update help for check_requirements

docs/20_Checks/check_requirements.md

@@ -6,13 +6,16 @@ Script: `check_requirements`
 
 * Check if a process exists
 * Check an open udp or tcp port (local or on given host/ ip)
+* Ping a target system (new in v1.3)
 
 You can insert a label to create multiple blocks.
 
 ## Requirements
 
-* `ps`
-* `top`
+* Linux GNU tools
+  * `ps`
+  * `top`
+  * `ping`
 
 ## Standalone installation
 
@@ -26,7 +29,7 @@ From this repository ypu need next to this script:
 ______________________________________________________________________
 
 CHECK_REQUIREMENTS
-v1.2
+v1.3
 
 (c) Institute for Medical Education - University of Bern
 Licence: GNU GPL 3
@@ -40,7 +43,7 @@ connections do exist.
 The check returns OK if all given requirements match.
 
 SYNTAX:
-check_requirements [-h] [-v] [PARAMETERS]
+check_requirements [-h] [PARAMETERS]
 
 OPTIONS:
 
@@ -56,6 +59,7 @@ PARAMETERS:
                          TYPE    string  one of tcp|udp
                          TARGET  string  target host
                          PORT    int     port number
+    -i|--ping TARGET     ping a target system
     -l|--label STRING    add label to divide the output in multiple sections
     -p|--process STRING  check if a process with given regex exists in the
                          output of 'ps aux'
@@ -83,7 +87,9 @@ check_requirements -l "webservice" -p httpd -t 80 -t 443 -l "database" -p mysqld
 
 ## Examples
 
-Check a webservice as process and 2 ports: ``check_requirements  -p nginx -t 443 -t 80``
+### 3 checks
+
+Check a locally rtunning webservice as process and 2 ports: ``check_requirements -p nginx -t 443 -t 80``
 
 ```txt
 OK: 3 Requirement checks - errors: 0
@@ -93,3 +99,48 @@ OK      process     nginx (2 x)
 OK      connection  tcp to localhost on port 443
 OK      connection  tcp to localhost on port 80
 ```
+
+### Verbose mode
+
+The verbose mode can be activated with `-v`. The checks are execeuted parameter by parameter. The debug begins where you add `-v` - so the best option is to add it at the beginning.
+
+This is the same list of checks again that you can compare both outputs: ``check_requirements -v -p nginx -t 443 -t 80``
+
+```txt
+OK: 3 Requirement checks - errors: 0
+
+STATUS  TYPE        RESULT
+OK      process     nginx (2 x)
+        > root        1211  0.0  0.0  16468  3436 ?        Ss   13:34   0:00 nginx: master process /usr/bin/nginx
+        > http        1212  0.0  0.0  16476  5188 ?        S    13:34   0:00 nginx: worker process
+
+OK      connection  tcp to localhost on port 443
+        > https             443/tcp
+
+OK      connection  tcp to localhost on port 80
+        > http               80/tcp
+        > www                80/tcp
+        > www-http           80/tcp
+```
+
+### Labels
+
+The `-l <TEXT>` parameter adds a label. With it you can visually group some checks.
+
+When executing this: `/check_requirements -l "webservice" -p nginx -t 443 -t 80 -l "network" -c tcp www.example.com 443` then we get 2 sections with a table of executed checks inside:
+
+```txt
+OK: 4 Requirement checks - errors: 0
+
+========== webservice
+
+STATUS  TYPE        RESULT
+OK      process     nginx (2 x)
+OK      connection  tcp to localhost on port 443
+OK      connection  tcp to localhost on port 80
+
+========== network
+
+STATUS  TYPE        RESULT
+OK      connection  tcp to www.example.com on port 443
+```