Update cheatsheets

pamstack

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamstack
+
+> Stack the planes of multiple PAM images into one PAM image.
+> More information: <https://netpbm.sourceforge.net/doc/pamstack.html>.
+
+- Stack the planes of the specified PAM images in the specified order:
+
+`pamstack {{path/to/image1.pam path/to/image2.pam ...}} > {{path/to/output.pam}}`
+
+- Specify the tuple type name of the output PAM file (maximum of 255 characters):
+
+`pamstack -tupletype {{tuple_type}} {{path/to/image1.pam path/to/image2.pam ...}} > {{path/to/output.pam}}`