Index: trunk/ippTools/src/detselect.c
===================================================================
--- trunk/ippTools/src/detselect.c	(revision 36529)
+++ trunk/ippTools/src/detselect.c	(revision 36543)
@@ -29,4 +29,6 @@
 static bool searchMode(pxConfig *config);
 static bool selectMode(pxConfig *config);
+static bool showMode(pxConfig *config);
+
 
 # define MODECASE(caseName, func) \
@@ -50,4 +52,5 @@
         MODECASE(DETSELECT_MODE_SEARCH,        searchMode);
         MODECASE(DETSELECT_MODE_SELECT,        selectMode);
+	MODECASE(DETSELECT_MODE_SHOW,          showMode);
         default:
             psAbort("invalid option (this should not happen)");
@@ -241,2 +244,64 @@
     return true;
 }
+
+static bool showMode(pxConfig *config)
+{
+    PS_ASSERT_PTR_NON_NULL(config, false);
+
+    PXOPT_LOOKUP_BOOL(simple, config->args, "-simple", false);
+
+    psMetadata *where = psMetadataAlloc();
+
+    PXOPT_COPY_STR(config->args, where, "-inst",      "camera", "==");
+    PXOPT_COPY_STR(config->args, where, "-telescope", "telescope", "==");
+    PXOPT_COPY_STR(config->args, where, "-det_type",  "det_type", "==");
+    PXOPT_COPY_STR(config->args, where, "-type",      "det_type", "==");
+
+    psString query = pxDataGet("detselect_show.sql");
+    if (!query) {
+        psError(PXTOOLS_ERR_SYS, false, "failed to retreive SQL statement");
+        return false;
+    }
+
+    // use psDBGenerateWhereConditionalSQL with AND ... because the SQL ends in a WHERE
+    if (where && psListLength(where->list)) {
+        psString whereClause = psDBGenerateWhereConditionSQL(where, NULL);
+        psStringAppend(&query, " AND %s", whereClause);
+        psFree(whereClause);
+    }
+    psFree(where);
+
+    // we choose the single detrend image which matches all criteria and has
+    // the latest insertion date
+
+    psStringAppend(&query, " ORDER BY registered DESC, iteration DESC, time_begin, time_end");
+
+    if (!p_psDBRunQuery(config->dbh, query)) {
+        psError(PS_ERR_UNKNOWN, false, "database error");
+        psFree(query);
+        return false;
+    }
+    psFree(query);
+
+    psArray *output = p_psDBFetchResult(config->dbh);
+    if (!output) {
+        psError(PS_ERR_UNKNOWN, false, "database error");
+        return false;
+    }
+    if (!psArrayLength(output)) {
+        // XXX check psError here
+        psError(PS_ERR_UNKNOWN, false, "no detRun rows found");
+        psFree(output);
+        return true;
+    }
+
+    // negative simple so the default is true
+    if (!ippdbPrintMetadatas(stdout, output, "detRun", !simple)) {
+        psError(PS_ERR_UNKNOWN, false, "failed to print array");
+        psFree(output);
+        return false;
+    }
+
+    psFree(output);
+    return(true);
+}
Index: trunk/ippTools/src/detselect.h
===================================================================
--- trunk/ippTools/src/detselect.h	(revision 36529)
+++ trunk/ippTools/src/detselect.h	(revision 36543)
@@ -27,4 +27,5 @@
     DETSELECT_MODE_SEARCH,
     DETSELECT_MODE_SELECT,
+    DETSELECT_MODE_SHOW
 } detselectMode;
 
Index: trunk/ippTools/src/detselectConfig.c
===================================================================
--- trunk/ippTools/src/detselectConfig.c	(revision 36529)
+++ trunk/ippTools/src/detselectConfig.c	(revision 36543)
@@ -65,4 +65,12 @@
     psMetadataAddStr(selectArgs, PS_LIST_TAIL, "-class_id", 0,                     "search by class ID", NULL);
     psMetadataAddBool(selectArgs, PS_LIST_TAIL, "-simple",  0,                      "use the simple output format", false);
+
+    // -show
+    psMetadata *showArgs = psMetadataAlloc();
+    psMetadataAddStr(showArgs, PS_LIST_TAIL, "-inst",       0,       "search by camera", NULL);
+    psMetadataAddStr(showArgs, PS_LIST_TAIL, "-telescope",  0,       "search by telescope", NULL);
+    psMetadataAddStr(showArgs, PS_LIST_TAIL, "-det_type",   0,       "search by detrend type", NULL);
+    psMetadataAddStr(showArgs, PS_LIST_TAIL, "-type",       0,       "search by detrend type (alias for -det_type)", NULL);
+    psMetadataAddBool(showArgs, PS_LIST_TAIL, "-simple",     0,       "use the simple output format", false);
     
     psMetadata *argSets = psMetadataAlloc();
@@ -71,4 +79,5 @@
     PXOPT_ADD_MODE("-search",  "search for an appropriate detrend", DETSELECT_MODE_SEARCH, searchArgs);
     PXOPT_ADD_MODE("-select",  "retreive detrend information", DETSELECT_MODE_SELECT, selectArgs);
+    PXOPT_ADD_MODE("-show",    "show all active detrends of this type with constraints", DETSELECT_MODE_SHOW, showArgs);
 
     if (!pxGetOptions(stderr, argc, argv, config, modes, argSets)) {