【shell】用sed獲取最後一個字符

1. 輸入：echo "hello" | sed 's/\(.*\)\(.\)$/\1/'spa     輸出：osed 2. 輸入：echo "hello" | sed 's/\(.*\)\(.\)$/\2/'     輸出：hell 注：\(...\)是分組的意思

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