Use the -u switch of ps to limit ps scope to that of the current user.

Sergei Gerasenko · Sergei Gerasenko · commit fc73e092e5b4 · 2018-06-22T17:15:39.000Z
diff --git a/scripts/helpers.sh b/scripts/helpers.sh
@@ -27,8 +27,7 @@ all_tmux_processes() {
   # 1) `tmux source-file .tmux.conf` (used to reload tmux.conf)
   # 2) `tmux a` (which shows an additional process)
 
-  ps -Ao "command pid uid" |\
-    grep $UID |\
+  ps -u $UID -o "command pid uid" |\
     grep -E '^tmux' |\
     grep -vE '^tmux\s+(a|source)'
 }

Original file line number	Diff line number	Diff line change
`@@ -27,8 +27,7 @@ all_tmux_processes() {`
`27`	`27`	# 1) `tmux source-file .tmux.conf` (used to reload tmux.conf)
`28`	`28`	# 2) `tmux a` (which shows an additional process)
`29`	`29`
`30`		`- ps -Ao "command pid uid" \|\`
`31`		`- grep $UID \|\`
	`30`	`+ ps -u $UID -o "command pid uid" \|\`
`32`	`31`	`grep -E '^tmux' \|\`
`33`	`32`	`grep -vE '^tmux\s+(a\|source)'`
`34`	`33`	`}`