use mmv command
Rename the file extension of all .csv files in the current directory to .xls
mmv “*.csv” “#1.xls”
Copy report6part4.txt to ./french/rapport6partie4.txt along with all similarly named files:
mmv -c “report*part*.txt” “./french/rapport#1partie#2.txt”
Append the contents of all .txt files into one file:
mmv -a “*.txt” “all.txt”
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