PS Command Builder - Interactive Linux Process Monitor Tool
Meta Information
Title Tag: PS Command Builder | Interactive Linux Process Status Generator Meta Description: Build ps commands visually with our interactive generator. Monitor processes, sort by CPU/memory, filter by user, and customize output formats without memorizing syntax. Free Linux tool. Keywords: ps command generator, ps aux explained, linux process monitor, ps command builder, process status tool, sort processes by cpu, sort processes by memory, linux pid finder
Structured Data (JSON-LD)
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"name": "PS Command Builder",
"description": "Interactive visual builder for Linux ps process monitoring commands",
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"operatingSystem": "Linux, macOS, Unix",
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"featureList": [
"Visual ps command generation",
"Process filtering by user/PID/command",
"CPU and memory sorting options",
"Custom output column formatting",
"Process tree/hierarchy views",
"Process state code reference"
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}Main Content
What is the PS Command?
The ps (process status) command displays information about currently running processes on Linux and Unix-like systems [^20^]. It provides a static snapshot of processes at the moment the command executes, unlike interactive monitors like top [^18^].
Common Use Cases:
- Identify process IDs (PIDs) for management tasks
- Monitor CPU and memory usage by process
- Find specific processes by name or user
- Display process hierarchies and parent-child relationships
- Troubleshoot system performance issues
- Generate reports for system administration
Why Use This PS Command Builder?
Building ps commands requires understanding complex option combinations. Our visual builder helps you:
- ✅ Generate commands without syntax errors
- ✅ Understand BSD vs POSIX option styles
- ✅ Copy production-ready commands instantly
- ✅ Learn process monitoring through interactive examples
Core Features
1. Process Selection Filters
Control which processes appear in output:
- All processes (-e/-A): Show every process on the system [^20^]
- By user (-u): Filter processes by specific username [^20^]
- By PID (-p): Select specific process IDs [^21^]
- By command (-C): Find processes by executable name [^20^]
- By terminal (-t): Show processes attached to specific TTY [^21^]
2. Output Format Control
Customize how process information displays:
- Full format (-f): Show detailed process information including PPID [^20^]
- Long format (-l): Display scheduler and priority details [^21^]
- User-oriented (u): Show CPU/memory percentages [^21^]
- Custom columns (-o): Select specific output fields [^18^]
- Forest view (--forest): Display process hierarchy as ASCII tree [^20^]
3. Sorting Options
Organize output by resource usage:
- By CPU (--sort=-%cpu): Show highest CPU consumers first [^18^]
- By memory (--sort=-%mem): Display highest memory usage first [^18^]
- By PID (--sort=pid): Order by process ID [^21^]
- By time (--sort=start_time): Sort by process start time [^19^]
4. Process State Reference
Understand process states in output:
- R (Running): Currently executing or in run queue
- S (Sleeping): Waiting for an event to complete
- D (Disk sleep): Uninterruptible sleep, usually IO
- Z (Zombie): Terminated but not reaped by parent [^18^]
- T (Stopped): Suspended by job control signal
Common PS Command Patterns
Basic Process Monitoring
# Show all processes (BSD style)
ps aux
# Show all processes (POSIX style)
ps -ef
# Show your current terminal processes
ps
# Show detailed process info with extra columns
ps -eFResource Usage Analysis
# Sort by CPU usage (highest first)
ps aux --sort=-%cpu | head -10
# Sort by memory usage
ps aux --sort=-%mem | head -10
# Show processes consuming >50% CPU
ps aux | awk '$3 > 50 {print $0}'
# Display memory details for specific process
ps -p 1234 -o pid,rss,vsz,pmem,cmdProcess Filtering
# Find processes by name
ps -C nginx
# Show processes for specific user
ps -u username
# Show process by PID with full details
ps -fp 1234
# Find processes excluding specific pattern
ps aux | grep -v grep | grep python
# Show children of specific process
ps --ppid 1234Process Tree Views
# ASCII art process tree
ps axjf
# Forest view with custom columns
ps -ef --forest
# Show process hierarchy
ps -ejH
# Tree with specific info
ps -eo pid,ppid,cmd --forestCustom Output Formats
# Show specific columns only
ps -eo pid,ppid,user,cmd,%cpu,%mem
# Include start time and elapsed time
ps -eo pid,lstart,etime,cmd
# Show thread information
ps -eLf
# Security context (SELinux)
ps -eo pid,context,cmdUnderstanding PS Output Columns
Standard Columns (ps aux)
| Column | Description |
|---|---|
| USER | Username of process owner |
| PID | Process ID (unique identifier) |
| %CPU | CPU usage percentage |
