70 lines
2.0 KiB
Markdown
70 lines
2.0 KiB
Markdown
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# The `pstree` command
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The `pstree` command is similar to `ps`, but instead of listing the running processes, it shows them as a tree. The tree-like format is sometimes more suitable way to display the processes hierarchy which is a much simpler way to visualize running processes. The root of the tree is either init or the process with the given pid.
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### Examples
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1. To display a hierarchical tree structure of all running processes:
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```
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pstree
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```
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2. To display a tree with the given process as the root of the tree:
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```
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pstree [pid]
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```
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3. To show only those processes that have been started by a user:
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```
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pstree [USER]
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```
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4. To show the parent processes of the given process:
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```
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pstree -s [PID]
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```
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5. To view the output one page at a time, pipe it to the `less` command:
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```
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pstree | less
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```
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### Syntax
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`ps [OPTIONS] [USER or PID]`
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### Additional Flags and their Functionalities
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|**Short Flag** |**Long Flag** |**Description** |
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|:---|:---|:---|
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|`-a`|`--arguments`|Show command line arguments|
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|`-A`|`--ascii`|use ASCII line drawing characters|
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|`-c`|`--compact`|Don't compact identical subtrees|
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|`-h`|`--highlight-all`|Highlight current process and its ancestors|
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|`-H PID`|`--highlight-pid=PID`|highlight this process and its ancestors|
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|`-g`|`--show-pgids`|show process group ids; implies `-c`|
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|`-G`|`--vt100`|use VT100 line drawing characters|
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|`-l`|`--long`|Don't truncate long lines|
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|`-n`|`--numeric-sort`|Sort output by PID|
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|`-N type`|`--ns-sort=type`|Sort by namespace type (cgroup, ipc, mnt, net, pid, user, uts)|
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|`-p`|`--show-pids`|show PIDs; implies -c|
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|`-s`|`--show-parents`|Show parents of the selected process|
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|`-S`|`--ns-changes`|show namespace transitions|
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|`-t`|`--thread-names`|Show full thread names|
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|`-T`|`--hide-threads`|Hide threads, show only processes|
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|`-u`|`--uid-changes`|Show uid transitions|
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|`-U`|`--unicode`|Use UTF-8 (Unicode) line drawing characters|
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|`-V`|`--version`|Display version information|
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|`-Z`|`--security-context`|Show SELinux security contexts|
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