Develop Reference

Parsing Options using Apache Commons Library

This might be sort of a noob question, but I am using the import org.apache.commons.cli.*; to set up my command line parser application.
This is how I am setting up my option.
Option n = Option.builder().hasArg(true).option("n").build();
options.addOption(n);
In one of our scenarios, we have a particular case where the input looks something like this "-n", "2", "3". Now this is not a valid scenario, because n should fail if you provide more than one value, without the "-n" flag.
Invalid: "-n", "2", "3"
Valid: "-n", "2", "-n", "3"
I was able to get the valid scenario working, but I am unable to get the invalid scenario working. because when I use getOptionValues(), I only get back 2 and not 3. Does anyone know how I can grab 3 too, and fail the invalid scenario.
Thanks.

You can use CommandLine.getArgList() to check for such "trailing" arguments,
CommandLine cmd = parser.parse(options, new String[] {"-n", "2", "3"});
assertTrue(cmd.hasOption(n));
assertEquals("[3]", cmd.getArgList().toString());
So you can fail parsing if cmd.getArgList() is not empty to catch such cases.

Using map functionality in shell script

I have below shellscript
MYMAP12=$(java -jar hello-0.0.1-SNAPSHOT.jar)
echo "==="
echo ${MYMAP12}
The output of java -jar hello-0.0.1-SNAPSHOT.jar will be map {one=one, two=two, three=three}
how to get each element from the key in shell script
I tried echo ${MYMAP12{one}} but it gave me an error

As #chepner implied, the Java code is just outputting a text string which has to be parsed and manipulated in bash to make it useful. There are no doubt several ways to do this, here is one which uses pure bash (i.e. no external programs):
# This is the text string supplied by Java
MYMAP12='{one=one, two=two, three=three}'
# Create an associative array called 'map'
declare -A map
# Remove first and last characters ( { and } )
MYMAP12=${MYMAP12#?}
MYMAP12=${MYMAP12%?}
# Remove ,
MYMAP12=${MYMAP12//,/}
# The list is now delimited by spaces, the default in a shell
for item in $MYMAP12
do
# This splits around '='
IFS='=' read key val <<< $item
map[$key]=$val
done
echo "keys: ${!map[#]}"
echo "values: ${map[#]}"
Gives:
keys: two three one
values: two three one
EDIT:
You should to use the correct tool for the job, if you need an associative array (map, hash table, dictionary) then you need a language with that feature. These include bash, ksh, awk, perl, ruby, python and C++.
You can extract the keys and values using a POSIX shell (sh) but you cannot store them in an associative array since sh does not have that feature. The best you can do is a generic list, which is just a text string of whitespace separated values. What you can do is to write a lookup function which emulates it:
get_value() {
map="$1"
key="$2"
for pair in $MYMAP12
do
if [ "$key" = "${pair%=*}" ]
then
value="${pair#*=}"
# Remove last character ( , or } )
value=${value%?}
echo "$value"
return 0
fi
done
return 1
}
MYMAP12='{kone=one, ktwo=two, kthree=three}'
# Remove first character ( { )
MYMAP12=${MYMAP12#?}
val=$(get_value "$MYMAP12" "ktwo")
echo "value for 'ktwo' is $val"
Gives:
value for 'ktwo' is two
Using this function you can also test for the presence of a key, for example:
if get_value "$MYMAP12" "kfour"
then
echo "key kfour exists"
else
echo "key kfour does not exist"
fi
Gives:
key kfour does not exist
Note that this is inefficient compared to an associative array since we are sequentially searching a list, although with a short list of only three keys you won't see any difference.

if you change your output format to the right hand side
$ x="( [one]=foo [two]=bar [three]=baz )"
then, you can use bash associative arrays
$ declare -A map="$x"
$ echo "${map[one]}"
foo

Can I create an option name with hyphens in apache commons cli?

