Update cheatsheets

linux/chkconfig

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# chkconfig
+
+> Manage the runlevel of services on CentOS 6.
+> More information: <https://manned.org/chkconfig>.
+
+- List services with runlevel:
+
+`chkconfig --list`
+
+- Show a service's runlevel:
+
+`chkconfig --list {{ntpd}}`
+
+- Enable service at boot:
+
+`chkconfig {{sshd}} on`
+
+- Enable service at boot for runlevels 2, 3, 4, and 5:
+
+`chkconfig --level {{2345}} {{sshd}} on`
+
+- Disable service at boot:
+
+`chkconfig {{ntpd}} off`
+
+- Disable service at boot for runlevel 3:
+
+`chkconfig --level {{3}} {{ntpd}} off`