c3b684f9b6
here is my test result:
[root@localhost ~]# sh -c 'for i in {1..100}; do sleep 1; if dig www.baidu.com;then exit 0; fi; exit 1'
sh: -c: line 1: syntax error: unexpected end of file
[root@localhost ~]# sh -c 'for i in {1..100}; do sleep 1; if dig www.baidu.com;then exit 0; fi;done; exit 1'
; <<>> DiG 9.9.4-RedHat-9.9.4-51.el7 <<>> www.baidu.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27927
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.baidu.com. IN A
;; ANSWER SECTION:
www.baidu.com. 1125 IN CNAME www.a.shifen.com.
www.a.shifen.com. 106 IN A 180.97.33.107
www.a.shifen.com. 106 IN A 180.97.33.108
;; Query time: 16 msec
;; SERVER: 192.168.0.1#53(192.168.0.1)
;; WHEN: Fri Oct 27 02:42:38 EDT 2017
;; MSG SIZE rcvd: 101
[root@localhost ~]# echo $?
0
[root@localhost ~]#
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|---|---|---|
| .. | ||
| admin | ||
| api-reference | ||
| concepts | ||
| getting-started-guides | ||
| home | ||
| reference | ||
| resources-reference | ||
| setup | ||
| tasks | ||
| tools | ||
| tutorials | ||
| user-guide | ||
| search.md | ||
| sitemap.md | ||
| update-user-guide-links.py | ||