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CASE INSENSITIVE CASE SENSITIVEThere are similar commands for usernames, if your logfile records these. By default, usernames are always case insensitive, but you can specify
USERCASE SENSITIVEto override this.
DIRSUFFIX default.htm(You can only have one DIRSUFFIX.) There are other built-in aliases for other items: for example, hostnames are converted to lower case at this point.
FILEALIAS /football.html /soccer.html HOSTALIAS lion lion.statslab.cam.ac.ukThere is also the special command FILEALIAS none, which cancels any other file aliases which might have been specified.
The alias commands for the other items are called BROWALIAS, REFALIAS, USERALIAS and VHOSTALIAS. Only one alias is ever applied to any item. So after
FILEALIAS /football.html /soccer.html FILEALIAS /soccer.html /brazil.htmlthe file /soccer.html would get translated to /brazil.html, but /football.html would only get translated to /soccer.html and would not see the second alias.
You can also use wildcards in ALIAS commands: ? matches any one character and * matches any number of characters (including none). And on the right-hand side, you can use $1, $2 etc. to represent the parts of the original name matched by the *'s. As a special abbreviation, if there is exactly one * on the left-hand side, then a * on the right-hand side can be used to represent $1. So, for example,
FILEALIAS /*/football/* /soccer/would translate /sport/football/rules.html to just /soccer/, but either of
FILEALIAS /*/football/* /$1/soccer/$2 # or FILEALIAS /sport/football/* /sport/soccer/*would translate /sport/football/rules.html to /sport/soccer/rules.html.
You can use $$ to get an actual $ on the right-hand side. Or you can prefix the right-hand side with "PLAIN:" to treat any $'s and *'s on the right-hand side literally. For example
FILEALIAS /*/football/* PLAIN:/$1/soccer/$2would translate /sport/football/rules.html to exactly /$1/soccer/$2
Analog's *'s are un-greedy: if there are two possible ways of matching, the part of the expression on the left matches as little as possible. This is more often what you want. But it contrasts with Perl's regular expressions, for example. (Oh, two consecutive *'s are completely useless, but if you try it they are collapsed into one before counting the $1, $2, etc.)
The behaviour of FILEALIAS and REFALIAS can be slightly unintuitive if the file has search arguments.
A warning to Unix users: if you put an ALIAS command on the command line with +C, the shell may try and expand $1 etc., which is not what you want. To stop the shell doing this, put the command in single quotes instead of double quotes.
TYPEALIAS .txt ".txt (Plain text files)"would provide an explanation of that line in the File Type Report.
There can be some confusion between some normal alias and output alias commands. For example, what is the difference between FILEALIAS and REQALIAS? In fact, there are several differences because of the different things the aliases are doing. FILEALIAS applies to the files themselves, but REQALIAS only applies to the lines in the Request Report. This means that FILEALIAS also affects the other reports which use the filenames, such as the Directory Report, whereas REQALIAS only affects the Request Report.
Another difference is that REQALIAS applies separately to each line of the Request Report. This means that if two separate files translate to the same thing in a FILEALIAS command, they will become one file for all the reports. But if you were to use the same REQALIAS command, they would still be two files, and would still be listed on separate lines in the Request Report, but with the same name.
So in summary, when should you use each command? FILEALIAS should be used if a single file has two different names; i.e., if your web server returns the same file for two different URLs. REQALIAS, on the other hand, would typically be used to annotate or clarify the Request Report. Sometimes it's useful to use both; first combine some files with FILEALIAS, and then annotate them in the Request Report with REQALIAS.
The full list of output aliases is REQALIAS, REDIRALIAS, FAILALIAS, TYPEALIAS, DIRALIAS, HOSTREPALIAS, REDIRHOSTALIAS, FAILHOSTALIAS, DOMALIAS, ORGALIAS, REFREPALIAS, REFSITEALIAS, REDIRREFALIAS, FAILREFALIAS, BROWREPALIAS, BROWSUMALIAS, OSALIAS, VHOSTREPALIAS, REDIRVHOSTREPALIAS, FAILVHOSTREPALIAS, USERREPALIAS, REDIRUSERALIAS and FAILUSERALIAS.
There is one known bug with the output aliases. The report is sorted before the alias is applied. This means that if the SORTBY for the report is set to ALPHABETICAL, then the report will not be sorted correctly.
You include regular expressions in an ALIAS command by prefixing the left-hand side of the alias with "REGEXP:". Or you can specify a case-insensitive match, like Perl m//i or Unix egrep -i, by using "REGEXPI:". (It's automatically case-insensitive for many items, such as hostnames, or filenames if you have specified CASE INSENSITIVE.)
On the right-hand side of the alias you can use $1, $2 etc. to represent the first, second etc. bracketed expression on the left-hand side, counting in order of the left brackets. (Again, you can't put $1, $2 etc. on the command line unless you put them in single quotes.)
Regular expressions match if they match just part of the string. If you want them to have to match the whole of the string, you have to anchor them to the ends of the string with ^ and $.
REQALIAS REGEXP:^(/~(.+?)/.*) "[$2] $1"would translate
[sret1] /~sret1/backgammon/rules.htmlin the Request Report. Or
HOSTALIAS REGEXP:^([^.]*)$ $1.mycompany.comwould add .mycompany.com to all hostnames not containing a dot. (See the FAQ for a discussion about whether this is a good idea.)
Regular expressions are greedy: if there are two possible ways of matching, the part of the expression on the left matches as much as possible.
Need help with analog? Use the analog-help mailing list.
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