Ive been asked to harden my linux clients by disabling the login shell to unwanted services. For example the services below were configured by default with bash shell in SLES12 SP2 installation. Im not sure about the impact if I will do this changes on the system.

Is it safe to reconfigure them with something like /sbin/nologin or /bin/false ?

at:x:25:25:Batch jobs daemon:/var/spool/atjobs:/bin/bash
ftp:x:40:49:FTP account:/srv/ftp:/bin/bash
games:x:12:100:Games account:/var/games:/bin/bash
lp:x:4:7:Printing daemon:/var/spool/lpd:/bin/bash
man:x:13:62:Manual pages viewer:/var/cache/man:/bin/bash
news:x:9:13:News system:/etc/news:/bin/bash
uucp:x:10:14:Unix-to-Unix CoPy system:/etc/uucp:/bin/bash