Pass php variable to exec

Question

I need to get dimm info using ipmitool as follows:

exec("/usr/bin/ipmitool -I lan -H $spip -U root -P '$thepassword' sunoem cli 'show System/Memory/DIMMs/$a' | grep -i location", $dimm_loc, $ipmiretval);

$a is previously defined as: $a=$dimm[$i]

The return value for the above exec command is 1. If I replace $a with its vaule, i.e exec("/usr/bin/ipmitool -I lan -H $spip -U root -P '$thepassword' sunoem cli 'show System/Memory/DIMMs/D5' | grep -i location", $dimm_loc, $ipmiretval);

The exec command executes as expected. So it looks like $a cannot be used in the above example. How else can I pass the variable to the exec command?

Thanks!!

Bartosz Grzybowski · Accepted Answer · 2012-02-20 22:04:19Z

2

Run var_dump($a) and see what actualy it contains. Also dump the executed command as a string to see if command is formated properly.

answered Feb 20, 2012 at 22:04

Bartosz Grzybowski

1,1999 silver badges21 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Azp Over a year ago

Thanks Bartosz!!! Yes there was extra spaces at the beginning of the string that needed to be trimmed!!! Thanks a ton!!.

Bartosz Grzybowski Over a year ago

Remember, var_dump is your closest friend when it comes to debug something :)

ghoti · Accepted Answer · 2012-02-21 00:16:50Z

1

One more tip. Instead of doing an exec("some very long command line"), put your command line in a variable, then both LOG and exec() the variable. For example:

$fmt="/usr/bin/ipmitool -I lan -H %s -U root -P '%s' sunoem cli 'show System/Memory/DIMMs/%s' | grep -i location";

$cmd=sprintf($fmt, $spip, $thepassword, $a);
exec($cmd, $dimm_loc, $ipmiretval);
syslog(LOG_DEBUG, "Running: $cmd");

if ($ipmiretval > 0) {
  syslog(LOG_ERR, "exec FAILED: $cmd");
} else {
  syslog(LOG_DEBUG, "exec: $cmd");
}

answered Feb 21, 2012 at 0:16

ghoti

47.2k8 gold badges70 silver badges108 bronze badges

Collectives™ on Stack Overflow

Pass php variable to exec

2 Answers 2

2 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related