Update cheatsheets

pamfunc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamfunc
+
+> Apply a simple arithmetic function to a Netpbm image.
+> More information: <https://netpbm.sourceforge.net/doc/pamfunc.html>.
+
+- Apply the specified arithmetic function with `n` as the second argument to each sample in the specified PAM image:
+
+`pamfunc -{{multiplier|divisor|adder|subtractor|min|max}} {{n}} {{path/to/input.pam}} > {{path/to/output.pam}}`
+
+- Apply the specified bit string function with `n` as the second argument to each sample in the specified PAM image:
+
+`pamfunc -{{andmask|ormask|xormask|shiftleft|shiftright}} {{n}} {{path/to/input.pam}} > {{path/to/output.pam}}`