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Test Your Knowledge in Computers #943
Difficulty: Medium
The Smurf attack is a DDOS attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP broadcast address.
True or False?
Linux & Unix Commands - Search Man Pages

tracker-search(1) [suse man page]

tracker-search(1)						   User Commands						 tracker-search(1)

tracker-search - Search all content for keywords SYNOPSIS
tracker-search searches all indexed content for EXPRESSION. The resource in which EXPRESSION matches must exist (see --all for more infor- mation). All results are returned in ascending order. In all cases, if no EXPRESSION is given for an argument (like --folders for example) then ALL items in that category are returned instead. EXPRESSION One or more terms to search. The default operation is a logical AND. For logical OR operations, see -r. OPTIONS
-?, --help Give a short help message. -l, --limit=N Limit search to N results. The default is 512. -o, --offset=N Offset the search results by N. For example, start at item number 10 in the results. The default is 0. -r, --or-operator Use OR for search terms instead of AND (the default) -d, --detailed Show the unique URN associated with each search result. This does not apply to --music-albums and --music-artists. -a, --all Show results which might not be available. This might bebecause a removable media is not mounted for example. Without this option, resources are only shown if they exist. This option applies to all command line switches except --music-albums and --music-artists. -f, --files=EXPRESSION Search for files of any type matching EXPRESSION (optional). -e, --folders=EXPRESSION Search for folders matching EXPRESSION (optional). -m, --music=EXPRESSION Search for music files matching EXPRESSION (optional). --music-albums=ALBUM Search for music albums matching ALBUM (optional). --music-artists=ARTIST Search for music artists matching ARTIST (optional). -l, --images=EXPRESSION Search for images matching EXPRESSION (optional). -v, --videos=EXPRESSION Search for videos matching EXPRESSION (optional). -t, --documents=EXPRESSION Search for documents matching EXPRESSION (optional). -e, --emails=EXPRESSION Search for emails matching EXPRESSION (optional). Returns a list of subjects for emails found. -c, --contacts=EXPRESSION Search for contacts matching EXPRESSION (optional). Returns a list of names and email addresses found. -V, --version Print version. SEE ALSO
tracker-store(1), tracker-stats(1), tracker-tag(1), tracker-info(1). GNU
July 2009 tracker-search(1)

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EXPR(1) 							   User Commands							   EXPR(1)

expr - evaluate expressions SYNOPSIS
--help display this help and exit --version output version information and exit Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be: ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2 ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0 ARG1 < ARG2 ARG1 is less than ARG2 ARG1 <= ARG2 ARG1 is less than or equal to ARG2 ARG1 = ARG2 ARG1 is equal to ARG2 ARG1 != ARG2 ARG1 is unequal to ARG2 ARG1 >= ARG2 ARG1 is greater than or equal to ARG2 ARG1 > ARG2 ARG1 is greater than ARG2 ARG1 + ARG2 arithmetic sum of ARG1 and ARG2 ARG1 - ARG2 arithmetic difference of ARG1 and ARG2 ARG1 * ARG2 arithmetic product of ARG1 and ARG2 ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2 ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2 STRING : REGEXP anchored pattern match of REGEXP in STRING match STRING REGEXP same as STRING : REGEXP substr STRING POS LENGTH substring of STRING, POS counted from 1 index STRING CHARS index in STRING where any CHARS is found, or 0 length STRING length of STRING + TOKEN interpret TOKEN as a string, even if it is a keyword like `match' or an operator like `/' ( EXPRESSION ) value of EXPRESSION Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicograph- ical. Pattern matches return the string matched between ( and ) or null; if ( and ) are not used, they return the number of characters matched or 0. Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred. AUTHOR
Written by Mike Parker, James Youngman, and Paul Eggert. REPORTING BUGS
Report expr bugs to GNU coreutils home page: <> General help using GNU software: <> COPYRIGHT
Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
The full documentation for expr is maintained as a Texinfo manual. If the info and expr programs are properly installed at your site, the command info coreutils 'expr invocation' should give you access to the complete manual. GNU coreutils 7.1 July 2010 EXPR(1)

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