pnmsplit, pamsplit, pamexec, pampick: add pages (#12412)

pages/common/pamexec.md

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+# pamexec
+
+> Execute a shell command on each image in a Netpbm file.
+> See also: `pamfile`, `pampick`, `pamsplit`.
+> More information: <https://netpbm.sourceforge.net/doc/pamexec.html>.
+
+- Execute a shell command on each image in a Netpbm file:
+
+`pamexec {{command}} {{path/to/image.pam}}`
+
+- Stop processing if a command terminates with a nonzero exit status:
+
+`pamexec {{command}} {{path/to/image.pam}} -check`

pages/common/pampick.md

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+# pampick
+
+> Pick images out of a multi-image Netpbm stream.
+> See also: `pamfile`, `pamsplit`.
+> More information: <https://netpbm.sourceforge.net/doc/pampick.html>.
+
+- Execute a shell command on each image in a Netpbm file:
+
+`pampick {{image_number1 image_number2 ...}} < {{path/to/image.pam}} > {{path/to/output.pam}}`

pages/common/pamsplit.md

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+# 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}}`

pages/common/pnmsplit.md

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+# pnmsplit
+
+> This command is superseded by `pamsplit`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmsplit.html>.
+
+- View documentation for the current command:
+
+`tldr pamsplit`