---
name: "efilter"
section: "1"
platform: "linux"
package: "ncbi-entrez-direct"
version: "24.0.20250523+dfsg-1+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/efilter"
---

# efilter(1)

filter and/or sort NCBI Entrez search results

## NAME

efilter - filter and/or sort NCBI Entrez search results

## SYNOPSIS

**efilter** \[**-help**\] \[**-query** *str*\] \[**-days** *N*\] \[**-datetype** *field*\] \[**-mindate** *date*\] \[**-maxdate** *date*\] \[**-pub** *type*\] \[**-journal** *name*\] \[**-released** *when*\] \[**-country** *name*\] \[**-feature** *type*\] \[**-location** *type*\] \[**-molecule** *type*\] \[**-organism** *type*\] \[**-source** *type*\] \[**-division** *code*\] \[**-keyword purpose**\] \[**-purpose** *why*\] \[**-status alive**\] \[**-type** *type*\] \[**-class** *class*\]

## DESCRIPTION

**efilter** filters and/or sorts results from a previous Entrez Direct search.

## OPTIONS

### Query Specification

- **-query** *str*

  Limit results to those matching the given query string.

### Date Constraint

- **-days** *N*

  Keep only results from the past *N* days.

- **-datetype** *field*

  Which date field (in abbreviated form) to consider.

- **-mindate** *date*

  Start of date range.

- **-maxdate** *date*

  End of date range.

### Publication Filters

- **-pub** *type*

  **abstract**, **clinical**, **english**, **free**, **historical**, **journal**, **medline**, **preprint**, **published**, **retracted**, **retraction**, **review**, or **structured**.

- **-journal** *name*

  **pnas**, **"j bacteriol"**, ...

- **-released** *when*

  **last\_week**, **last\_month**, **last\_year**, or **prev\_years**.

### Sequence Filters

- **-country** *name*

  **usa:minnesota**, **united\_kingdom**, **"pacific ocean"**, ...

- **-feature** *type*

  **gene**, **mrna**, **cds**, **mat\_peptide**, ...

- **-location** *type*

  **mitochondrion**, **chloroplast**, **plasmid**, or **plastid**.

- **-molecule** *type*

  **genomic**, **mrna**, **trna**, **rrna**, or **ncrna**.

- **-organism** *type*

  **animals**, **archaea**, **bacteria**, **eukaryotes**, **fungi**, **human**, **insects**, **mammals**, **plants**, **prokaryotes**, **protists**, **rodents**, **viruses**, ...

- **-source** *type*

  **genbank**, **insd**, **pdb**, **pir**, **refseq**, **select**, **swissprot**, or **tpa.**

- **-division** *code*

  Three-letter GenBank division code: **bct**, **con**, **env**, **est**, **gss**, **htc**, **htg**, **inv**, **mam**, **pat**, **phg**, **pln**, **pri**, **rod**, **sts**, **syn**, **una**, **vrl**, or **vrt**.

- **-keyword purpose**

  - **-purpose** *why*

  **baseline** or **targeted.**

### Gene Filters

- **-status alive**

  - **-type** *type*

  **coding** or **pseudo**.

### SNP Filters

- **-class** *class*

  **acceptor**, **donor**, **coding**, **frameshift**, **indel**, **intron**, **missense**, **nonsense**, or **synonymous**.

### Assembly Filters

- **-status** *status*

  **latest** or **replaced**.

### Miscellaneous Arguments

- **-help**

  Print usage information.

## SEE ALSO

[**combine-uid-lists**(1)](/combine-uid-lists/1.md), [**difference-uid-lists**(1)](/difference-uid-lists/1.md), [**ecollect**(1)](/ecollect/1.md), [**elink**(1)](/elink/1.md), [**esearch**(1)](/esearch/1.md), [**exclude-uid-lists**(1)](/exclude-uid-lists/1.md), [**intersect-uid-lists**(1)](/intersect-uid-lists/1.md), [**nquire**(1)](/nquire/1.md), [**xfilter**(1)](/xfilter/1.md).