[英]how to invoke unix command in perl
i am trying to execute following unix command but its not getting executed 我正在尝试执行以下UNIX命令,但未执行
$array_of_tables= `dbsmp $srv_name`;
print "$array_of_tables\n";
please help me to find out list of tables in a data base through perl scripting. 请帮助我通过perl脚本找出数据库中的表列表。
Also i am trying to copy a file from a path to different path by using following command:- 我也试图通过使用以下命令将文件从路径复制到其他路径:
copy(`cd /osp/slee/service/$srv_name/bin/exec/script.txt`,`cd /osp/local/home/linus/amit/scripts`);
but getting an error:- 但出现错误:
Usage: copy(FROM, TO [, BUFFERSIZE])
please provide some solution Thanks 请提供一些解决方案,谢谢
Use doublequotes instead of back ticks. 使用双引号而不是反引号。
copy("/osp/slee/service/$srv_name/bin/exec/script.txt","/osp/local/home/linus/amit/scripts");
and remove the cd
并取出
cd
In Perl, the preferable way to capture the output of a system (shell) command is the qx()
operator. 在Perl中,捕获系统(shell)命令输出的首选方法是
qx()
运算符。 See http://perldoc.perl.org/perlop.html#Quote-Like-Operators . 请参阅http://perldoc.perl.org/perlop.html#Quote-Like-Operators 。
$array_of_tables = qx(dbsmp $srv_name);
print("$array_of_tables\n");
Actually, backticks should also work, so the problem must lie with your dbsmp command. 实际上,反引号也应该起作用,因此问题必须出在dbsmp命令上。 I'm not sure what that command is;
我不确定该命令是什么。 you'll have to provide more information about the utility and what error you're seeing.
您将必须提供有关实用程序以及所见错误的更多信息。
For comparison, I can retrieve the list of tables in my local postgres database as a pipe-separated table using this shell command: 为了进行比较,我可以使用以下shell命令以管道分隔表的形式检索本地postgres数据库中的表列表:
> psql -tAXq main postgres <<<\\d;
And this can be run from Perl as follows: 可以从Perl运行,如下所示:
> perl -e 'print(qx(psql -tAXq main postgres <<<\\\\d;));'
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