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What will be the output of this command after enabling serial and rebooting?

medium📝 Predict Output Q5 of 15
Raspberry Pi - Serial UART Communication
What will be the output of this command after enabling serial and rebooting?
ls -l /dev/serial0
Alrwxrwxrwx 1 root root 7 Apr 1 12:00 /dev/serial0 -> ttyUSB0
Bcrw-rw---- 1 root dialout 204, 64 Apr 1 12:00 /dev/serial0
Clrwxrwxrwx 1 root root 7 Apr 1 12:00 /dev/serial0 -> ttyAMA0
DNo such file or directory
Step-by-Step Solution
Solution:

  1. Step 1: Understand /dev/serial0 as a symbolic link

    /dev/serial0 is a symlink to the actual UART device, usually ttyAMA0.

  2. Step 2: Interpret ls -l output for symlink

    The output shows a symbolic link pointing to ttyAMA0 with permissions and ownership.

  3. Final Answer:

    lrwxrwxrwx 1 root root 7 Apr 1 12:00 /dev/serial0 -> ttyAMA0 -> Option C

  4. Quick Check:

    ls -l /dev/serial0 shows symlink to ttyAMA0 [OK]
Quick Trick: Check /dev/serial0 with ls -l to see symlink target [OK]
Common Mistakes:
MISTAKES
  • Expecting /dev/serial0 to be a character device, not symlink
  • Assuming it points to ttyUSB0 (USB adapter)
  • Thinking the file does not exist after enabling serial

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