linux - 如何在shell中提取数字并分配给变量

Question

echo DEN_ML2.3_R02.zip | grep -o '[0-9]\+'

Output: 

2
3  
02

我想从 DEN_ML2.3_R02.zip 中 grep 2.3 和 02 并分配给变量

Answer 1

$ echo DEN_ML2.3_R02.zip | grep -Eo '\-?[0-9]+(\.[0-9]+)?'
                                              _________ _
                                                ^       ^
                                             group    quantifier

量词 ? 表示组是可选的

输出:

2.3
02

---

分配给变量要求:

$ read a1 a2 < <(echo $(grep -Eo '\-?[0-9]+(\.[0-9]+)?' <<< "DEN_ML2.3_R02.zip"))

或

$ read a1 a2 < <(
    grep -Eo '\-[0-9]+(\.[0-9]+)?' <<< "DEN_ML2.3_R02.zip" |
    tr '\n' ' '
)

结果:

$ echo $a1
2.3
$ echo $a2
02