This code snippet gets the default keystore used by the Java keytool and displays the list of aliases along with the key type (certificate or private key). import java.io.File; import java.io.FileInputSt... The default keystore used by the above code is: $HOME/.keystore .

In the simple taglib example , I used a tag handler class to implement a taglib. This is an example to implement a taglib with a UI component. The purpose is to use a custom tag to split a string and print each part in a separate paragraph, i.e., print <p>john</p> <p>steve</p> <p>mike</p> with custom tag <my:foreach> : <my:foreach var="who" value="john steve mike"> ... These are the files: pom.xml <project xmlns="http://maven.apache.org/POM/4.0.0"... src/main/java/com/example/UIForeash.java : package com.example; import java.io.IOExcep... src/main/resources/META-INF/faces-config.xml : <?xml version="1.0" encoding="UTF-8"?> <faces-c... src/main/resources/META-INF/foreach.taglib.xml : <?xml version="1.0" encoding="UTF-8"?> <facelet... How to use: Put the JAR file generated by the above project in the WEB-INF/lib folder of the web app. If the web app is a Maven project, just add the taglib project as a dependency:...

Use tcpdump to monitor traffic on a network: To print all incoming and outgoing packets on host 192.168.0.1 : tcpdump host 192.168.0.1 To print all incoming and outgoing IP packets on host firebird : tcpdump ip host firebird To write raw packets to a file, rather than parsing and printing them out: tcpdump ip host firebird -w /tmp/firebird.pcap To listen on interface eth0 (without this, tcpdump listens on the lowest numbered, configured up interface except loopback): tcpdump -i eth0 ip Use switch -X for more verbose output: tcpdump -i eth0 ip -X host 192.168.0.1 Outgoing from 192.168.0.1 : tcpdump -i eth0 ip -X src host 192.168.0.1 Incoming to 192.168.0.1 : tcpdump -i eth0 ip -X dst host 192.168.0.1 More verbose output: tcpdump -i eth0 tcp -vvX host 192.168.0.1...

This is an Android app that dumps any binarized xml file as plain text - to the sdcard on the device or emulator. build.xml : <?xml version="1.0" encoding="UTF-8"?> <project... AndroidManifest.xml <?xml version="1.0" encoding="utf-8"?> <man... res/layout/main.xml <?xml version="1.0" encoding="utf-8"?> <Lin... res/values/strings.xml : <?xml version="1.0" encoding="utf-8"?> <res... src/com/android/xmltool/DumpXml.java package com.android.xmltool; import java.ut... Screenshot Pre-built APK can be downloaded from: http://code.google.com/p/android-binxml-dump/

To list all installed packages: # pm list packages To list all disabled packages: # pm list packages -d pm help: # pm usage: pm [list|path|install|uninstall] ...

To start the Settings application: # am start -n com.android.settings/.Settings St... To start the Browser : # am start -n com.android.browser/.BrowserActivity... To start the phone dialer: # am start tel:210-385-0098 Starting: Intent { ... Help for am command: # am usage: am [subcommand] [options] ...

Here, = prints line number followed by new line, N appends the next line of input into the pattern space . Print line number at beginning of line, followed by a space: sed = test.txt | sed 'N;s/\n/ /' Print line number at beginning of line, followed by a tab: sed = test.txt | sed 'N;s/\n/\t/' Print line number right adjusted with 6 leading spaces: sed = test.txt | sed 'N; s/^/ /; s/\(.\{6,\}\...

Perl does not have built-in functions to get the base name or dir name from a file path. But on the Unix platforms we can rely on the executables basename and dirname . #!/usr/bin/perl $f = '/A path with/space "/file... The quotes, escapes, and chomp are necessary: # This fails when there's a space in $f $base =...

To view certificate in CERT.RSA : C:\tmp>openssl pkcs7 -inform DER -in CERT.RSA -noo... To convert certificate to PEM: openssl pkcs7 -inform DER -in CERT.RSA -out CERT.p... Java keytool also works: $ keytool -printcert -file CERT.RSA Owner: EMA...

The PHP constant __FILE__ is the current file name, __LINE__ is the current line number. These can be helpful writing error logs. <?php // __LINE__ is the current line numbe... Outputs: Current file is C:\scrap\test2.php, current line n...