[Comprehensive explanation of Linux commands] 170. In-depth understanding of htop: the functions and usage of interactive process viewer in Linux

htop

htopIt is an interactive process viewer that can dynamically observe the system process status.

Additional information

htopCommand is an interactive process viewer in Linux systems, a text-mode application (in the console or X terminal), required ncurses.

Compared with traditional Linux top, htopit is more user-friendly. It allows users to operate interactively, supports color themes, can scroll through the process list horizontally or vertically, and supports mouse operations.

Compared with top, htopit has the following advantages:

• You can scroll through the process list horizontally or vertically to see all processes and the complete command line.
• On startup, topfaster than.
• There is no need to enter the process ID when killing a process.
• htopSupport mouse operation.

topshortcoming:

• Only keyboard operation is supported.
• The display is also monotonous.

htopOfficial website: http://htop.sourceforge.net/

grammar

htop

parameter

-C --no-color               使用单色配色方案
-d --delay=DELAY            设置更新之间的延迟，在十秒
-s --sort-key=COLUMN        纵列排序(try --sort-key=help for a list)
-u --user=USERNAME          只显示一个指定用户的进程
-p --pid=PID,[,PID,PID...]  只显示给用户
-h --help                   打印此命令帮助
-v --version                打印版本信息

Options

• h, ?:F1: View htop usage instructions
• S:F2: Settings
• /:F3: Search process
• \:F4: Filter, search by keyword
• t:F5: Display tree structure
• <, >:F6: Select sorting method
• [:F7: Reduce the nice value so that the priority of the corresponding process can be increased
• ]:F8: Increase the nice value, which can reduce the priority of the corresponding process
• k:F9: Kill the selected process
• q:F10: Exit htop

shortcut key

• /:Search character
• h:Show help
• l: Display the files opened by the process: If lsof is installed, press this key to display the files opened by the process.
• u: Displays all users and can select processes of a specific user
• U: Unmark all processes
• s: System call that will call strace to trace the process
• t:Show tree structure
• H:Show/hide user threads
• I:Reverse sort order
• K:Show/hide kernel threads
• M: Sort by memory usage
• P: Sort by CPU
• T: Sort by running time
• Up and down keys or PgUP, PgDn: move the selected process
• Left and right keys or Home, End: move the list
• Space: mark/unmark a process. Commands can act on multiple processes, for example "kill" will apply to all marked processes

Htop settings

Click the mouse Setupor press F2 to enter the htop setting page.

1. Meters: Set the display information at the top, which is divided into left and right sides. The Left column represents the information displayed on the left side, and the Right column represents the information displayed on the right side. If you want to add a new option, you can choose to add it. F5 adds it to the top left side Available meters. , F6 is added to the upper right side. The options under the Left column and Right column can select the display mode of information, including LED, Bar (progress bar), and Text (text mode), which can be set according to personal preferences.

2. Display options: Select the content to be displayed and press the space x to display it. After selecting, press F10 to save.

3. Colors: Setting the color to display the interface, I personally think it is not very useful, and everyone has different preferences.

4. Colums: The function is to add or cancel various contents to be displayed. After selection, F7 (move up), F8 (move down), F9 (cancel display), F10 (save changes). PPID and PGRP are added here to display that information according to everyone's needs.

• F3: Search process

Press F3 or directly enter "/" in the interface to directly enter the search mode. The search is based on the process name. The searched processes will be marked with the set color for easy viewing.

• F4: Filter

It is equivalent to fuzzy search and is not case-sensitive. After entering the content to be searched below, the interface will only display the searched content, making it more convenient to view.

• F5: Display in tree form

• F6: Sorting method

After pressing F6, you will jump to a tree display interface, allowing you to choose how to sort. Select what you want to sort under Sort by.

• F7, F8: Adjust the process nice value

F7 means to decrease the nice value (increase the priority), and F8 to increase the nice value (decrease the priority). Select a process and press F7 or F8 to increase or decrease the nice value. The nice value range is -20- 19.

• F9: Kill process

Select a process and press F9 to kill it, which is very convenient.

• F10: Exit htop

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