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It attempts to eval the final character of the contents of $variable... probably not what you intended
cut -c <int> - returns the characters from the position int to the end of the string
...

ls |
awk -F_ '{ STR=$1; for(N=2; N<NF; N++) STR=STR"_"$N; T[STR]=1 } END { for(K in T) print K; }' |
while read LINE
do
cat ${LINE}_* > $LINE
...

# List files in the current directory
ls |
# Feed it into the AWK programming language.
# splits each line apart $1,$2,...$NF on the _ character.
# Then puts it back together into STR, minus the...

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No flames,...