Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Passing PHP variables to shell program through shell_exec

Posted on 2013-01-07
3
Medium Priority
?
1,798 Views
Last Modified: 2013-01-11
I need to convert multiple ksh based .cgi files to php.  The shell_exec function appears to be just what I'm looking for since I need to utilize the standard shell tools like grep and awk.
It seems to work for me if I hard code what I'm looking for but doesn't recognize a variable passed from the PHP script:

This is a piece of script provided by liveaspankaj last year.  It has been modified to my needs.  The major issue is the $memberid variable is not recognized by grep.  Hardcoding the memberid works.  Quotes or no quotes are irrelevent.  I need to know how to enter the variable name so grep ( or any other program ) called by shell_exec can recognize it.
Also, pipeing ithe results to awk like this results in the entire record being displayed instead of the first field.  If I can get these two issues resolved, it will be a big step in getting all my files re-written and  i would be extremely grateful.


$output = shell_exec('grep "$memberid" MembersOnly/members.csv | awk -F, "{print $1}" | head -1');
0
Comment
Question by:dkauger
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 84

Accepted Solution

by:
Dave Baldwin earned 1500 total points
ID: 38753723
Try...

$output = shell_exec("grep $memberid MembersOnly/members.csv | awk -F, \"{print \$1}\" | head -1");

http://us3.php.net/manual/en/language.types.string.php
0
 

Author Comment

by:dkauger
ID: 38754647
Very close!  The correct quoting solved the variable passing problem.  Piping it to awk needed one correction.  Double quotes didn't work but changing it to single quotes made it work like a charm.  Didn't need the "tail -1" from the previous solution so eliminated it.
This is what worked for me:

$output = shell_exec("grep $memberid MembersOnly/members.csv | awk -F, '{print $1}' ");

I appreciate the help and hopefully I can take it from here.  The rest will be learning PHP :-)
0
 

Author Comment

by:dkauger
ID: 38769311
I've requested that this question be closed as follows:

Accepted answer: 0 points for dkauger's comment #a38754647

for the following reason:

The submitted solution was only partially correct.
0

Featured Post

[Webinar] Lessons on Recovering from Petya

Skyport is working hard to help customers recover from recent attacks, like the Petya worm. This work has brought to light some important lessons. New malware attacks like this can take down your entire environment. Learn from others mistakes on how to prevent Petya like worms.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Batch, VBS, and scripts in general are incredibly useful for repetitive tasks.  Some tasks can take a while to complete and it can be annoying to check back only to discover that your script finished 5 minutes ago.  Some scripts may complete nearly …
Active Directory replication delay is the cause to many problems.  Here is a super easy script to force Active Directory replication to all sites with by using an elevated PowerShell command prompt, and a tool to verify your changes.
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn how to count occurrences of each item in an array.

704 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question