[root@localhost ~]# a=123
[root@localhost ~]# echo "1" | sed ‘s/1/"‘$a‘"/‘
"123"
[root@localhost ~]# echo "1" | sed ‘s/1/‘$a‘/‘
123
[root@localhost ~]# awk ‘BEGIN{print ‘$a‘}‘
123
[root@localhost ~]# awk ‘BEGIN{print ‘"$a"‘}‘
123
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原文地址:http://8855546.blog.51cto.com/8845546/1649917