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If the process is [[Linux_General_Concepts#Interruptible_Sleep_.28S.29|sleeping]], shows the kernel channel the process is waiting on. | If the process is [[Linux_General_Concepts#Interruptible_Sleep_.28S.29|sleeping]], shows the kernel channel the process is waiting on. | ||
==TTY== | |||
The TTY device, relative to /dev. | |||
Revision as of 00:27, 3 May 2018
Internal
Overview
ps gets its information from /proc/<pid>/stat files.
Options
-A, -e
Select all processes. -A and -e are identical.
-f
Full-format listing.
-L
Show threads.
The thread ID is listed under the "LWP" column.
--forest
Hierarchical display of the process tree.
--no-headers
Skips the display of the header line. Useful when counting lines in the ps output with wc -l.
-l
Displays the process state (S) and, if sleeping, what kernel channel it is waiting on (WCHAN).
Columns
PID
LWP
The thread ID.
NLWP
The number of threads for the process.
S
The process state.
WCHAN
If the process is sleeping, shows the kernel channel the process is waiting on.
TTY
The TTY device, relative to /dev.