grep -o 只输入匹配内容，以换行分隔
因学到一个grep 参数
grep -o 'abcd'
Man
-o, --only-matching
Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.
因学到一个grep 参数
grep -o 'abcd'
-o, --only-matching
Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.