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Which shell? Which OS?



If the prefix will always end with "_", and if there are no "_" but in the prefix, it's trivial.

Something like:
$ prefix="$(ls |grep -o '.*_' |head -n1)
$ [ -f...

Or take the first 24 characters of the filename:

prefix=$(ls|head -1| sed 's/^\(.\{24\}\).*/\1/')
for file in acc faf prom subs ; do
[ -e ${prefix}${file}.csv ] || touch...

awk can have a string delimiter supplied and parse the first part as a separate string. Use that for determining your file names.

ls -1 *acc.csv | awk -F"acc.csv$" '{print $1}'

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