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convert d/m/yyyy to YYYY-MM-DD

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# 1  
Old 09-09-2009
convert d/m/yyyy to YYYY-MM-DD
My csv has data like this

Code:
x,x,3452,2/18/1986,abc
x,g,19711,1/24/1986,abc

i want to replace date in the following format YYYY-mm-dd

how do i convert using awk script ?
Last edited by vgersh99; 09-09-2009 at 07:03 PM.. Reason: code tags, PLEASE!
# 2  
Old 09-09-2009
Code:
nawk -F, -v OFS=, '{split($4,a,"/");$4=sprintf("%s-%02d-%02d", a[3],a[1],a[2])}1' myFile.csv

# 3  
Old 09-09-2009
Hello Vgersh,

i've been studying awk and gawk recently and so I'd like to find out if we can do this using gsub or gensub functions?

when i used
Code:
/usr/xpg4/bin/awk -F\, '{printf "%s\n", $4}' FILE   it gives
2/18/1986
1/24/1986

But i tried it with gsub and gensub but couldnt do it (there are 3 sub fields in 2/18/1986)
Code:
usr/xpg4/bin/awk -F\, '{print gensub(/(.+)\/(.+)\/(.+)/, "\\3/\\2/\\1", "g", $4)}' FILE

this part gave error,
please advice me.
thanks in advance
# 4  
Old 09-09-2009
Quote:
Originally Posted by EAGL€
Hello Vgersh,

i've been studying awk and gawk recently and so I'd like to find out if we can do this using gsub or gensub functions?

when i used
Code:
/usr/xpg4/bin/awk -F\, '{printf "%s\n", $4}' FILE   it gives
2/18/1986
1/24/1986

But i tried it with gsub and gensub but couldnt do it (there are 3 sub fields in 2/18/1986)
Code:
usr/xpg4/bin/awk -F\, '{print gensub(/(.+)\/(.+)\/(.+)/, "\\3/\\2/\\1", "g", $4)}' FILE

this part gave error,
please advice me.
thanks in advance
'gensub' is a gawk extension not available in most other awk-s.
# 5  
Old 09-09-2009
sed 's~\([0-9]+\)/\([0-9]+\)/\([0-9]+\)~\3-\1-\2~' file
# 6  
Old 09-10-2009
Quote:
Originally Posted by edidataguy
sed 's~\([0-9]+\)/\([0-9]+\)/\([0-9]+\)~\3-\1-\2~' file
Edidataguy thanx, your code seemed ok to me but it didnt work, not gave an error and it does not update the file:
Code:
server1{root}>cat date.txt 
x,x,3452,2/18/1986,abc
x,g,19711,1/24/1986,abc
server1{root}>sed 's~\([0-9]+\)/\([0-9]+\)/\([0-9]+\)~\3-\1-\2~' date.txt
x,x,3452,2/18/1986,abc
x,g,19711,1/24/1986,abc

# 7  
Old 09-10-2009
A bit modification as follows needed:

Code:
sed 's|.*,\([0-9]*\)/\([0-9]*\)/\([0-9]*\),.*|\3-\1-\2|' file_name.txt
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