#summary What is required in order to run PPSS? #labels Phase-Requirements = Requirements = The sole requirement for PPSS to work is the Bash shell and the availability of the mkfifo command. PPSS is written using features that are specific to the Bash shell and is thus not portable to shells like dash and ksh. For distributed PPSS, a host with SSH access is necessary. Also, clients and server must be configured in order to use SSH keys.