| %MEM | Physical memory usage percentage |
| VSZ | Virtual memory size (KB) |
| RSS | Resident Set Size - actual RAM used (KB) |
| TTY | Terminal device (? = none) |
| STAT | Process state code (R, S, D, Z, T) |
| START | Process start time or date |
| TIME | Cumulative CPU time consumed |
| COMMAND | Command that started the process |
Full Format Columns (ps -ef)
| Column | Description |
|---|---|
| UID | User ID number |
| PID | Process ID |
| PPID | Parent Process ID |
| C | CPU utilization |
| STIME | Start time |
| TTY | Terminal |
| TIME | CPU time |
| CMD | Command with arguments |
PS Command Options Reference
Process Selection
| Option | Description |
|---|---|
| -e, -A | Select all processes |
| -a | Select all except session leaders |
| -d | Select all except session leaders |
| -N, --deselect | Negate selection |
| -C cmd | Select by command name [^20^] |
| -G group | Select by real group ID/name |
| -g group | Select by session or group ID |
| -p pid | Select by process ID [^21^] |
| --ppid pid | Select by parent PID |
| -s sid | Select by session ID |
| -t tty | Select by terminal |
| -U user | Select by real user ID |
| -u user | Select by effective user ID |
| x | Include processes without TTY |
Output Format
| Option | Description |
|---|---|
| -f | Full format listing |
| -F | Extra full format |
| -l | Long format |
| -j | Jobs format |
| u | User-oriented format |
| s | Signal format |
| v | Virtual memory format |
| -o format | User-defined format |
| -O format | Preloaded default + custom |
Output Modifiers
| Option | Description |
|---|---|
| --forest | ASCII art process tree |
| -H | Show process hierarchy |
| -w | Wide output |
| --no-headers | Suppress header line |
| --sort key | Sort by column [^18^] |
| c | Show true command name |
| e | Show environment variables |
Process State Codes Explained
Understanding the STAT column is crucial for troubleshooting [^18^]:
| State | Meaning | Description |
|---|---|---|
| R | Running | Currently executing or runnable |
| S | Sleeping | Interruptible sleep (waiting for event) |
| D | Disk sleep | Uninterruptible sleep (usually IO) |
| Z | Zombie | Terminated but parent hasn't reaped |
| T | Stopped | Suspended by signal or debugging |
| W | Paging | Swapped out (deprecated) |
| X | Dead | Should never be seen |
| < | High priority | Nice value < 0 |
| N | Low priority | Nice value > 0 |
| L | Locked pages | Has pages locked in memory |
| s | Session leader | Process is session leader |
| l | Multi-threaded | Multi-threaded process |
| + | Foreground | Running in foreground |
FAQ
What is the difference between ps aux and ps -ef?
Both list all processes but use different option styles. ps aux uses BSD style (no dashes) and shows CPU/memory percentages [^19^]. ps -ef uses POSIX style (with dashes) and includes the PPID column [^18^]. Choose one format consistently for scripting.
How do I sort ps output by CPU usage?
Use ps aux --sort=-%cpu to sort by CPU percentage in descending order (highest first). Remove the minus sign for ascending order [^18^].
How do I find the PID of a specific process?
Use ps -C processname to find by command name, or ps aux | grep pattern for partial matches. For known PIDs, use ps -p PID [^18^].
What does zombie process mean?
A zombie process (state Z) has terminated but its parent process hasn't read its exit status. Zombies consume minimal resources but indicate potential issues with parent processes [^18^].
Can I use ps inside Docker containers?
Yes, but ps only sees processes within the container's PID namespace. PID 1 in a container is your entrypoint, not the host init system. Install procps package if ps is missing [^18^].
How do I show process trees?
Use ps axjf or ps -ef --forest to display hierarchical parent-child relationships. This helps visualize process relationships and service dependencies [^20^].
How can I monitor processes continuously?
While ps shows a static snapshot, you can wrap it in a loop: watch -n 1 'ps aux --sort=-%cpu | head' or use top for interactive monitoring [^19^].
What is RSS vs VSZ in ps output?
RSS (Resident Set Size) is actual physical RAM used. VSZ (Virtual Memory Size) is the total virtual address space allocated, including swapped-out pages and shared libraries [^19^].
Technical Specifications
- Zero dependencies: Runs entirely in browser
- No backend required: Static hosting compatible
- Offline capable: Works without internet after initial load
- Privacy focused: No data leaves your browser
- Keyboard shortcuts: Full keyboard navigation support
Related Tools
- top Command Reference
- htop Interactive Monitor
- pgrep Process Finder
- pkill Process Killer
- kill Command Builder
- Systemctl Service Manager
Resources
- GNU PS Manual
- Linux man pages - ps(1) [^21^]
- DigitalOcean PS Command Guide [^18^]
- GeeksforGeeks PS Tutorial [^20^]
Last Updated: 2025 License: Free to use Platform: Web-based, works on all modern browsers