AWK传入shell变量举例

disk=sda
[root@localhost monitor]# echo $disk
sda

[root@localhost monitor]# iostat | awk 'BEGIN{disk="'"$disk"'"}{if ($1==disk) print;}'
sda               0.15         0.12         3.90     307283    9924087
[root@localhost monitor]# iostat
Linux 3.10.0-862.el7.x86_64 (localhost.localdomain) 	08/12/2020 	_x86_64_	(32 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.00    0.00    0.00   99.99

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
fd0               0.00         0.00         0.00          8          0
sdb               0.00         0.00         0.00       6639          0
sda               0.15         0.12         3.90     307283    9924087
dm-0              0.26         0.11         3.85     277153    9800480
dm-1              0.00         0.00         0.00       3260          0