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Remove tab with comma in file: perl -lpe 's/\t/,/g' < flattened_line_0.fa.data > output.csv #PerlTrick #PerlO,liner #Perl #Tab #Comma

Join the result of ls -1 into one line and delimit it with comma : newStr=$(ls -m *.txt) or mystring=$(printf "%s," *) #Bash #Comma #String #List #ls