02-16-2012
Quote:
Originally Posted by
gani_85
Hi Kalpeer,
\( ..... \) :- this is called save operator, what ever you will put in side this like \(abc\), will be stored in unix system buffer(\1..\9). There are 9 system buffers present in unix which is used by shell to store some value for later use.
Here in this command:- sed 's/search/replace/'
1) sed 's/\(.*_\)\(....\)\(..\)\(..\)/\1\4\3\2/' :- the highlighted save operator will hold .*_ means "abc_test_" and will be stored in \1 (first system buffer)
2) sed 's/\(.*_\)\(....\)\(..\)\(..\)/\1\4\3\2/' :- the highlighted save operator will hold .... means 2012 and will be stored in \2 system buffer.
in this way month .. will be stored in \3 system buffer and day will be stored in \4 system buffer.
then you will replace the whole content with \1 means "abc_test_", \4 means day "13", \3 means month"02", \4 means year"2012". So finally you will get abc_test_13022012.dat
Please reply me if you r not clear abt save operator.... thnx
got it..Thanks a lot guru.
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