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# ps(1)
```
ps [opt]
opt:
--no-header .... do not print column header
-o <OUT> ....... comma separated list of output columns
-p <PID> ....... only show pid
-T ............. list threads
```
> Set `PS_FORMAT` env variable to setup default output columns.
Frequently used output columns
```
pid process id
pgid process group id
tid thread id
comm name of process
cmd name of process + args (full)
etime elapsed time (since process started)
user user owning process
pcpu cpu utilization (percent)
pmem physical resident set (rss) (percent)
rss physical memory (in kb)
vsz virtual memory (in kb)
```
## Example: Use output for scripting
```sh
for tid in $(ps -o tid --no-header -T -p 31084); do
taskset -c -p $tid;
done
```
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