02-12-2011
ps has options which can display the output of processes (and child processes) in tree hierarchy.
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Unix (and Linux) uses a process tree that gives a natural security, by simple inheritance of attributes.
The following ptree script shows it. It runs on all Linux flavors.
Mostly useful for debugging.
#!/bin/sh
# Solaris style ptree
&& exec /usr/bin/ptree "$@"
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ptree(1) General Commands Manual ptree(1)
NAME
ptree - prints the process tree hierarchy
SYNOPSIS
[pid1|username1 [pid2|username2]...]
DESCRIPTION
prints the process tree of all processes that match the specified arguments. While printing the tree, the child processes are indented to
the right from their respective parent processes.
Options
Prints the tree starting from the children of
(usually pid 0). The default is to print the tree starting from the children of (pid 1).
Operands
pid Print the process tree for the process ID number specified by pid.
username Print the process tree for all the processes from the user specified by username. Note that only username (and not user ID) can
be specified for this instance.
If no operands are specified, then prints the process tree of all processes starting from the children of or (if is specified).
EXTERNAL INFLUENCES
Environment Variables
If is not specified or is null, it defaults to (see lang(5)).
EXAMPLES
Print the process tree for pid 100 and for all processes owned by
WARNINGS
Process information can change while is running; the tree displayed by is only a snapshot in time. Some data printed for defunct processes
is irrelevant.
Users of must not rely on the exact field widths and spacing of its output, as these will vary depending on the system and the release of
HP-UX.
SEE ALSO
pgrep(1), pkill(1), ps(1), fork(2).
ptree(1)