sh_flowinfo.d - snoop Bourne shell flow with additional info. sh_flowinfo.d This traces shell activity from all Bourne shells on the system that are running with sh provider support. This watches shell function entries and returns, and indents child function calls. Shell builtins and external commands are also printed. Any Evolving - uses the DTrace Shell provider, which may change as additional features are introduced. Check Shell/Readme to see what version these scripts are based on.

Default output, # sh_flowinfo.d

C CPU-id

PID Process ID

DELTA(us) Elapsed time from previous line to this line

FILE Filename of the shell script

LINE Line number of filename

TYPE Type of call (func/builtin/cmd/subsh)

NAME Shell function, builtin or command name

Watch the first column carefully, it prints the CPU-id. If it changes, then it is very likely that the output has been shuffled.

See the DTraceToolkit for further documentation under the Examples, Notes and Docs directories. The example files may be especially useful as they aim to demonstrate how to interpret the output. sh_flowinfo.d will run until Ctrl-C is hit. Brendan Gregg [CA, USA] dtrace(1M)