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+# sponge
+
+> Soak up the input before writing the output file.
+> More information: <https://linux.die.net/man/1/sponge>.
+
+- Append file content to the source file:
+
+`cat {{path/to/file}} | sponge -a {{path/to/file}}`
+
+- Remove all lines starting with # in a file:
+
+`grep -v '^{{#}}' {{path/to/file}} | sponge {{path/to/file}}`