使用jar命令压缩和解压文件不会继承原来的权限，切记!

而使用zip/unzip压缩解压文件则会保留文件原来的权限等信息,因此使用压缩解压的时候尽量使用专业的工具

下面是测试内容和结果：

1.首先确认使用zip/unzip会继承文件原来的权限

[root@localhost ~]# umask

0022

[root@localhost ~]# mkdir tst

[root@localhost ~]# touch ./tst/aaa

[root@localhost ~]# touch ./tst/bbb

[root@localhost ~]# touch ./tst/ccc

[root@localhost ~]# ls -l ./tst

total 0

-rw-r--r-- 1 root root 0 Sep 25 00:59 aaa

-rw-r--r-- 1 root root 0 Sep 25 00:59 bbb

-rw-r--r-- 1 root root 0 Sep 25 00:59 ccc

[root@localhost ~]# chmod 700 ./tst/aaa

[root@localhost ~]# chmod 777 ./tst/bbb

[root@localhost ~]# ls -l ./tst                    -----修改三个文件的权限分别是700，777，644

total 0

-rwx------ 1 root root 0 Sep 25 00:59 aaa

-rwxrwxrwx 1 root root 0 Sep 25 00:59 bbb

-rw-r--r-- 1 root root 0 Sep 25 00:59 ccc

[root@localhost ~]# zip -r tst tst                 ------使用zip压缩一个包后，将原来目录改名

adding: tst/ (stored 0%)

adding: tst/bbb (stored 0%)

adding: tst/aaa (stored 0%)

adding: tst/ccc (stored 0%)

[root@localhost ~]# ls -l

total 20

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst

-rw-r--r-- 1 root root  512 Sep 25 01:00 tst.zip

[root@localhost ~]# mv tst tst_bak

[root@localhost ~]# ls -l

total 20

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst_bak

-rw-r--r-- 1 root root  512 Sep 25 01:00 tst.zip

[root@localhost ~]# unzip tst.zip                  ------使用unzip解压压缩包，查看权限没有改变

Archive:  tst.zip

creating: tst/

extracting: tst/bbb

extracting: tst/aaa

extracting: tst/ccc

[root@localhost ~]# ls -l tst

total 0

-rwx------ 1 root root 0 Sep 25 00:59 aaa

-rwxrwxrwx 1 root root 0 Sep 25 00:59 bbb

-rw-r--r-- 1 root root 0 Sep 25 00:59 ccc

2.使用上面的实验结果，测试jar解压文件后的变化

[root@localhost ~]# ls -l

total 24

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst_bak

-rw-r--r-- 1 root root  512 Sep 25 01:00 tst.zip

[root@localhost ~]# rm -fr tst                      ------删除掉原来的tst目录，然后使用jar解压原来zip压缩的文件(注意umask为022)

[root@localhost ~]# ls -l

total 20

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst_bak

-rw-r--r-- 1 root root  512 Sep 25 01:00 tst.zip

[root@localhost ~]# ls -l /home/oracle/oracle/product/11.2.0/dbhome_1/jdk/bin/jar

-rwxr-xr-x 1 oracle dba 62492 May  6  2009 /home/oracle/oracle/product/11.2.0/dbhome_1/jdk/bin/jar

[root@localhost ~]# export PATH=$PATH:/home/oracle/oracle/product/11.2.0/dbhome_1/jdk/bin/

[root@localhost ~]# which jar

/home/oracle/oracle/product/11.2.0/dbhome_1/jdk/bin/jar

[root@localhost ~]# jar xvf tst.zip

created: tst/

extracted: tst/bbb

extracted: tst/aaa

extracted: tst/ccc

[root@localhost ~]# ls -l tst                      ------使用jar解压后，在umask为022的情况下，解压后的文件权限为644

total 0

-rw-r--r-- 1 root root 0 Sep 25 01:06 aaa

-rw-r--r-- 1 root root 0 Sep 25 01:06 bbb

-rw-r--r-- 1 root root 0 Sep 25 01:06 ccc

[root@localhost ~]# umask 0000                      ------设置umask为000后,解压后的文件权限为666

