shell条件判断式语句

[root@localhost ~]# ls
aa   anaconda-ks.cfg  cangls       install.log.syslog  sh        test3.sh  tmp
abc  bols             install.log  japan               test2.sh  test.sh
###判断root下install.log文件是否存在 注意空格
[root@localhost ~]# [ -e /root/install.log ]
[root@localhost ~]# echo $?
0
[root@localhost ~]# [ -e /root/installs.slog ]
[root@localhost ~]# echo $?
1
[root@localhost ~]# [ -e /root/install.log ] && echo yes || echo no
yes
[root@localhost ~]# [ -e /root/install.logs ] && echo yes || echo no
no