Question

这是示例文件

[user@linux]$ cat DeviceA
DeviceA#sh ver
Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2)
[user@linux]$

Version 15.1(4)M10将被高亮

[user@linux]$ egrep --color=auto 'Version (15.1\(4\)M7|15.1\(4\)M10|15.2\(1\)T4)' DeviceA
Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2)
[user@linux]$

将grep输出用作变量var

[user@linux]$ var=$(egrep --color=auto 'Version (15.1\(4\)M7|15.1\(4\)M10|15.2\(1\)T4)' DeviceA)
[user@linux]$

打印变量var

[user@linux]$ echo $var
Cisco IOS Software, 1841 Software (C1841-ADVSECURITYK9-M), Version 15.1(4)M10, RELEASE SOFTWARE (fc2)
[user@linux]$

执行var时，我能否只获得Version 15.1(4)M10而不是将整个行作为echo $var？

所需的输出

[user@linux]$ echo $var
Version 15.1(4)M10
[user@linux]$

Answer 1

如Jww所提到的，可以使用-o标志轻松实现：

命令行：

fgrep -o "Version 15.1(4)M10" testtttt.txt, or, for introducing variable handling:
echo $(fgrep -o "Version 15.1(4)M10" testtttt.txt)

在脚本中，您可能会执行类似的操作（未经测试）：

var=$(fgrep -o "Version 15.1(4)M10" testtttt.txt)
echo $var

Answer 2

尝试一下：

tmp="${var%,*}"           # remove last part after ,
echo "${tmp##*,}"         # print last part after ,

如何将grep match用作变量（而不是整行）

2 个答案: