How to find all the child processes of a parent process Post: 302280327

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LEARN ABOUT LINUX

pstree

PSTREE(1)							   User Commands							 PSTREE(1)

NAME

       pstree - display a tree of processes

SYNOPSIS

       pstree [-a|--arguments] [-c|--compact] [-h|--highlight-all|-Hpid|--highlight-pid pid] [-l|--long] [-n|--numeric-sort] [-p|--show-pids]
       [-s|--show-parents] [-u|--uid-changes] [-Z|--security-context] [-A|--ascii|-G|--vt100|-U|--unicode] [pid|user]
       pstree -V|--version

DESCRIPTION

       pstree shows running processes as a tree. The tree is rooted at either pid or init if pid is omitted. If a  user  name  is  specified,  all
       process trees rooted at processes owned by that user are shown.

       pstree visually merges identical branches by putting them in square brackets and prefixing them with the repetition count, e.g.

	   init-+-getty
		|-getty
		|-getty
		`-getty

       becomes

	   init---4*[getty]

       Child threads of a process are found under the parent process and are shown with the process name in curly braces, e.g.

	   icecast2---13*[{icecast2}]

       If  pstree  is  called as pstree.x11 then it will prompt the user at the end of the line to press return and will not return until that has
       happened. This is useful for when pstree is run in a xterminal.

OPTIONS

       -a     Show command line arguments. If the command line of a process is swapped out, that process is shown in  parentheses.  -a	implicitly
	      disables compaction for processes but not threads.

       -A     Use ASCII characters to draw the tree.

       -c     Disable compaction of identical subtrees. By default, subtrees are compacted whenever possible.

       -G     Use VT100 line drawing characters.

       -h     Highlight the current process and its ancestors. This is a no-op if the terminal doesn't support highlighting or if neither the cur-
	      rent process nor any of its ancestors are in the subtree being shown.

       -H     Like -h, but highlight the specified process instead. Unlike with -h, pstree fails when using -H if highlighting is not available.

       -l     Display long lines. By default, lines are truncated to the display width or 132 if output is sent to a non-tty  or  if  the  display
	      width is unknown.

       -n     Sort processes with the same ancestor by PID instead of by name. (Numeric sort.)

       -p     Show PIDs. PIDs are shown as decimal numbers in parentheses after each process name. -p implicitly disables compaction.

       -s     Show parent processes of the specified process.

       -u     Show  uid  transitions.  Whenever the uid of a process differs from the uid of its parent, the new uid is shown in parentheses after
	      the process name.

       -U     Use UTF-8 (Unicode) line drawing characters. Under Linux 1.1-54 and above, UTF-8 mode  is  entered  on  the  console  with  echo	-e
	      '33%8' and left with echo -e '33%@'

       -V     Display version information.

       -Z     (SELinux) Show security context for each process. This flag will only work if pstree is compilied with SELinux support.

FILES

       /proc	 location of the proc file system

AUTHORS

       Werner Almesberger <werner@almesberger.net> Craig Small <csmall@enc.com.au>

BUGS

       Some character sets may be incompatible with the VT100 characters.

SEE ALSO

       ps(1), top(1).

Linux								    2011-02-22								 PSTREE(1)

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

what are parent and child processes all about?

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[KSH/Bash] Starting a parent process from a child process?

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