# Troubleshooting Tools Installed by Default
 
 The following troubleshooting tools are included in the full version of Photon OS: 
 
 * `grep`. Searches files for patterns. 
 * `ping`. Tests network connectivity. 
 * `strings`. Displays the characters in a file to identify its contents.
 * `lsmod`. Lists loaded modules.
 * `ipcs`. Shows data about the inter-process communication (IPC) resources to which a process has read access. This data includes shared memory segments, message queues, and semaphore arrays.
 * `nm`. Lists symbols from object files. 
 * `diff`. Compares files side by side. This tool is useful to compare configuration files of two versions when one version works and the other does not.