Update cheatsheets

tldr/linux/emaint

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# emaint
+
+> Perform Portage maintenance tasks.
+> More information: <https://wiki.gentoo.org/wiki/Portage#emaint>.
+
+- Synchronize repositories that are set to auto-sync (default for most repositories):
+
+`sudo emaint sync {{[-a|--auto]}}`
+
+- Synchronize a specific repository:
+
+`sudo emaint sync {{[-r|--repo]}} {{repository}}`
+
+- Clear the Portage resume list:
+
+`sudo emaint cleanresume {{[-f|--fix]}}`
+
+- Clean Portage logs:
+
+`sudo emaint logs {{[-C|--clean]}}`

tldr/linux/lvmsadc

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# lvmsadc
+
+> LVM system activity data collector (not supported under LVM2; prefer `dmstats`).
+> More information: <https://manned.org/lvmsadc>.
+
+- Run the collector (legacy LVM1 systems only):
+
+`lvmsadc`
+
+- Report I/O statistics using the device-mapper replacement:
+
+`dmstats report {{/dev/mapper/device}}`

tldr/linux/postfix

@@ -7,7 +7,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 > Postfix mail transfer agent (MTA) control program.
 > See also: `dovecot`, a mail delivery agent (MDA) that integrates with Postfix.
-> More information: <https://www.postfix.org>.
+> More information: <https://www.postfix.org/postfix.1.html>.
 
 - Check the configuration:
 

tldr/linux/systemctl-cancel

@@ -22,4 +22,4 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Cancel a job in the user service manager:
 
-`systemctl --user cancel {{job_id}}`
+`systemctl cancel --user {{job_id}}`

tldr/linux/systemctl-disable

@@ -14,7 +14,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Stop a service from running on boot and stop its current execution:
 
-`systemctl disable {{unit}} --now`
+`systemctl disable --now {{unit}}`
 
 - Stop a user service from running on login:
 

tldr/linux/systemctl-enable

@@ -14,7 +14,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Enable a service to run on boot and start it now:
 
-`systemctl enable {{unit}} --now`
+`systemctl enable --now {{unit}}`
 
 - Enable a user unit to run on login:
 

tldr/linux/systemctl-mask

@@ -14,7 +14,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Ensure that the service is shut down while masking:
 
-`systemctl mask {{service_name}} --now`
+`systemctl mask --now {{service_name}}`
 
 - Mask a user service:
 

tldr/linux/systemctl-unmask

@@ -15,7 +15,7 @@ source: https://github.com/tldr-pages/tldr.git
 
 - Unmask and start a service immediately:
 
-`systemctl unmask {{service_name}} --now`
+`systemctl unmask --now {{service_name}}`
 
 - Unmask a user service: