automated terminal push

docs/Linux-Commands/Process-Management/033-the-ps-command.md

@@ -0,0 +1,54 @@
+# The `ps` command
+
+The `ps` command is used to identify programs and processes that are running on the system and the resources they are using. 
+Its frequently [pipelined](<https://en.wikipedia.org/wiki/Pipeline_(Unix)>) with other commands like `grep` to search for a program/process or `less` 
+so that the user can analyze the output one page at a time.
+
+Let's say you have a program like openshot which is notorious for hogging system resources when exporting a video, and you want to close it, but the GUI has become unresponsive.
+
+### Example
+
+1. You want to find the PID of openshot and kill it.
+
+```
+ps aux | grep openshot
+kill - <openshot PID>
+```
+
+2. To Show all the running processes:
+
+```
+ps -A
+```
+
+
+### Syntax
+
+`ps [options]`
+
+When run without any options, it's useless and will print: `CMD` - the executable processes/(program) running, their `PID` - process ID, `TTY` - terminal type and `Time` - How long the process has utilized the CPU or thread.
+
+### Common Option
+
+If you are going to remember only one thing from this page let it be these three letter `aux`:
+`a` - which displays all processes running, including those being run by other users.
+`u` - which shows the effective user of a process, i.e. the person whose file access permissions are used by the process.
+`x` - which shows processes that do not have a `TTY` associated with them.
+
+### Additional Options:
+
+|**Option**   |**Description**   |
+|:---|:---|
+|`a`|Shows list all processes with a terminal (tty)|
+|`-A`|Lists all processes. Identical to `-e`|
+|`-a`|Shows all processes except both session leaders and processes not associated with a terminal|
+|`-d`|Select all processes except session leaders|
+|`--deselect`|Shows all processes except those that fulfill the specified conditions. Identical to `-N`|
+|`-e`|Lists all processes. Identical to `-A`|
+|`-N`|Shows all processes except those that fulfill the specified conditions. Identical to `-deselect`|
+|`T`|Select all processes associated with this terminal. Identical to the `-t` option without any argument|
+|`r`|Restrict the selection to only running processes|
+|`--help simple`|Shows all the basic options|
+|`--help all`|Shows every available options|
+
+Another useful command which give a realtime snapshot of the processes and the resources they are using about every ten seconds is `top`.