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If pattern is specified, only languages whose names match the pattern are listed. By default, only user-created languages are shown; supply the S modifier to include system objects. If x is appended to the command name, the results are displayed in expanded mode. If + is appended to the command name, each language is listed with its call handler, validator, access privileges, and whether it is a system object.","BodyHTML":"\u003cdiv\u003e\u003cdl\u003e\u003cdt id=\"APP-PSQL-META-COMMAND-DL-UC\"\u003e\u003cspan\u003e\u003ccode\u003e\\dL[Sx+] [ \u003ca href=\"/docs/18/app-psql.html#APP-PSQL-PATTERNS\" title=\"Patterns\" rel=\"nofollow\"\u003e\u003cem\u003e\u003ccode\u003epattern\u003c/code\u003e\u003c/em\u003e\u003c/a\u003e ]\u003c/code\u003e\u003c/span\u003e \u003c/dt\u003e\u003cdd\u003e\u003cp\u003e\n        Lists procedural languages. 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