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01.txt 999.txt  abc.txt
01_.txt 999_.txt abc_.txt

for filename in *.txt; do mv $filename ${filename/.txt/_.txt}; done;

・\$filename に "01.txt" "02.txt" "03.txt" が代入されるループになる
・${変数名/置換前/置換後} で文字列置換
・ for A in *; do ~~ ; done; はたまに使うので暗記したい・・


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