Added # 11.

README.md

@@ -13,10 +13,10 @@ It's mostly distro-agnostic but sometimes specific for [pacman-based distros](ht
   
 ### 1. Automatic clear cache.  
 - Description: Automatically move files older than a specific amount of time from your user's `~/.cache` directory to the trash.  
-- Requires: The [rmtrash](https://github.com/PhrozenByte/rmtrash) package.  
-- How-to: Add the following line to your crontab using the command "crontab -e" (or EDITOR=$editor crontab -e).  
-    - `0 17 * * * /usr/bin/find ~/.cache/* -mtime +7 -exec /usr/bin/rmtrash -rf {} \;`  
-    - This command looks at files in `~/.cache` every day at 5 p.m. and moves files older than 7 days to the trash.  
+- Requires: The [rmtrash](https://github.com/PhrozenByte/rmtrash) package and [anacron](https://www.youtube.com/watch?v=41Lay6ZPtRQ).  
+- How-to: Add the following line to `/etc/cron.daily/cache`.  
+    - `find ~/.cache/* -mtime +7 -exec rmtrash -rf {} \;`  
+    - This will move files older than 7 days in `~/.cache` to the trash every day.  
 - Additionally: This can also be done using regular `rm` instead of `rmtrash`.  
   
 ### 2. Limit systemd journal size.  
@@ -73,10 +73,10 @@ It's mostly distro-agnostic but sometimes specific for [pacman-based distros](ht
   
 ### 9. Automatic clean orphaned packages.  
 - Description: Automatically remove orphaned packages.  
-- Requires: A pacman-based distribution.  
-- How-to: Add the following line to your crontab.  
-    - `0 20 * * * /usr/bin/pacman -Qtdq | /usr/bin/pacman -Rns -`  
-- Additionally: This example removes orphans everyday at 8 p. m. but the   
+- Requires: A pacman-based distribution and anacron.  
+- How-to: Add the following line to `/etc/cron.daily/orph`.  
+    - `pacman -Qtdq | pacman -Rns -`  
+- Additionally:  
   
 ### 10. Automatic retrieve latest mirrors.
 - Description: Automatically retrieve the latest Arch Linux mirrors and write them to the mirrorlist.  
@@ -84,3 +84,15 @@ It's mostly distro-agnostic but sometimes specific for [pacman-based distros](ht
 - How-to: Install reflector and enable the reflector.timer.  
     - `# systemctl enable reflector.timer`  
 - Additionally: [ArchWiki: Reflector](https://wiki.archlinux.org/title/Reflector#systemd_timer).  
+  
+### 11. Extract text containing keywords from any file.
+- Description: This command will filter and sort text based on keyword from any file(s).  
+- Requires: [GNU Coreutils](https://www.gnu.org/software/coreutils/), [GNU grep](https://www.gnu.org/software/grep/)  
+- How-to:  
+    - `cat ./*/files* | grep -e keyword1 -e keyword2 | sort -u | nl > file`
+    - `cat` will take any file(s), multiple files in multiple subdirectories can be specified.  
+    - `grep -e` will look for any and/or all specified keywords.
+    - `sort -u` will sort the results alphabetically and remove duplicates.  
+    - `nl` will add a number in front of every result (optionally).  
+    - `>` will write everything in a specified file.
+- Additionally: This is simply an example of how useful the coreutils can be, especially when used together.