I am trying to set Option name with hyphens in it like "source-files" using the Apache Commons CLI java library.
Option option = new Option("source-files", true, "List of source files")
I get this error,
java.lang.IllegalArgumentException: opt contains illegal character value '-'
at org.apache.commons.cli.OptionValidator.validateOption(OptionValidator.java:73)
at org.apache.commons.cli.Option.<init>(Option.java:123)
at org.apache.commons.cli.Option.<init>(Option.java:105)
Which means I cannot use an option name with a hyphen in it, which is the standard with unix commands. I noticed that Commons CLI documentation mentions a hyphenated option name in one their examples. Am I missing something here?

You can only use - in the "long name":
options.addOption("S", "source-files", true, "List of source files")
If you want to only have the long name, you may need to use OptionBuilder (not sure).

remove shell controll and non-printable characters from String (linux output)

In a web scanner application, i need to parse some script's output to get some informations, but the problem is that i don't get the same output in linux shell and in java output, let me describe it (this example is done with whatweb on one of the websites i need to scan at work, but i also have this problem whenever i have a colored output in shell):
Here is what i get from linux's output (with some colors):
http://www.ceris-ingenierie.com [200] Apache[2.2.9], Cookies[ca67a6ac78ebedd257fb0b4d64ce9388,jfcookie,jfcookie%5Blang%5D,lang], Country[EUROPEAN UNION][EU], HTTPServer[Fedora Linux][Apache/2.2.9 (Fedora)], IP[185.13.64.116], Joomla[1.5], Meta-Author[Administrator], MetaGenerator[Joomla! 1.5 - Open Source Content Management], PHP[5.2.6,], Plesk[Lin], Script[text/javascript], Title[Accueil ], X-Powered-By[PHP/5.2.6, PleskLin]
And here is what i get from Java:
[1m[34mhttp://www.ceris-ingenierie.com[0m [200] [1m[37mApache[0m[[1m[32m2.2.9[0m], [1m[37mCookies[0m[[1m[33mca67a6ac78ebedd257fb0b4d64ce9388,jfcookie,jfcookie%5Blang%5D,lang[0m], [1m[37mCountry[0m[[1m[33mEUROPEAN UNION[0m][[1m[35mEU[0m], [1m[37mHTTPServer[0m[[1m[31mFedora Linux[0m][[1m[36mApache/2.2.9 (Fedora)[0m], [1m[37mIP[0m[[1m[33m185.13.64.116[0m], [1m[37mJoomla[0m[[1m[32m1.5[0m], [1m[37mMeta-Author[0m[[1m[33mAdministrator[0m], [1m[37mMetaGenerator[0m[[1m[33mJoomla! 1.5 - Open Source Content Management[0m], [1m[37mPHP[0m[[1m[32m5.2.6,[0m], [1m[37mPlesk[0m[[1m[33mLin[0m], [1m[37mScript[0m[[1m[33mtext/javascript[0m], [1m[37mTitle[0m[[32mAccueil [0m], [1m[37mX-Powered-By[0m[[1m[33mPHP/5.2.6, PleskLin[0m]
My guess is that colors in linux's shell are generated by those unknown characters, but they are really a pain for parsing in java.
I get this output by running the script in a new thread, and doing raw_data+=data;(where raw_data is a String) whenever i have a new line in my output, to finally send raw_data to my parser.
How can i do to avoid getting those annoying chars and so, to get a more friendly output like i get in linux's shell?

