07-31-2018
Quote:
Originally Posted by
Don Cragun
At times when your fuser command returns more than one PID, what are the processes with those PIDs? And what are the children of those PIDs doing?
From what you have said so far, it seems as though there might be two (or more) processes running on your system at some points in time that are accessing that file. You have not suggested any way to determine which parent you want when multiple parents meet your search criteria.
We are running the iPlanet server process in "Multi-Process Mode" where the server spawns new processes depending upon the situation.
I would never know which is the parent process and that was the purpose of this thread ... to determine the parent process of iPlanet.
You can understand and read more about why and how multiple processes are spawned by the iPlanet server by
clicking here.
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LEARN ABOUT LINUX
pstree.x11
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] [-g] --show-pgids] [-l, --long]
[-n, --numeric-sort] [-N, --ns-sortns [-p, --show-pids] [-s, --show-parents] [-S, --ns-changes] [-t, --thread-names] [-T, --hide-threads]
[-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.
Certain kernel or mount parameters, such as the hidepid option for procfs, will hide information for some processes. In these situations
pstree will attempt to build the tree without this information, showing process names as question marks.
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
current 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.
-g Show PGIDs. Process Group IDs are shown as decimal numbers in parentheses after each process name. -g implicitly disables com-
paction. If both PIDs and PGIDs are displayed then PIDs are shown first.
-l Display long lines. By default, lines are truncated to either the COLUMNS environment variable or the display width. If neither of
these methods work, the default of 132 columns is used.
-n Sort processes with the same ancestor by PID instead of by name. (Numeric sort.)
-N Show individual trees for each namespace of the type specified. The available types are: ipc, mnt, net, pid, user, uts. Regular
users don't have access to other users' processes information, so the output will be limited.
-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.
-S Show namespaces transitions. Like -N, the output is limited when running as a regular user.
-t Show full names for threads when available.
-T Hide threads and only show processes.
-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 compiled with SELinux support.
FILES
/proc location of the proc file system
BUGS
Some character sets may be incompatible with the VT100 characters.
SEE ALSO
ps(1), top(1).
psmisc 2016-06-18 PSTREE(1)