find 命令通配符(*)问题

结论：find命令中使用通配符(*)时，务必加上双引号，虽然有时不加双引号也能正常工作，但这是偶然的，有前提的。如下：

When you run find . -name *.bak, the third command-line argument, .bak, is expanded by the shell before it is passed to find. Shell expansion will convert it to a space-delimited list of all the filenames in the current directory that match it, i.e., all the files whose names consist of zero or more characters () followed by .bak. When you enclose *.bak in quotes, that escapes the * wildcard, so the expression is passed unexpanded. You could alternatively use find . -name *.bak.

-name pattern
Don't forget to enclose the pattern in quotes in order to protect it from expansion by the shell.

# 通配符(*)会被shell展开
[root@huayd2 ~]# echo *
anaconda-ks.cfg Desktop Documents Downloads huayd initial-setup-ks.cfg install_docker.sh mariadb-10.1.23-rhel-7-x86_64-rpms.tar mariadb-10.2.6-rhel-7-x86_64-rpms mariadb-10.2.6-rhel-7-x86_64-rpms.tar Music p13390677_112040_Linux-x86-64_1of7.zip p13390677_112040_Linux-x86-64_2of7.zip passwd.txt Percona Percona.txt perl5 Pictures Public Templates tp.sh Videos
[root@huayd2 ~]# 

# /root目录下有 zip结尾的文件，通配符(*)会被展开，展开后命令不再符合find命令的语法规则，直接报错
[root@huayd2 ~]# pwd
/root
[root@huayd2 ~]# find /root -name *.zip
find: paths must precede expression: p13390677_112040_Linux-x86-64_2of7.zip
Usage: find [-H] [-L] [-P] [-Olevel] [-D help|tree|search|stat|rates|opt|exec] [path...] [expression]
[root@huayd2 ~]# 
[root@huayd2 ~]# 


# /tmp目录下没有 zip结尾的文件，因此通配符(*)不会被展开
# 也因此虽然通配符(*)上没有加双引号，find也能正常工作
[root@huayd2 ~]# cd /tmp/
[root@huayd2 tmp]# find /root -name *.zip
/root/p13390677_112040_Linux-x86-64_1of7.zip
/root/p13390677_112040_Linux-x86-64_2of7.zip
[root@huayd2 tmp]# 
[root@huayd2 tmp]# 
[root@huayd2 tmp]# cd -
/root
[root@huayd2 ~]# pwd
/root
[root@huayd2 ~]# find /root -name "*.zip"
/root/p13390677_112040_Linux-x86-64_1of7.zip
/root/p13390677_112040_Linux-x86-64_2of7.zip
[root@huayd2 ~]# 
[root@huayd2 ~]# 
[root@huayd2 ~]# find /root -name \.zip
[root@huayd2 ~]# find /root -name \*.zip
/root/p13390677_112040_Linux-x86-64_1of7.zip
/root/p13390677_112040_Linux-x86-64_2of7.zip
[root@huayd2 ~]# 

--End
Mason