Update cheatsheets

tldr/chkrootkit

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# chkrootkit
+
+> Scan system for rootkits.
+> More information: <https://manned.org/chkrootkit>.
+
+- Enable [q]uiet mode and suppress normal test results:
+
+`chkrootkit -q`
+
+- Enable e[x]pert mode and produce additional outputs:
+
+`chkrootkit -x`
+
+- Enable [d]ebug mode to show all output:
+
+`chkrootkit -d`
+
+- Specify [e]xcluded files for some tests:
+
+`chkrootkit -e "{{path/to/file}}"`
+
+- Specify a directory as the [r]oot for testing (e.g. mounted `ext` drives):
+
+`chkrootkit -r {{path/to/directory}}`
+
+- Ignore [n]fs-mounted directories:
+
+`chkrootkit -n`
+
+- Invoke [T]ests and ignore specific filesystem types:
+
+`chkrootkit -T {{filesystemtype}}`
+
+- Generate [l]ist of available tests:
+
+`chkrootkit -l`