【shell】多命令执行顺序

；举例
[root@andon ~]# date;dd if=/dev/zero  of=/home/1  bs=1k count=10240;date  ##统计dd命令消耗时间，其中/dev/zero为空文件
Tue Jun 14 15:15:02 CST 2016
10240+0 records in
10240+0 records out
10485760 bytes (10 MB) copied, 0.0224696 s, 467 MB/s
Tue Jun 14 15:15:02 CST 2016

&&举例

[root@andon ~]# ls &&echo yes
1  anaconda-ks.cfg  install.log  install.log.syslog  shell
yes
[root@andon ~]# lss &&echo yes
-bash: lss: command not found

||举例

[root@andon ~]# ls || echo yes
1  anaconda-ks.cfg  install.log  install.log.syslog  shell
[root@andon ~]# lsd || echo yes
-bash: lsd: command not found
yes