在php中使用Linux awk命令
[英]Using Linux awk command in php
问题描述
Good Day All I'm having a problem getting this command to work on button press I need to search through a file and output the results in comma delimited text. 
美好的一天所有我在使该命令按按钮时都遇到问题时，我需要搜索文件并以逗号分隔的文本输出结果。 PHP doesnt seem to like the curly brackets so as far as I could read I need to use exec(), but to no avail as the error I recieve is "syntax error, unexpected T_LNUMBER, expecting T_VARIABLE or '$'" I'm still new to php so sorry if the answer is obvious! 就我所知，PHP似乎不喜欢花括号，但我需要使用exec（），但无济于事，因为我收到的错误是“语法错误，意外的T_LNUMBER，期待的T_VARIABLE或'$'”还是php的新手，如果答案很明显，对不起！ Any info will be helpful, Thanks 任何信息都会有所帮助，谢谢
<html>
<body>
<h1>Linux Command Test</h1>
<form method="POST" action="">
<input type="submit" id="submit" name="submit" value="Submit"/>
</form>
<?php
if (isset($_POST['submit']))
{
$output = exec('grep -i hello test.txt | awk -v OFS=, '{\$1=\$1;print}' > newtest.txt');
echo "<pre>$output</pre>";
}
?>
</body>
</html>
3 个解决方案
解决方案1
3 2013-05-07 12:31:47
尝试转义$
grep -i hello test.txt | awk -v OFS=, '{\$1=\$1;print}' > newtest.txt
解决方案2
2 已采纳 2013-05-07 13:02:04
$output = exec('grep -i hello test.txt | awk -v OFS=, '{\$1=\$1;print}' > newtest.txt');
should be: 应该：
$output = exec('awk -v OFS=, \'/hello/i {$1=$1;print}\' test.txt > newtest.txt');
You need to escape the quotes, otherwise they delimit the PHP string. 您需要对引号进行转义，否则它们将界定PHP字符串。 You don't need to escape $ inside single-quoted strings in PHP. 您无需在PHP中的单引号内转义$ 。 You shouldn't redirect the awk output to a file if you want to capture it in a PHP variable. 如果要将awk输出捕获到PHP变量中，则不应将其重定向到文件。
And there's no need to pipe grep to awk , since awk has built-in pattern matching. 而且，由于awk具有内置模式匹配，因此无需将grep传递给awk 。
解决方案3
0 2013-05-07 12:31:18
There are bunch of functions you can use in PHP to invoke external applications, exec() , system() etc: http://www.php.net/manual/en/ref.exec.php but mind that it's up to administrator to let you use them. 您可以在PHP中使用一堆函数来调用外部应用程序， exec() ， system()等： http : //www.php.net/manual/en/ref.exec.php，但请注意，这取决于管理员让您使用它们。 On most shared hostings these functions are disabled 在大多数共享主机上，这些功能被禁用
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