shell中变量内容的删除、替换

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path=/home/miaomiao/bin:/home/miaomiao/.local/bin:/home/miaomiao/dev/env/maven/bin:/home/miaomiao/dev/env/jdk1.8.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

echo $path

echo "-----"
# 从左至右，最短
echo ${path#/*miaomiao}

echo "-----"
# 从左至右，最长
echo ${path##/*miaomiao}

echo "-----"
# 从右至左，最短
echo ${path%/*miaomiao}

echo "-----"
# 从右至左，最长
echo ${path%%/*miaomiao}

echo "-----"
# 从左至右，将第一个miaomiao替换为baba
echo ${path/miaomiao/baba}

echo "-----"
# 从左至右，将miaomiao全部替换为baba
echo ${path//miaomiao/baba}