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To switch from the C interpreter to the command shell, simply type cmd at the prompt. These commands are generally case-sensitive and follow standard UNIX conventions. If you are unsure whether a particular function is available in your image, use the help command to list all supported functions. Additionally, VxWorks supports command history—using the h command can increase the history buffer size from the default 20 entries up to 500 or more for deeper debugging.
: Change Directory . Changes the current working directory.
iosOpen / iosClose / iosRead / iosWrite — Low-level device I/O functions available in the API and often used via driver utilities.
These commands are used for interacting with file systems, drivers, and device handles. : List all devices known to the target. pwd : Print working directory. cd "dir" : Change current directory. ls : List files in the current directory. iosDevShow : Show loaded I/O devices. iosDrvShow : Show I/O device driver table. iosFdShow : Show open File Descriptors. 5. Modules, Networking, and Shell Control
: Delay . Delays the calling task for a specified number of system ticks. 2. Memory and System Debugging
| Command | Description | |---------|-------------| | memShow | Show system memory usage (total, free, allocated) | | m <address> | Display memory contents (hex & ASCII) | | d <address> | Display memory as bytes | | l <address> | Display memory as longs | | mfill <addr> <len> <value> | Fill memory with a value | | mcopy <src> <dst> <len> | Copy memory region | | checkStack <taskId> | Check task stack usage |
– Displays what resource a specific task is waiting for (e.g., semaphore, delay). Memory Analysis & Management
VxWorks is a deterministic real-time operating system (RTOS) used in everything from aerospace systems to networking hardware. Because it follows a "C-like" syntax in its shell, managing tasks and debugging memory can feel both powerful and precise. This guide serves as a comprehensive for the Kernel Shell (C interpreter) and the newer Command Shell . Core Syntax and Shell Basics
m [address] : Allows you to manually modify memory at a specified hex address. printErrno [n] : Describes the most recent error status; use for the latest status.
: Displays current memory partition and allocation statistics. h : Shows the command history. Memory & Debugging
Shows detailed block-level statistics for specific memory partitions.
| Category | Key Commands | | --- | --- | | | i (info), sp (spawn), ts / tr (suspend/resume), td (delete) | | Debugging | lkup (symbol lookup), d (display memory), l (disassemble), memShow | | Networking | ifconfig , ping , hostAdd , routeAdd , netShow | | File System | ls , cd , pwd , cat , cp , mv , rm , chmod | | Shell | help , h (history), cmd (switch to command interpreter), C (switch to C interpreter) |
Displays a summary of system memory. It provides the total allocated memory, free memory blocks, and the largest contiguous free block available. memShow Modern Shell ( cmd ) Syntax: show memory Core Memory Optimization Commands
If a task enters a "PEND" state permanently, it is likely waiting on a semaphore or resource that hasn't been released. 3. Network Configuration and Diagnostics
: The WindSh supports tab completion for function names and task names.
Displays all configured network interfaces, IP addresses, and packet counts. inetstatShow() inetstatShow
To switch from the C interpreter to the command shell, simply type cmd at the prompt. These commands are generally case-sensitive and follow standard UNIX conventions. If you are unsure whether a particular function is available in your image, use the help command to list all supported functions. Additionally, VxWorks supports command history—using the h command can increase the history buffer size from the default 20 entries up to 500 or more for deeper debugging.
: Change Directory . Changes the current working directory.
iosOpen / iosClose / iosRead / iosWrite — Low-level device I/O functions available in the API and often used via driver utilities.
These commands are used for interacting with file systems, drivers, and device handles. : List all devices known to the target. pwd : Print working directory. cd "dir" : Change current directory. ls : List files in the current directory. iosDevShow : Show loaded I/O devices. iosDrvShow : Show I/O device driver table. iosFdShow : Show open File Descriptors. 5. Modules, Networking, and Shell Control
: Delay . Delays the calling task for a specified number of system ticks. 2. Memory and System Debugging vxworks command cheat sheet
| Command | Description | |---------|-------------| | memShow | Show system memory usage (total, free, allocated) | | m <address> | Display memory contents (hex & ASCII) | | d <address> | Display memory as bytes | | l <address> | Display memory as longs | | mfill <addr> <len> <value> | Fill memory with a value | | mcopy <src> <dst> <len> | Copy memory region | | checkStack <taskId> | Check task stack usage |
– Displays what resource a specific task is waiting for (e.g., semaphore, delay). Memory Analysis & Management
VxWorks is a deterministic real-time operating system (RTOS) used in everything from aerospace systems to networking hardware. Because it follows a "C-like" syntax in its shell, managing tasks and debugging memory can feel both powerful and precise. This guide serves as a comprehensive for the Kernel Shell (C interpreter) and the newer Command Shell . Core Syntax and Shell Basics
m [address] : Allows you to manually modify memory at a specified hex address. printErrno [n] : Describes the most recent error status; use for the latest status. To switch from the C interpreter to the
: Displays current memory partition and allocation statistics. h : Shows the command history. Memory & Debugging
Shows detailed block-level statistics for specific memory partitions.
| Category | Key Commands | | --- | --- | | | i (info), sp (spawn), ts / tr (suspend/resume), td (delete) | | Debugging | lkup (symbol lookup), d (display memory), l (disassemble), memShow | | Networking | ifconfig , ping , hostAdd , routeAdd , netShow | | File System | ls , cd , pwd , cat , cp , mv , rm , chmod | | Shell | help , h (history), cmd (switch to command interpreter), C (switch to C interpreter) |
Displays a summary of system memory. It provides the total allocated memory, free memory blocks, and the largest contiguous free block available. memShow Modern Shell ( cmd ) Syntax: show memory Core Memory Optimization Commands iosOpen / iosClose / iosRead / iosWrite —
If a task enters a "PEND" state permanently, it is likely waiting on a semaphore or resource that hasn't been released. 3. Network Configuration and Diagnostics
: The WindSh supports tab completion for function names and task names.
Displays all configured network interfaces, IP addresses, and packet counts. inetstatShow() inetstatShow
