---
name: "existDB"
section: "1"
platform: "linux"
package: "meryl"
version: "0~20150903+r2013-9+b1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/existDB"
---

# existDB(1)

management of existDB files

## NAME

existDB - management of existDB files

## SYNOPSIS

**existDB** \[**-mersize** *mersize*\] **-build** *some.fasta* *prefix*

**existDB** **-describe** *prefix*

**existDB** **-testfiles** *some.fasta* *prefix*

**existDB** **-testexistence** *some.fasta*

**existDB** **-testexhaustive** *some.fasta* *some.meryl*

## DESCRIPTION

This program is part of libkmer.

## OPTIONS

- **-mersize** *mersize*

  Use the specified *mersize* when building **existDB** tables.

- **-build** *some.fasta* *prefix*

  Build an **existDB** on all mers in *some.fasta* and save the tables into *prefix*.

- **-describe** *prefix*

  Reports the state of some **existDB** file.

- **-testfiles** *some.fasta* *prefix*

  Build an **existDB** table from *some.fasta*. Write that table to disk. Load the table back. Compare that each mer in *some.fasta* is present in all three **existDB** tables created earlier.

- **-testexistence** *some.fasta*

  Build an **existDB** table from *some.fasta*, check that every mer in *some.fasta* can be found in the table. Does not guarantee that every mer in the table is found in the file.

- **-testexhaustive** *some.fasta* *some.meryl*

  Build an **existDB** table from *some.fasta*, check \_EVERY\_ mer for existence. Complain if a mer exists in the table but not in the [**meryl**(1)](/meryl/1.md) database. Assumes *some.meryl* is the mercount of *some.fasta*.

## SEE ALSO

[**meryl**(1)](/meryl/1.md), [**positionDB**(1)](/positionDB/1.md)