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echo user1 user2 | xargs -n1 id

this might help..

% finger | awk ' { print "id -a "$1 } ' | grep -vi login | sh

When using variables in bash substitution :~$ for W in 0050569868B7 ABCDEFGHTY; do echo ${W::6}; done
005056
ABCDEF
~$

ruby -ne 'BEGIN{s=[]};s<<$_[0,6];END{File.readlines("textfile").each{|l|s.each{|y| puts l if l.match(y) } }}' infile

grep -o "^.\{6\}" infile |xargs -i grep {} textfile

Don't forget to use code tags.

grep -o "^.\{6\}" infile
awk '{print substr($0,0,6)}' infile

$ ruby -ne 'print "#{$_[0,6]}\n"' file
005056
ABCDEF

The 'D' as process state (between SHR and %CPU) means that the process is waiting for some kind of IO (or similar), which is not interruptible (not even by signals). The only way to get rid of them...

PXE / kickstart installs needs to have the following services.

TFTP, NFS-HTTP-CDROM-FLOPPY, DHCP.

TFTP - This is needed to deliver the pxelinux.o binary for the boot process.
NFS or HTTP...

No... As far as I know, only one process may have a port open.