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Operating Systems Solaris Sun Unix command clarification
# 1  
Old 07-11-2007
Sun Unix command clarification
I am reading a Sunsolve document covering moving /var and am confused by one step. What does this command do (in English):


Move into the existing /var directory and transfer all the data to /newvar
# cd /var
# tar cvf - . | (cd /newvar; tar xfBp -)
# 2  
Old 07-11-2007
You go into the /var directory. Then you use tar to create a file containing all its contents (tar cvf - .). You then move into /newvar and unpack the file there (cd /newvar;tar xfBp -).

The net effect is that you've copied all of /var into /newvar. Why they wouldn't do that with just cp -R /var /newvar I'm not sure . . . .
# 3  
Old 07-11-2007
A few reasons off hand I can think of these two:

1. It is faster.
2. It carries across hidden files ( dotfiles )
# 4  
Old 07-11-2007
a general paradigm for the recursive directory copying is:
Code:
(cd $SOURCE && tar cf - . ) | (cd $TARGET && tar xvfp -)

# 5  
Old 07-12-2007
Won't there be an 'p' while tarring also.
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