{}:可承载一个以逗号分隔的路径列表,并能够将其展开为多个路径;
mkdir -pv /tmp/{x,q}_{y,z}
mkdir: created directory ‘/tmp/x_y’ mkdir: created directory ‘/tmp/x_z’ mkdir: created directory ‘/tmp/q_y’ mkdir: created directory ‘/tmp/q_z’
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mkdir -pv /tmp/{x,q}_{y,z}
mkdir: created directory ‘/tmp/x_y’ mkdir: created directory ‘/tmp/x_z’ mkdir: created directory ‘/tmp/q_y’ mkdir: created directory ‘/tmp/q_z’