[root@localhost ~]# ls -l

total 20

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst_bak

-rw-r--r-- 1 root root  512 Sep 25 01:00 tst.zip

[root@localhost ~]# jar xvf tst.zip

created: tst/

extracted: tst/bbb

extracted: tst/aaa

extracted: tst/ccc

[root@localhost ~]# ls -l tst

total 0

-rw-rw-rw- 1 root root 0 Sep 25 01:10 aaa

-rw-rw-rw- 1 root root 0 Sep 25 01:10 bbb

-rw-rw-rw- 1 root root 0 Sep 25 01:10 ccc

[root@localhost ~]#

因此可以得出,jar解压后文件的权限与用户当前的umask有关系，而与文件在原来压缩包中的权限没有关系。不会继承原来压缩包中的权限

3.测试jar压缩的时候会不会记录文件的权限

[root@localhost ~]# rm -fr tst tst.zip    ----删除原来的文件，然后设置umask为022，使用jar压缩带权限的文件，然后使用unzip解压

[root@localhost ~]# mv tst_bak tst

[root@localhost ~]# ls -l tst

total 0

-rwx------ 1 root root 0 Sep 25 00:59 aaa

-rwxrwxrwx 1 root root 0 Sep 25 00:59 bbb

-rw-r--r-- 1 root root 0 Sep 25 00:59 ccc

[root@localhost ~]# umask 022

[root@localhost ~]# jar cvf tst.zip tst

added manifest

adding: tst/(in = 0) (out= 0)(stored 0%)

adding: tst/bbb(in = 0) (out= 0)(stored 0%)

adding: tst/aaa(in = 0) (out= 0)(stored 0%)

adding: tst/ccc(in = 0) (out= 0)(stored 0%)

[root@localhost ~]# ls -l

total 20

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst

-rw-r--r-- 1 root root  699 Sep 25 01:19 tst.zip

[root@localhost ~]# mv tst tst_bak

[root@localhost ~]# unzip tst.zip

Archive:  tst.zip

creating: META-INF/

inflating: META-INF/MANIFEST.MF

creating: tst/

extracting: tst/bbb

extracting: tst/aaa

extracting: tst/ccc

[root@localhost ~]# ls -l tst            ---可以看到，使用unzip解压后的文件权限为644

total 0

-rw-r--r-- 1 root root 0 Sep 25 00:59 aaa

-rw-r--r-- 1 root root 0 Sep 25 00:59 bbb

-rw-r--r-- 1 root root 0 Sep 25 00:59 ccc

[root@localhost ~]# rm -fr tst            ---删掉解压后的文件，设置umask为000，再解压发现解压文件的权现为666

[root@localhost ~]# ls -l

total 24

drwxr-xr-x 2 root root 4096 Jun  4 20:56 Desktop

drwxr-xr-x 2 root root 4096 Sep 25 01:19 META-INF

drwxr-xr-x 2 root root 4096 Sep 25 00:59 tst_bak

-rw-r--r-- 1 root root  699 Sep 25 01:19 tst.zip

drwxr-xr-x 7 root root 4096 Jan 22  2010 vmware-tools-distrib

[root@localhost ~]# umask 0000

[root@localhost ~]# umask

0000

[root@localhost ~]# unzip tst.zip

Archive:  tst.zip

replace META-INF/MANIFEST.MF? [y]es, [n]o, [A]ll, [N]one, [r]ename: y

inflating: META-INF/MANIFEST.MF

creating: tst/

extracting: tst/bbb

extracting: tst/aaa

extracting: tst/ccc

[root@localhost ~]# ls -l tst

total 0

-rw-rw-rw- 1 root root 0 Sep 25 00:59 aaa

-rw-rw-rw- 1 root root 0 Sep 25 00:59 bbb

-rw-rw-rw- 1 root root 0 Sep 25 00:59 ccc

[root@localhost ~]#

因此可以判断，使用jar压缩的文件，解压后与系统当前环境的umask有关系。

通过这个实验可以判断，jar压缩和解压的时候，不会记录文件的权限.建议我们在使用这些工具的时候，一定要熟悉它们的特点