Not sure if this info is available to all; so feel appropriate to post.
A Situation may arise whereby the Avast! UI is not working, say, or there's a need to use options not available from the GUI. It is just as easy to use the program from the commandline.Open a Terminal, and type: "avast --help"AVAST
avast - command-line virus scanneravast [OPTIONS] areaname DESCRIPTION
The program provides on-demand antivirus protection by scanning files for virus infections in a given location. If no directory is specified, the current one is used. All inserted paths are scanned recursively. The scanner allows virus detection and further actions to be taken on infected files. It features archive/packed file scanning, infected file deletion or repair. Scanner output can be written to a report file. It also supports a special stdin/stdout mode which makes it work as a filter (pipe).
To call up all these commands: -h, --help display help and exits
Mandatory arguments to long options are mandatory for short options too.
work in stdin/stdout (filter) mode
test all files, regardless of extension or content (default)
scan block devices
scan entire files (may be slow)
scan only directory content, don't scan subdirectories
ignore virus targeting
do not report statistics in the scanner output
allows setting of an action to be automatically performed: delete file - 1, repair file - 3, user input - 4
write output to a report file, '*' for OK results
scan inside archives. ARCHIVE_LIST may be `Z(zip)', `G(gzip)', `B(bzip2)`, `T(tar)', `I(mime)', `J(arj)', `R(rar)', `X(exec)', `O(zoo)', `Q(arc)', `H(lha)', `F(tnef)', `V(cpio)', `K(chm)', `P(rpm)', `Y(iso)', `D(dbx)', `6(sis)', `U(ole)', `C(cab)', `E(ace)', `1(install)', `W(winexec)', `A(all)' or `N(none)'
show list of virus/worm names matching PATTERN string, and quit -h, --help
display help and exits
display program usage, and quit
output current version information and exit
By default, avast! scans all files matching the given mask. Also, scanning inside zip, gzip, bzip2, tar, exec and winexec archives is set by default.
The program returns one of the following codes:
normal exit, nothing was found
at last one infected file was found
at last one infected file was found and was repaired
at last one infected file was found and cannot be repaired
at last one infected file was found and was deleted
at last one infected file was found and cannot be deleted
can't run virus scanner, avast! engine failed
at last one object wasn't scanned, an error has been detected
at last one object wasn't scanned, file(s) has been encrypted
stopped, scan wasn't completed
syntax error in input parameters
nothing to scan, input data error
virus list output
If you find any bugs in avast!, please report them to <firstname.lastname@example.org
ALWIL Software - http://www.avast.com/