clamscan(1)

NAME

clamscan - scan files and directories for viruses

SYNOPSIS

clamscan [options] [file/directory/-]

DESCRIPTION

clamscan is a command line anti-virus scanner.

OPTIONS

-h, --help
    Print help information and exit.

-V, --version
    Print version number and exit.

-v, --verbose
    Be verbose.

--debug
    Display debug messages from libclamav.

--quiet
    Be quiet (only print error messages).

--stdout
    Write all messages (except for libclamav output) to the standard output (stdout).

-d FILE/DIR, --database=FILE/DIR
    Load virus database from FILE or load all virus database files from DIR.

-l FILE, --log=FILE
    Save scan report to FILE.

--tempdir=DIRECTORY
    Create temporary files in DIRECTORY. Directory must be writable for the 'clamav' user or unprivileged user running clamscan.

--leave-temps
    Do not remove temporary files.

-r, --recursive
    Scan directories recursively. All the subdirectories in the given directory will be scanned.

--bell
    Sound bell on virus detection.

--no-summary
    Do not display summary at the end of scanning.

--exclude=PATT, --exclude-dir=PATT
    Don't scan file/directory names containing PATT. It may be used multiple times.

--include=PATT, --include-dir=PATT
    Only scan file/directory names containing PATT. It may be used multiple times.

-i, --infected
    Only print infected files.

--remove
    Remove infected files. Be careful.

--move=DIRECTORY
    Move infected files into DIRECTORY. Directory must be writable for the 'clamav' user or unprivileged user running clamscan.

--copy=DIRECTORY
    Copy infected files into DIRECTORY. Directory must be writable for the 'clamav' user or unprivileged user running clamscan.

--no-mail
    Disable scanning of mail files.

--no-phishing-sigs
    Disable signature-based phishing detection.

--no-phishing-scan-urls
    Disable url-based phishing detection. (Only available in experimental builds)

--no-phishing-restrictedscan
    Enable phishing detection for all domains (might lead to false positives!).(Only available in experimental builds)

--phishing-ssl
    Always block SSL mismatches in URLs (might lead to false positives!). (Only available in experimental builds)

--phishing-cloak
    Always block cloaked URLs (might lead to some false positives). (Only available in experimental builds)

--no-algorithmic
    In some cases (eg. complex malware, exploits in graphic files, and others), ClamAV uses special algorithms to provide accurate detection. This option disables the algorithmic detection.

--no-pe
    PE stands for Portable Executable - it's an executable file format used in all 32-bit versions of Windows operating systems. By default ClamAV performs deeper analysis of executable files and attempts to decompress popular executable packers such as UPX, Petite, and FSG. This option disables PE support and should be used with care!

--no-elf
    Executable and Linking Format is a standard format for UN*X executables. This option disables ELF support.

--no-ole2
    Disable support for Microsoft Office documents and .msi files.

--no-pdf
    Disable scanning within PDF files.

--no-html
    Disable support for HTML detection and normalisation.

--no-archive
    Disable archive support built in libclamav.

--detect-broken
    Mark broken executables as viruses (Broken.Executable).

--block-encrypted
    Mark encrypted archives as viruses (Encrypted.Zip, Encrypted.RAR).

--block-max
    Mark archives as viruses (e.g. RAR.ExceededFileSize, Zip.ExceededFilesLimit) if max-files, max-space, or max-recursion is reached.

--mail-follow-urls
    If an email contains URLs ClamAV can download and scan them. WARNING: This option may open your system to a DoS attack. Never use it on loaded servers.

--max-files=#n
    Extract first #n files from each archive. This option protects your system against DoS attacks (default: 500)

--max-space=#n
    Extract first #n kilobytes from each archive. You may pass the value in megabytes in format xM or xm, where x is a number. This option protects your system against DoS attacks (default: 10 MB)

--max-recursion=#n
    Set archive recursion level limit. This option protects your system against DoS attacks (default: 8).

--max-ratio=#n
    Set maximum archive compression ratio limit. This option protects your system against DoS attacks (default: 250).

--max-mail-recursion=#n
    Recursion level limit for the internal mail scanner.

--max-dir-recursion=#n
    Maximum depth directories are scanned at (default: 15).

--unzip[=FULLPATH]
    In most cases you don't need this option - the built-in unarchiver will extract Zip archives. Howvere, this option may be used as a backup for internal unpacker - see the full documentation for more information. When enabled without an argument, unzip program will be searched in $PATH. If unzip cannot be found in $PATH, you must force it with =pathname. Remember about '=' between the option and the argument.

--unrar[=FULLPATH]
    Scan .rar files. In most cases the unpacker built into libclamav is enough.

--arj[=FULLPATH]
    Scan .arj files.

--unzoo[=FULLPATH]
    Scan .zoo files.

--lha[=FULLPATH]
    Scan .lzh files.

--jar[=FULLPATH]
    clamscan uses unzip for .jar files, so in some cases you may need to pass a full path to unzip. In most cases the unpacker built into libclamav is enough.

--deb[=FULLPATH]
    This option supports debian binary packages. Implies --tgz, but doesn't conflict with --tgz=FULLPATH. It requires ar utility.

--tar[=FULLPATH]
    This option supports non-compressed tar archives. In most cases the unpacker built into libclamav is enough.

--tgz[=FULLPATH]
    This option supports tar.gz and .tgz files. You need GNU tar, on non-Linux system you probably have it installed as gtar. If it's in $PATH, please use --tgz=gtar in other case please pass a full path. In most cases the unpacker built into libclamav is enough.

EXAMPLES

(0) Scan a single file:
    clamscan file

(1) Scan a current working directory:
    clamscan

(2) Scan all files (and subdirectories) in /home:
    clamscan -r /home

(3) Load database from a file and limit disk usage to 50 MB:
    clamscan -d /tmp/newclamdb --max-space=50m -r /tmp

(4) Scan a data stream:
    cat testfile | clamscan -

(5) Scan a mail spool directory:
    clamscan -r /var/spool/mail

RETURN CODES

Note: some return codes may only appear in a single file mode (when clamscan is started with a single argument). Those are marked with (ofm). 0 : No virus found.

1 : Virus(es) found.

40: Unknown option passed.

50: Database initialization error.

52: Not supported file type.

53: Can't open directory.

54: Can't open file. (ofm)

55: Error reading file. (ofm)

56: Can't stat input file / directory.

57: Can't get absolute path name of current working directory.

58: I/O error, please check your file system.

59: Can't get information about current user from /etc/passwd.

60: Can't get information about user 'clamav' (default name) from /etc/passwd.

61: Can't fork.

62: Can't initialize logger.

63: Can't create temporary files/directories (check permissions).

64: Can't write to temporary directory (please specify another one).

70: Can't allocate memory (calloc).

71: Can't allocate memory (malloc).

CREDITS
Please check the full documentation for credits.

AUTHOR

Tomasz Kojm <tkojm@clamav.net>

SEE ALSO

clamdscan(1), freshclam(1)