Update cheatsheets

linux/exec

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# exec
+
+> Execute a command without creating a child process.
+> More information: <https://www.gnu.org/software/bash/manual/bash.html#index-exec>.
+
+- Execute a specific command:
+
+`exec {{command -with -flags}}`
+
+- Execute a command with a (mostly) empty environment:
+
+`exec -c {{command -with -flags}}`
+
+- Execute a command as a login shell:
+
+`exec -l {{command -with -flags}}`
+
+- Execute a command with a different name:
+
+`exec -a {{name}} {{command -with -flags}}`