Update cheatsheets

tldr/ecpg

@@ -0,0 +1,37 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ecpg
+
+> Embedded SQL preprocessor for C programs.
+> More information: <https://www.postgresql.org/docs/current/app-ecpg.html>.
+
+- Preprocess a specific file:
+
+`ecpg {{input.pgc}}`
+
+- Preprocess from `stdin` and output to `stdout`:
+
+`ecpg -o - -`
+
+- Preprocess from `stdin` and write to a file:
+
+`cat input.pgc | ecpg -o output.c -`
+
+- Preprocess and specify an output file:
+
+`ecpg -o {{output.c}} {{input.pgc}}`
+
+- Preprocess a header file (`.pgh` extension):
+
+`ecpg {{input.pgh}}`
+
+- Preprocess in a specific compatibility mode:
+
+`ecpg -C {{INFORMIX|INFORMIX_SE|ORACLE}} {{input.pgc}}`
+
+- Preprocess with autocommit enabled:
+
+`ecpg -t {{input.pgc}}`