How to check for existence of multiple files in a shell script

# check for installation files existence
if  [ ! -f /tmp/file1 -a -f /tmp/file2 -a -f /tmp/file3 ]
then
echo "Some of the files file1, file2 or file3 are missing from /tmp "
exit 1
fi

How to list all nfs mountpoints

findmnt -t nfs

TARGET SOURCE                                               FSTYPE OPTIONS
/u01   pzl2ora1:/Oracle/software/pzh0oric/u01 nfs    rw,nodiratime,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,acregmin=300,acregmax=300,acdirmin=300,ac
/u02   pzl2ora1:/Oracle/pzh0oric/u02          nfs    rw,nodiratime,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,acregmin=300,acregmax=300,acdirmin=300,ac
/u03   pzl2ora1:/Oracle/pzh0oric/u03          nfs    rw,nodiratime,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,acregmin=300,acregmax=300,acdirmin=300,ac
/u04   pzl2ora1:/Oracle/pzh0oric/u04          nfs    rw,nodiratime,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,acregmin=300,acregmax=300,acdirmin=300,ac