osx

ln

ln -sfn /path/to/source /path/to/link

/path/to/source：源文件或目录
/path/to/link：要创建的链接名

-s symbolic 创建软链接（符号链接），而不是硬链接。
-f force 如果目标文件已存在，则强制删除后再创建新链接（覆盖）。
-n no dereference，如果目标已是符号链接，仅删除链接本身，不跟随其指向的内容

brew

brew install --cask google-chrome
# --cask 代表安装图形界面应用（比如谷歌浏览器）

# brew cask install google-chrome
# 旧用法（已废弃）

icloud

cd ~/Library/Mobile\ Documents/com~apple~CloudDocs/
# icloud云盘物理路径

diskutil

diskutil list
# 查看磁盘列表

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:             Apple_APFS_ISC Container disk1         524.3 MB   disk0s1
   2:                 Apple_APFS Container disk3         245.1 GB   disk0s2
   3:        Apple_APFS_Recovery Container disk2         5.4 GB     disk0s3

/dev/disk3 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +245.1 GB   disk3
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            11.3 GB    disk3s1
   2:              APFS Snapshot com.apple.os.update-... 11.3 GB    disk3s1s1
   3:                APFS Volume Preboot                 7.2 GB     disk3s2
   4:                APFS Volume Recovery                1.1 GB     disk3s3
   5:                APFS Volume Data                    208.9 GB   disk3s5
   6:                APFS Volume VM                      2.1 GB     disk3s6

/dev/disk4 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *123.0 GB   disk4
   1:                        EFI EFI                     209.7 MB   disk4s1
   2:       Microsoft Basic Data 128GB                   122.8 GB   disk4s2

diskutil unmountDisk /dev/disk4
# Unmount of all volumes on disk4 was successful
# 卸载U盘

diskutil eraseDisk exFAT <UDISK_NAME> /dev/disk4
# UDISK_NAME 设置U盘的名称

Started erase on disk4
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk4s2 as ExFAT with name DATA
Volume name      : DATA
Partition offset : 411648 sectors (210763776 bytes)
Volume size      : 239915008 sectors (122836484096 bytes)
Bytes per sector : 512
Bytes per cluster: 131072
FAT offset       : 2048 sectors (1048576 bytes)
# FAT sectors    : 8192
Number of FATs   : 1
Cluster offset   : 10240 sectors (5242880 bytes)
# Clusters       : 937128
Volume Serial #  : 6854146c
Bitmap start     : 2
Bitmap file size : 117141
Upcase start     : 3
Upcase file size : 5836
Root start       : 4
Mounting disk
Finished erase on disk4