unix - concatenate files with similar names using shell -


i have limited knowledge of shell scripting, example if have following files in folder

abcd_1_1.txt abcd_1_2.txt def_2_1.txt def_2_2.txt

i want output abcd_1.txt, def_2.txt. each pattern in file names, concantenate files , generate 'pattern'.txt output

patterns list <-? in patterns; echo cat "$i"* > "$i".txt; done

i not sure how code in shell script, appreciated.

maybe (assumes bash, , didn't test it).

declare -a prefix files=(*.txt) f in "${files[@]";     prefix[${f%_*}]= done key in "${!prefix[@]}";     echo "${prefix[$key]}.txt" done

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