brctl: add page; id, history, kill: add examples; kill: fix a typo

pages/common/history.md

@@ -13,3 +13,7 @@
 - Overwrite history file with history of current `bash` shell (often combined with `history -c` to purge history):
 
 `history -w`
+
+- Delete the history entry at the specified offset:
+
+`history -d {{offset}}`

pages/common/id.md

@@ -2,10 +2,18 @@
 
 > Display current user and group identity.
 
+- Display current user's id (UID), group id (GID) and groups to which they belong:
+
+`id`
+
 - Display the current user identity as a number:
 
 `id -u`
 
 - Display the current group identity as a number:
 
 `id -g`
+
+- Display an arbitrary user's id (UID), group id (GID) and groups to which they belong:
+
+`id {{username}}`

pages/common/kill.md

@@ -23,6 +23,10 @@
 
 `kill -{{9|KILL}} {{process_id}}`
 
-- Signal the operating system to pause a program, it until a SIGCONT ("continue") signal is received:
+- Signal the operating system to pause a program until a SIGCONT ("continue") signal is received:
 
 `kill -{{17|STOP}} {{process_id}}`
+
+- Send a `SIGUSR1` signal to all processes with the given GID (group id):
+
+`kill -{{SIGUSR1}} -{{group_id}}`

pages/linux/brctl.md

@@ -0,0 +1,23 @@
+# brctl
+
+> Ethernet bridge administration.
+
+- Show a list with information about currently existing ethernet bridges:
+
+`sudo brctl show`
+
+- Create a new ethernet bridge interface:
+
+`sudo brctl add {{bridge_name}}`
+
+- Delete an existing ethernet bridge interface:
+
+`sudo brctl del {{bridge_name}}`
+
+- Add an interface to an existing bridge:
+
+`sudo brctl addif {{bridge_name}} {{interface_name}}`
+
+- Remove an interface from an existing bridge:
+
+`sudo brctl delif {{bridge_name}} {{interface_name}}`