feeding a LIST of files into a command; eg evince multiple files simultaneously

ls | grep B0950 | grep ps > pslist.B0950  (puts file names with B0950 and ps into a file pslist.B0950)

cat pslist.B0950+08 | xargs evince (cats the list file and passes it to xargs which puts them into a space-separated single line and provides that string as the argument for evince, thereby displaying all of the chosen postscript files onto the screen.