Update cheatsheets

trap

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# trap
+
+> Execute a command upon an event.
+> More information: <https://manned.org/trap.1posix>.
+
+- List the commands and the names of the expected events:
+
+`trap`
+
+- Execute a command when a signal is received:
+
+`trap 'echo "Caught signal {{SIGHUP}}"' {{HUP}}`
+
+- Remove commands:
+
+`trap - {{HUP}} {{INT}}`