In addition to the comment you received, you could also use the "android" script located in the tools folder, here is the output on my machine (I have truncated the output):
[user@pc:~/sdk/tools]
└─ $ ▶ ./android list sdk
******************************************************************
The "android" command is deprecated.
For manual SDK, AVD, and project management, please use Android Studio.
For command-line tools, use tools/bin/sdkmanager and tools/bin/avdmanager
*********************************************************************
"android" SDK commands can be translated to sdkmanager commands on a
best-effort basis.
Continue? (This prompt can be suppressed with the --use-sdk-wrapper
command-line argument
or by setting the USE_SDK_WRAPPER environment variable) [y/N]: y
Running /home/user/sdk/tools/bin/sdkmanager --list --verbose
Info: Parsing /home/user/sdk/build-tools/24.0.3/package.xml
Info: Parsing /home/user/sdk/build-tools/25.0.2/package.xml
Info: Parsing /home/user/sdk/emulator/package.xml
Info: Parsing /home/user/sdk/patcher/v4/package.xml
...
Info: Parsing /home/user/sdk/tools/package.xml
Warning: File /home/user/.android/repositories.cfg could not be loaded.
Installed packages:
--------------------------------------
build-tools;24.0.3
Description: Android SDK Build-Tools 24.0.3
Version: 24.0.3
Installed Location: /home/user/sdk/build-tools/24.0.3
build-tools;25.0.2
Description: Android SDK Build-Tools 25.0.2
Version: 25.0.2
Installed Location: /home/user/sdk/build-tools/25.0.2
...
system-images;android-25;google_apis;x86_64
Description: Google APIs Intel x86 Atom_64 System Image
Version: 4
To make sure we are on the same page:
build-tools;24.0.3
build-tools/25.0.2
emulator | 26.0.0
platform-tools | 25.0.4
platforms;android-24 | 2
platforms;android-25 | 3
tools | 26.0.1
Edit: After reading the whole command output, it turns out that you could also use the --verbose flag:
[user@pc:~/sdk/tools]
└─ $ ▶ sdkmanager --list --verbose