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