adb shell ls /system/bin

adb shell ls /system/bin

可以查看可用adb shell 命令。 并且大部分命令 可以通过 --help 获得参数帮助。例如，

adb shell cat --help

Toybox 0.8.4-android multicall binary: https://landley.net/toybox (see toybox --help)

usage: cat [-etuv] [FILE...]

Copy (concatenate) files to stdout.  If no files listed, copy from stdin.

Filename "-" is a synonym for stdin.

-e      Mark each newline with $

-t      Show tabs as ^I

-u      Copy one byte at a time (slow)

-v      Display nonprinting characters as escape sequences with M-x for

        high ascii characters (>127), and ^x for other nonprinting chars

---

adb shell screenrecord --help

Usage: screenrecord [options]

Android screenrecord v1.3.  Records the device's display to a .mp4 file.

Options:

--size WIDTHxHEIGHT

    Set the video size, e.g. "1280x720".  Default is the device's main

    display resolution (if supported), 1280x720 if not.  For best results,

    use a size supported by the AVC encoder.

--bit-rate RATE

    Set the video bit rate, in bits per second.  Value may be specified as

    bits or megabits, e.g. '4000000' is equivalent to '4M'.  Default 20Mbps.

--bugreport

    Add additional information, such as a timestamp overlay, that is helpful

    in videos captured to illustrate bugs.

--time-limit TIME

    Set the maximum recording time, in seconds.  Default / maximum is 180.

--display-id ID

    specify the physical display ID to record. Default is the primary display.

    see "dumpsys SurfaceFlinger --display-id" for valid display IDs.

--verbose

    Display interesting information on stdout.

--help

    Show this message.

Recording continues until Ctrl-C is hit or the time limit is reached.