```r
library(org.Hs.eg.db)
keytypes(org.Hs.eg.db)
```

```
##  [1] "ENTREZID"     "PFAM"         "IPI"          "PROSITE"     
##  [5] "ACCNUM"       "ALIAS"        "CHR"          "CHRLOC"      
##  [9] "CHRLOCEND"    "ENZYME"       "MAP"          "PATH"        
## [13] "PMID"         "REFSEQ"       "SYMBOL"       "UNIGENE"     
## [17] "ENSEMBL"      "ENSEMBLPROT"  "ENSEMBLTRANS" "GENENAME"    
## [21] "UNIPROT"      "GO"           "EVIDENCE"     "ONTOLOGY"    
## [25] "GOALL"        "EVIDENCEALL"  "ONTOLOGYALL"  "OMIM"        
## [29] "UCSCKG"
```

```r
columns(org.Hs.eg.db)
```

```
##  [1] "ENTREZID"     "PFAM"         "IPI"          "PROSITE"     
##  [5] "ACCNUM"       "ALIAS"        "CHR"          "CHRLOC"      
##  [9] "CHRLOCEND"    "ENZYME"       "MAP"          "PATH"        
## [13] "PMID"         "REFSEQ"       "SYMBOL"       "UNIGENE"     
## [17] "ENSEMBL"      "ENSEMBLPROT"  "ENSEMBLTRANS" "GENENAME"    
## [21] "UNIPROT"      "GO"           "EVIDENCE"     "ONTOLOGY"    
## [25] "GOALL"        "EVIDENCEALL"  "ONTOLOGYALL"  "OMIM"        
## [29] "UCSCKG"
```

```r
cols <- c("SYMBOL", "GENENAME")
select(org.Hs.eg.db, keys=ensids, columns=cols, keytype="ENSEMBL")
```

```
##           ENSEMBL SYMBOL
## 1 ENSG00000130720 FIBCD1
## 2 ENSG00000103257 SLC7A5
## 3 ENSG00000156414  TDRD9
## 4 ENSG00000144644  GADL1
## 5 ENSG00000159307 SCUBE1
## 6 ENSG00000144485   HES6
##                                                                           GENENAME
## 1                                                 fibrinogen C domain containing 1
## 2 solute carrier family 7 (amino acid transporter light chain, L system), member 5
## 3                                                        tudor domain containing 9
## 4                                                   glutamate decarboxylase-like 1
## 5                                           signal peptide, CUB domain, EGF-like 1
## 6                                           hes family bHLH transcription factor 6
```