Shell条件判断语句上

一 按照文件类型进行判断

 

 

二 两种判断格式

test -e /root/install.log

[ -e /rout/install.log ]

第一个判断命令如果正确执行，则打印“yes”，否则打印“no”

[ -d /root ] && echo "yes" || "no"

 

三 实战

[root@localhost ~]# ls

abc canyls Downloads Pictures Templates

abcd ChangeLog-2.6.0 initial-setup-ks.cfg Public test.txt

anaconda-ks.cfg Desktop linux-2.6.39.tar.bz2 sh Videos

cangls Documents Music student.txt XshellXftpPortable.zip

[root@localhost ~]# [ -e /root/test.txt ]

[root@localhost ~]# [ -e /root/test.txt2 ]

[root@localhost ~]# echo $?

1

[root@localhost ~]# [ -d /root ] && echo "yes" || "no"

yes

[root@localhost ~]# [ -e /root/test.txt ] && echo "yes" || "no"

yes

 

四 按照文件权限判断

 

 

五 实战

[root@localhost ~]# [ -w /root/test.txt ] && echo "yes" || "no"

yes