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BASH: SED/AWK A Variable

Wed, 14 Oct 2009 00:38:32 -0700

Hi Im wondering how to extract data from a variable. I have a variable that contains YYYYMMDD, something like 20091013. Can I extract the year, YYYY, to varA, the month, MM, to varB and the day, DD to vabC?

Re: BASH: SED/AWK A Variable

Tue, 16 Mar 2010 14:45:37 -0700

here is an example of BASH Substring Extraction

dateString=YYYYMMDD
# 0-based indexing.
year=${dateString:0:4} # YYYY
month=${dateString:4:2} # MM
day=${dateString:6:2} # DD
echo "year=$year, month=$month, day=$day"

Re: BASH: SED/AWK A Variable

Mon, 28 Jun 2010 05:14:47 -0700

something like this, I mean
echo 20191012 | awk '{a=substr($0,1,4); c=substr($0,7,2);b=substr($0,5,2); print(c "." b "." a )}'