In your Java code, where you are executing the shell script, you can add an extra sed filter to filter out the shell-control characters.
# filter out shell control characters
./my_script | sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g"
Use tr -dc '[[:print:]]' to remove non-printable characters, like this:
# filter out shell control characters
./my_script | \
sed -r "s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g" | \
tr -dc '[[:print:]]'
You could even add a wrapper script around the original script to do this. And call the wrapper script. This allows you to do any other pre-processing, before feeding it into the Java program and keeps it clean of all unnecessary code and you can focus on the core logic of the application.
If you can't add a wrapper script for any reason and would like to add the filter in Java, Java doesn't support pipes in the command, directly. You'll have to call your command as an argument to bash it like this:
String[] cmd = {
"/bin/sh",
"-c",
"./my_script | sed -r 's/\\x1B\\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g'"
};
Process p = Runtime.getRuntime().exec(cmd);
Don't forget to escape all the '\' when you use the regex in Java.
Source and description for the sed filter: http://www.commandlinefu.com/commands/view/3584/remove-color-codes-special-characters-with-sed

You can use a regex here:
String raw_data= ...;
String cleaned_raw_data = raw_data.replaceAll("\\[\\d+m", "");
This will remove any sequence of characters starting with a \\[, ending with a m and having between them one or more digit (\\d+).
Note that [ is preceded by a \\ because [ has a special meaning for regular expressions (it's a meta-character).
Description

VBScript: Error with regex matching incorrect registry values

I am trying to match a Java version in HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall by iterating over the subkeys within Uninstall. I am trying to match a regular expression to Java 7 Update 40, but the regex is matching all DisplayName entries. Below is the code:
On Error Resume Next
Const HKEY_LOCAL_MACHINE = &H80000002
Dim oReg
Dim objShell
Set objShell = WScript.CreateObject("WScript.Shell")
Set oReg = GetObject("winmgmts:{impersonationLevel=impersonate}!\.\root\default:StdRegProv")
Dim sPath, aSub, sKey
Set objRegEx = New RegExp
objRegEx.Pattern = "\w{4}\s\d{1}\s\w{6}\s\d+"
objRedEx.IgnoreCase = True
objRegEx.Global = False
sPath = "SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall"
oReg.EnumKey HKEY_LOCAL_MACHINE, sPath, aSub
For Each sKey In aSub
disName = "HKLM" & "\" & sPath & "\" & sKey & "\DisplayName"
unString = "HKLM" & "\" & sPath & "\" & sKey & "\UninstallString"
reDisName = objShell.RegRead(disName)
reUnString = objShell.RegRead(unString)
'Wscript.echo(reDisName)
If objRexEx.Test( reDisName ) Then
Wscript.echo "Match"
End If
'Wscript.echo ObjShell.RegRead(disName)
'Wscript.echo ObjShell.RegRead(unString)
Next
Sorry if the formatting is off, I put a ctrl-k in front of each code line. This is my first time posting here so go easy...

You should start all your scripts with Option Explicit and Dim all your variables. Then you wouldn't need sln's eagle eyes to spot your typo:
Option Explicit
Dim objRegEx : Set objRegEx = New RegExp
objRegEx.Pattern = "\w{4}\s\d{1}\s\w{6}\s\d+"
objRedEx.IgnoreCase = True
output:
cscript 19188400.vbs
...\19188400.vbs(4, 1) Microsoft VBScript runtime error: Variable is undefined: 'objRedEx'
If you insist on using a global On Error Resume Next (a most dangerous mal-practice) then you should disable it until your script is thoroughly debugged. Keeping the OERN in a script known to have even the slightest problem is inviting desaster. Asking for help with code containing a global OERN is futile. So run you program without the OERN and see if the cause for its misbehaviour in't obvious.
Diagnostic output should be as specific as possible. Your WScript.Echo "Match" just shows that the statement is executed; a WScript.Echo "Match", disname would be a bit better. Using .Execute and looking at the Match's details could be more revealing.
The .Pattern should be more specific to. If you look for java updates, anchoring a literal "java" at the start of the string, and asking for "upgrade" instead of "\w{6}" may help to avoid false positives. OTOH, my display names don't look like
Java 7 Update 19
but like
Java(TM) 6 Update 19
and who knows what the next owner of Java will put into the display name.

You seem to have a few typo's
objRedEx.IgnoreCase = True
...
If objRexEx.Test( reDisName ) Then