bash: add page

pages/common/bash.md

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+# bash
+
+> Bourne-Again SHell
+> `sh`-compatible command line interpreter.
+
+- Start interactive command line interpreter
+
+`bash`
+
+- Execute command passed as parameter
+
+`bash -c {{command}}`
+
+- Run commands from file (script)
+
+`bash {{file}}`
+
+- Run commands from file and print them as they are executed
+
+`bash -x {{file}}`