果您仅键入别名，将列出所有当前别名设置。
让我们尝试为 git status 设置一个别名
alias gs="git status"
值得注意的是：如果你想让gs命令永久存在，你应该在.profile或.zshrc中设置它。
grep
我们经常需要查找服务器上日志文件的内容，grep将是我们得心应手的帮手。
有一个日志文件test.log。它包含以下内容：
const a = 1
const b = 2
const c = 3
console.log(a + b + c)如何突出显示包含 a 字符的位置？这很容易，不是吗？
grep a test.log
cat
cat 的主要用途是查看文件的内容并将其打印在屏幕上。
但它至少还有一些其他用途。
1.清除a.js的内容
➜ commands git:(master) ✗ cat a.js // There are two lines of code in a.js
const a = 'fatfish'
console.log(a)%
➜ commands git:(master) ✗ cat /dev/null > a.js // clear the contents of a.js
➜ commands git:(master) ✗ cat a.js // The content in a.js is cleared.
➜ commands git:(master) ✗
2.将a.js的内容复制到b.js
➜ commands git:(master) ✗ cat a.js
const name = 'fatfish'
console.log(name)
➜ commands git:(master) ✗ cat b.js // No content in b.js
➜ commands git:(master) ✗ cat a.js > b.js // Copy the contents of a.js to b.js
➜ commands git:(master) ✗ cat b.js // The content in b.js is the same as in a.js
const name = 'fatfish'
console.log(name)
➜ commands git:(master) ✗ cat a.js
const name = 'fatfish'
console.log(name)
3.将a.js的内容添加到c.js的最后一个字符
➜ commands git:(master) ✗ cat a.js
const name = 'fatfish'
console.log(name)%
➜ commands git:(master) ✗ cat c.js
const age = 100
console.log(age)
➜ commands git:(master) ✗ cat a.js >> c.js
➜ commands git:(master) ✗ cat c.js
const age = 100
console.log(age)const name = 'fatfish'
console.log(name)