Shell Programming and Scripting

Hi

i have many sets of files as shown below(here i have shown 2 sets)

basel_aa_20091030.txt
basel_aa_20091130.txt
basel_aa_20091230.txt

basel_bb_20091030.txt
basel_bb_20091130.txt
basel_bb_20091230.txt

from each set of files i need to select the latest updated file(there are many such sets of files)
eg: basel_aa_20091230.txt
basel_bb_20091230.txt

can some one help on this?

Thanks

Untested.
The idea is to find all the unique filename prefixes, then find the most recent file with that prefix.

Code:

ls -1 basel_??_????????\.txt 2>/dev/null | cut -c1-8 | sort | uniq | while read prefix
do
         ls -1t "${prefix}"* | sed -n "1 p"
done

Code:

ls basel*.txt|sort -n|awk -F "_"  '{a[$2]=$3} END {for (i in a) print "basel_"i"_"a[i]}'

check if this helps

Code:

ls basel* | sort -nr | uniq -w8

HTH,
PL