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How to read a directory as parameter in shell script?

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# 1  
Old 10-10-2012
How to read a directory as parameter in shell script?
Hi All,

I have written a shell script to compile an oracle R12 form and also a procedure is called from it. The procedure registers the form, function and creates a menu entry.

I took directory as a parameter. Code is as below:
Code:
#!/bin/ksh
echo "**********************************************************************"
echo "Uploading Form"
echo "**********************************************************************"
 
#Assign default values
CUSTOM_FORM_PATH_DEFAULT=$PER_TOP/forms/US
 
echo "Enter Application Forms Path"
read CUSTOM_FORM_PATH 
if [[ -z ${CUSTOM_FORM_PATH} ]]; then 
  CUSTOM_FORM_PATH=${CUSTOM_FORM_PATH_DEFAULT} 
  echo "Default value ${CUSTOM_FORM_PATH} is considered"
fi 
 
if [ ! -d $CUSTOM_FORM_PATH ]; then 
  echo "Path not found"
  exit 1
fi
 
.............................................

When i give the complete path as /gl02libs/applvis/apps/apps_st/appl/per/12.0.0/forms/US it works.
But if i give as $PER_TOP/forms/US, it comes to the second if block and says path not found

Please suggest.

Thanks,
Veena
Last edited by Franklin52; 10-10-2012 at 04:27 AM.. Reason: Please use code tags for data and code samples
# 2  
Old 10-10-2012
You may use eval:
Code:
echo "Enter Application Forms Path"
read CUSTOM_FORM_PATH 
if [[ -z ${CUSTOM_FORM_PATH} ]]; then 
  CUSTOM_FORM_PATH=${CUSTOM_FORM_PATH_DEFAULT} 
  echo "Default value ${CUSTOM_FORM_PATH} is considered"
fi 

eval CUSTOM_FORM_PATH=$CUSTOM_FORM_PATH

if [[ ! -d $CUSTOM_FORM_PATH ]]; then 
  echo "Path not found"
  exit 1
fi

But, I would suggest that you take this path as an argument to your script than through read. That way, the shell will do the necessary variable expansion, if needed.
Last edited by elixir_sinari; 10-10-2012 at 04:57 AM..
This User Gave Thanks to elixir_sinari For This Post:
veena484
# 3  
Old 10-10-2012
Thanks elixir_sinari. It's working now.
# 4  
Old 10-10-2012
Problem: If a user inputs the parameter `rm -Rf ~/`, eval will execute that.

If you absolutely must cram a user-input string into eval, sanitize it first. Maybe remove all backslashes, backticks, and round brackets first.
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