step 1
rpm -e|grep kernel
step 2
#!/bin/bash
target=(kernel-3.10.0-957.12.2.el7.x86_64 kernel-3.10.0-957.10.1.el7.x86_64
kernel-3.10.0-957.21.2.el7.x86_64)
index=0
while [ $index -lt ${#target[@]} ]
do
#echo ${target[$index]}
rpm -e ${target[$index]}
let index++
done
save a uninstall_old_kernel.sh
modify your shell file ,replace the varible of target
such as
target=(aaa1,aa2,aaa3,aaa4)
aaa1 is your kernel old release