The script USES df, extracts only the line you want with grep, and then USES awk to extract the fourth column of data, which is the amount of freespace.
该脚本使用df仅提取了要进行grep的行，然后使用awk提取数据的第4列，该列是空闲空间的大小。
2
The building is configured around a central core, providing large columnfree office space at all levels.
建筑围绕中心核心建造，在所有层有巨大的无柱空间。
3
Internally the space is completely columnfree with all structure concealed within the external walls and glazed panoramic Windows.