# Ctrl + A - Go to the beginning of the line you are currently typing on
# Ctrl + E - Go to the end of the line you are currently typing on
切到命令行开始｜结尾
# Ctrl + L - Clears the Screen， similar to the clear command
清屏，类似于 clear 命令
# Ctrl + U - Clears the line before the cursor position. If you are at the end of the line， clears the entire line.
清除光标以前
# Ctrl + H - Same as backspace
退格键 backspace
# Ctrl + R - Let‘s you search through previously used commands
从命令历史中找
# Ctrl + C - Kill whatever you are running
终止命令
# Ctrl + D - Exit the current shell
退出 shell
# Ctrl + Z - Puts whatever you are running into a suspended background process. fg restores it.
？？
# Ctrl + W - Delete the word before the cursor
清除光标之前
# Ctrl + K - Clear the line after the cursor
清除光标之后
# Ctrl + T - Swap the last two characters before the cursor
# Esc + T - Swap the last two words before the cursor
切换光标前最后两个字母（单词）
# Alt + F - Move cursor forward one word on the current line
# Alt + B - Move cursor backward one word on the current line
？？在 ubuntu x windows终端中会切换到菜单！tty 可能可以
# Tab - Auto-complete files and folder names
自动补全
# Ctrl + Y - to paste it （as in delete and copy） all text in front of the cursor
粘贴（刚才 ctrl+w 或者 ctrl+k 的内容）
# Esc + . （or Esc + Underscore） - Insert Last Argument
？？
# Ctrl + b - Move back a character
# Ctrl + f - Move forward a character
向前｜后移动一个字母
# Ctrl + r - Search the history backwards
？？
# Ctrl + xx - Move between EOL and current cursor position
光标在当前位置和 EOL 之间切换（EOL end of line？但我实验，是在开头和当前位置之间切换，怎么理解？谁知道？）
# Ctrl + x @ - Show possible hostname completions
# Alt +
# Alt + > - Move to the last line in the history
# Alt + ？ - Show current completion list
# Alt + * - Insert all possible completions
# Alt + / - Attempt to complete filename
# Alt + . - Yank last argument to previous command
# Alt + c - Capitalize the word
# Alt + d - Delete word
# Alt + l - Make word lowercase
# Alt + n - Search the history forwards non-incremental
# Alt + p - Search the history backwards non-incremental
# Alt + r - Recall command
# Alt + t - Move words around
# Alt + u - Make word uppercase
# Alt + back-space - Delete backward from cursor
# Here "2T" means Press TAB twice
# $ 2T - All available commands（common）
# $ （string） 2T - All available commands starting with （string）
# $ /2T - Entire directory structure including Hidden one
# $ 2T - Only Sub Dirs inside including Hidden one
# $ *2T - Only Sub Dirs inside without Hidden one
# $ ~2T - All Present Users on system from "/etc/passwd"
# $ $2T - All Sys variables
# $ @2T - Entries from "/etc/hosts"
# $ =2T - Output like ls or dir