How to get available/free sdcard space in android with adb command

Use df, as with any Linux distro. Not all Android devices may have it, but it usually seems to be available.

1. df: Disk space details.

   adb shell df

2. du: Disk space used by the specified files and subdirectories.

   adb shell du

3. df -h: Disk space details in KB/MB format.

   adb shell df -h

4. du -h: Disk space used by the specified files and subdirectories in KB/MB format.

   adb shell du -h

5. For specific folder desk space details.

   adb shell df /system

6. For specific folder and sub-directories desk space details

   adb shell du /system