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Calling Bash script from PHP not outputting correct values

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1

I am attempting to call a bash script from PHP. When I run this bash script on my text file from the command line, I get the desired output. However, through PHP, it simply outputs nothing.

The following is my PHP code.

$output = shell_exec("path/to/script.sh tmp/file.txt");
echo $output;

Where path/to/script is, as it sounds, the path to the bash script, and tmp/file.txt is the argument for the script. The output of this is blank, yet when I run the bash script with the same input in the command line, it executes properly. Why is this?

php bash

share|improve this question

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can you show us exactly what is your PHP script and what you type in the command line?
  
  – user1334621
  Mar 21 at 23:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is tmp/file.txt a relative path, sometimes you can have issues with what the working directory is when calling scripts from other locations. I see this a lot more on windows. So it may be that it is failing silently too.
  
  – ArtisticPhoenix
  Mar 22 at 4:51
  
  

  
  
  
  

add a comment | 

0

1

I am attempting to call a bash script from PHP. When I run this bash script on my text file from the command line, I get the desired output. However, through PHP, it simply outputs nothing.

The following is my PHP code.

$output = shell_exec("path/to/script.sh tmp/file.txt");
echo $output;

Where path/to/script is, as it sounds, the path to the bash script, and tmp/file.txt is the argument for the script. The output of this is blank, yet when I run the bash script with the same input in the command line, it executes properly. Why is this?

php bash

share|improve this question

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can you show us exactly what is your PHP script and what you type in the command line?
  
  – user1334621
  Mar 21 at 23:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  is tmp/file.txt a relative path, sometimes you can have issues with what the working directory is when calling scripts from other locations. I see this a lot more on windows. So it may be that it is failing silently too.
  
  – ArtisticPhoenix
  Mar 22 at 4:51
  
  

  
  
  
  

add a comment | 

I am attempting to call a bash script from PHP. When I run this bash script on my text file from the command line, I get the desired output. However, through PHP, it simply outputs nothing.

The following is my PHP code.

$output = shell_exec("path/to/script.sh tmp/file.txt");
echo $output;

Where path/to/script is, as it sounds, the path to the bash script, and tmp/file.txt is the argument for the script. The output of this is blank, yet when I run the bash script with the same input in the command line, it executes properly. Why is this?

php bash

share|improve this question

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

$output = shell_exec("path/to/script.sh tmp/file.txt");
echo $output;

share|improve this question

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

share|improve this question

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

asked Mar 21 at 23:30

ToasterFrogsToasterFrogs

154

1 Answer
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0

This is hard to answer without seeing script.sh however I can see that shell_exec outputs null when it fails.

You could try using the exec() function to review the exit code of the script.
php manual exec()

so the code would be:

exec("path/to/script.sh tmp/file.txt", $output);
echo $output;

You might find that it's a permission issue stopping the process from making changes to it.

try changing the file permissions with chmod 777 tmp/file.txt

share|improve this answer

answered Mar 22 at 0:09

Chris LindenChris Linden

164

add a comment | 

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0

This is hard to answer without seeing script.sh however I can see that shell_exec outputs null when it fails.

You could try using the exec() function to review the exit code of the script.
php manual exec()

so the code would be:

exec("path/to/script.sh tmp/file.txt", $output);
echo $output;

You might find that it's a permission issue stopping the process from making changes to it.

try changing the file permissions with chmod 777 tmp/file.txt

share|improve this answer

answered Mar 22 at 0:09

Chris LindenChris Linden

164

add a comment | 

0

This is hard to answer without seeing script.sh however I can see that shell_exec outputs null when it fails.

You could try using the exec() function to review the exit code of the script.
php manual exec()

so the code would be:

exec("path/to/script.sh tmp/file.txt", $output);
echo $output;

You might find that it's a permission issue stopping the process from making changes to it.

try changing the file permissions with chmod 777 tmp/file.txt

share|improve this answer

answered Mar 22 at 0:09

Chris LindenChris Linden

164

add a comment | 

This is hard to answer without seeing script.sh however I can see that shell_exec outputs null when it fails.

You could try using the exec() function to review the exit code of the script.
php manual exec()

so the code would be:

exec("path/to/script.sh tmp/file.txt", $output);
echo $output;

You might find that it's a permission issue stopping the process from making changes to it.

try changing the file permissions with chmod 777 tmp/file.txt

share|improve this answer

answered Mar 22 at 0:09

Chris LindenChris Linden

164

exec("path/to/script.sh tmp/file.txt", $output);
echo $output;

share|improve this answer

answered Mar 22 at 0:09

Chris LindenChris Linden

164

answered Mar 22 at 0:09

Chris LindenChris Linden

164

answered Mar 22 at 0:09

Chris LindenChris Linden

164