Update cheatsheets

tldr/pamsplit

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamsplit
+
+> Split a multi-image Netpbm file into multiple single-image Netpbm files.
+> See also: `pamfile`, `pampick`, `pamexec`.
+> More information: <https://netpbm.sourceforge.net/doc/pamsplit.html>.
+
+- Split a multi-image Netpbm file into multiple single-image Netpbm files:
+
+`pamsplit {{path/to/image.pam}}`
+
+- Specify a pattern for naming output files:
+
+`pamsplit {{path/to/image.pam}} {{file_%d.pam}}`