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BOM(文字コードの確認)は file コマンドでできる

$ file hoge.txt
hoge.txt: ASCII text # ← BOMなしUTF8
$ file hoge.txt
hoge.txt: UTF-8 Unicode (with BOM) text # ← BOMありUTF8


nkf でやるのが楽

$ nkf --overwrite --oc=UTF-8 hoge.txt # BOMの削除
# hoge.txt: ASCII text
$ nkf --overwrite --oc=UTF-8-BOM hoge.txt # BOMの追加
hoge.txt: UTF-8 Unicode (with BOM) text
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