fix(pkill): use the correct command flag

knowledge base/gitlab/runner.md

@@ -45,7 +45,7 @@ gitlab-runner exec docker \
 
 # Force a configuration file reload.
 sudo kill -HUP $(pidof 'gitlab-runner')
-sudo pkill --signal 'SIGHUP' 'gitlab-runner'
+sudo pkill -HUP 'gitlab-runner'
 ```
 
 </details>

knowledge base/logstash.md

@@ -52,7 +52,7 @@ logstash … --config.reload.automatic --config.reload.interval '5s'
 # Force configuration files reload and restart the pipelines.
 # Does not really seem to work, honestly. Just restart the whole service.
 kill -SIGHUP '14175'
-pkill --signal 'SIGHUP' 'logstash'
+pkill -HUP 'logstash'
 
 
 # Install plugins.

knowledge base/prometheus/README.md

@@ -79,12 +79,12 @@ docker run --rm -v "$PWD/config.yaml:/etc/prometheus/prometheus.yml:ro" --entryp
 
 # Reload the configuration file *without* restarting the process.
 kill -s 'SIGHUP' '3969'
-pkill --signal 'HUP' 'prometheus'
+pkill -HUP 'prometheus'
 curl -i -X 'POST' 'localhost:9090/-/reload'  # if admin APIs are enabled
 
 # Shut down the process *gracefully*.
 kill -s 'SIGTERM' '3969'
-pkill --signal 'TERM' 'prometheus'
+pkill -TERM 'prometheus'
 
 # Push test metrics to a remote.
 promtool push metrics 'http://mimir.example.org:8080/api/v1/push'
@@ -203,7 +203,7 @@ Prometheus can reload the configuration file with**out** restarting its process
 
   ```sh
   kill -s 'SIGHUP' '3969'
-  pkill --signal 'HUP' 'prometheus'
+  pkill -HUP 'prometheus'
   ```
 
 - Sending a `POST` HTTP request to the `/-/reload` endpoint.<br/>

snippets/process management.sh

@@ -19,5 +19,5 @@ kill -KILL '1234'
 kill -SIGKILL '1234'
 kill -s 'SIGHUP' '3969'
 pkill -KILL 'firefox'
-pkill --signal 'HUP' 'prometheus'
+pkill -HUP 'prometheus'
 killall -s 'SIGKILL' 'firefox-bin'