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Save the output of the command run as other user

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# 1  
Old 02-13-2010
Data Save the output of the command run as other user
Dear All,

I am writing a script and kind of stuck in a small thing. Cannot figure it out. so please help

I am logged in as root user. I want to switch user to "user1" inside the script and execute a specific command lets say "pwd" and come back where i started.

I know how to switch user, run command and come back i.e,
Code:
su - user1 -c "pwd"


I just want two things.

1). Save the output of the command given as user1 in a variable inside a script and use it somewhere else lets say for comparing etc
I have tried several things but didn't work out....

2). I do not want the output of this command to appear on screen while running the script but saving the output of the command in some variable.

Code:
#!/bin/sh
su - user1 -c "pwd"                     # Store the output of this command in variable "check"
if [ "/export/home" -eq $check ]
 then
     echo "The path is correct\n"
 else
     echo "The path is not correct\n"
fi

Thanks
Last edited by Franklin52; 02-13-2010 at 09:12 AM.. Reason: Please use code tags!
# 2  
Old 02-13-2010
You're using the comparison operator for integers (-eq). To store the output in a variable, do something like:
Code:
#!/bin/sh

check=$(su - user1 -c "pwd")	# Store the output of this command in variable "check"

if [ "$check" == "/export/home" ]
then
  echo "The path is correct\n"
else
  echo "The path is not correct\n"
fi

# 3  
Old 02-13-2010
Quote:
Originally Posted by Franklin52
You're using the comparison operator for integers (-eq). To store the output in a variable, do something like:
Code:
#!/bin/sh

check=$(su - user1 -c "pwd")	# Store the output of this command in variable "check"

if [ "$check" == "/export/home" ]
then
  echo "The path is correct\n"
else
  echo "The path is not correct\n"
fi

Hi,

Yes i did that. but this happened.

Code:
./myscript: syntax error at line 2: `check=$' unexpected

# 4  
Old 02-13-2010
Try backticks:

Code:
check=`su - user1 -c "pwd"`

# 5  
Old 02-13-2010
Quote:
Originally Posted by Franklin52
Try backticks:

Code:
check=`su - user1 -c "pwd"`

Hi,

OMG i don't know why i didn't try this Smilie Thanks alot. There is another slight issue. Two extra lines always stored in variable "check". so how to remove first two lines of the variable data. following is the output when i echo "check"

Code:
Sun Microsystems Inc.     SunOS 5.9       Generic May 2002
You have new mail.
/export/home/rtp99      # this is the result of pwd command

# 6  
Old 02-13-2010
Quote:
Originally Posted by suhail.sadaqat
Hi,

OMG i don't know why i didn't try this Smilie Thanks alot. There is another slight issue. Two extra lines always stored in variable "check". so how to remove first two lines of the variable data. following is the output when i echo "check"

Code:
Sun Microsystems Inc.     SunOS 5.9       Generic May 2002
You have new mail.
/export/home/rtp99      # this is the result of pwd command

Code:
check=`su - user1 -c "pwd" | tail -1`

# 7  
Old 02-13-2010
Quote:
Originally Posted by Franklin52
Code:
check=`su - user1 -c "pwd" | tail -1`

Yes you are right Franklin, but this works only for the command having 1 line output like "pwd". I have to run other commands whose output length may vary. so how do i do some operations on the variable ("check" in this case)?
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