Three Musketeers text processing application

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Requirement 1 : The character dismantling (place special characters), and line feed

# 单个字符-->sed后向引用(.)-->去掉特殊字符

echo "I like playing basketball,ball and volleyball"|sed 's#[, ]##g' | sed -r 's#(.)#\1\n#g'

## 等价(多项编辑，要用-e 连接)

echo "I like playing basketball,ball and volleyball"|sed -re 's#[, ]##g' -e 's#(.)#\1\n#g'

# -r(正则扩展-->regexp-extended)

sed : one a process, too slow!

vim : once loaded into memory, files can not be too big !

awk: copy the entire row to $ 0 , is also a time to load into memory!

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