sed在文件中某一行最后添加一个数字
sed 's/\(^a.*\)/\1 12/' test
#cat test
askdj
aslkd aslkdjf3e
skdjfsdfj
sdkfjk
fsdkfjksdjfkjsdf
12sdfesdf
aslkdjfkasdjf asdlfkjaskdfj
#sed 's/\(^a.*\)/\1 12/' test
askdj 12
aslkd aslkdjf3e 12
skdjfsdfj
sdkfjk
fsdkfjksdjfkjsdf
12sdfesdf
aslkdjfkasdjf asdlfkjaskdfj 12
#cat test
askdj
aslkd aslkdjf3e
skdjfsdfj
sdkfjk
fsdkfjksdjfkjsdf
12sdfesdf
aslkdjfkasdjf asdlfkjaskdfj
#sed 's/\(^a.*\)/\1 12/' test
askdj 12
aslkd aslkdjf3e 12
skdjfsdfj
sdkfjk
fsdkfjksdjfkjsdf
12sdfesdf
aslkdjfkasdjf asdlfkjaskdfj 12
none