[root@localhost ~]# echo 12[33]44|awk -F[ '{print $1}'
12
[root@localhost ~]# echo 12[33]44|awk -F[ '{print $2}'
33]44
[root@localhost ~]# echo 12[33]44|awk -F"[" '{print $2}'
33]44
[root@localhost ~]# echo 12[33]44|awk -F"[\[\]]" '{print $2}'
awk: warning: escape sequence `\[' treated as plain `['
awk: warning: escape sequence `\]' treated as plain `]'
只能分2步去操作了，一个个来