This is the second day of my participation in Gwen Challenge
This article is based on Arthas version 3.5.1 and introduces the use and implementation of basic commands PWD, Plaintext, WC,keymap.
A. The PWD command
Returns the current working directory, similar to the Linux command
Files at com.taobao.arthas.core.com mand. Basic1000. PwdCommand. Java.
New File(“”).getabsolutePath () returns the current working directory.
Second, plaintext command
Remove ANSI colors from the output
Files at com.taobao.arthas.core.shell.com mand. Internal. PlainTextHandler. Java.
Actually is the method called RenderUtil ansiToPlainText.
The method removes the color and then outputs the text by passing the\u001b[[;\d]*mReplace to achieve ANSI color removal.
3. The wc command
Statistics the output by row.
Files at com.taobao.arthas.core.shell.com mand. Internal. WordCountHandler. Java.
| The parameter name | Parameters of the abbreviations | Parameters that | mandatory | The sample |
|---|---|---|---|---|
| -l | Count the number of output lines | mandatory | jad demo.MathGame main | wc -l |
Split statistics by rowinput.split("\n").length.
4. Keymap command
The keymap command displays the current shortcut key mapping list. The keymap command can be used only in terminal mode.
The default output is as follows:
| shortcuts | Shortcut Keys | Name of the command | The command that |
|---|---|---|---|
| \C-a | ctrl + a | beginning-of-line | Jump to the beginning of a line |
| \C-e | ctrl + e | end-of-line | Jump to the end of each line |
| \C-f | ctrl + f | forward-word | Move one word forward |
| \C-b | ctrl + b | backward-word | Move one word back |
| \e[D | Keyboard left arrow key | backward-char | Move the cursor forward one character |
| \e[C | Keyboard right arrow key | forward-char | Move the cursor back one character |
| \e[A | Arrow keys on the keyboard | history-search-backward | Scroll up to display the previous command |
| \e[B | Arrow keys under the keyboard | history-search-forward | Scroll down to show the next command |
| \C-h | ctrl + h | backward-delete-char | Deletes one character backwards |
| \C-? | ctrl + shift + / | backward-delete-char | Deletes one character backwards |
| \C-u | ctrl + u | undo | To undo the previous command is equivalent to clearing the current line |
| \C-d | ctrl + d | delete-char | Deletes the character where the cursor is located |
| \C-k | ctrl + k | kill-line | Deletes all characters from the current cursor to the end of the line |
| \C-i | ctrl + i | complete | Automatic completion, equivalent to pressing TAB |
| \C-j | ctrl + j | accept-line | Ending the current line is equivalent to hitting enter |
| \C-m | ctrl + m | accept-line | Ending the current line is equivalent to hitting enter |
Files at com.taobao.arthas.core.com mand. Basic1000. KeymapCommand. Java.
The helper.loadInputrcfile () method obtains the shortcut key
1. The load directory $USER_HOME /. Arthas/conf/inputrc shortcuts for user-defined file 2. . Get the default file ShellServerOptions DEFAULT_INPUTRC namely path for com/taobao/arthas/core/shell/term/readline inputrc file. 3. If not found the use of com. Alibaba. Middleware: termd – corejar package the shortcut file, otherwise an error cannot load this file. \
After reading, if the description starting with # is a comment, ignore it and use colons to separate the shortcut keys and command names. The renderUtil. render method generates string content in tabular form.