Running Command Line

As shown in Figure 13-2, running the command line with no arguments results in the display of the help text, generated by the options passed to CLI.

Figure 13-2. Running without arguments.

Passing in a single -s java.lang.String argument, as shown in Figure 13-3, searches the default system class path. As can be seen, the class can be found in the rt.jar file supplied with the JRE.

Figure 13-3. A simple search.

As shown in Figure 13-4, a more complex search can be performed by passing -s org.apache.commons.lang.StringUtils -p C:\devenv\ -r 6 as an argument. This searches for all instances of org.apache.commons.lang.StringUtils in the C:\devenv\ directory, with a maximum recursion depth of 6. As can be seen, a number of instances of the Lang library were found on my system. Some of these explicitly contain a reference to the version of the library; several do not. It's easy to imagine running this utility to search the installation of an application server to troubleshoot class path problems.

Figure 13-4. A complex search.