NULL Search String & File Name


 
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# 1  
Old 09-06-2011
NULL Search String & File Name

Hi All,

I am writting a Sell Script, that takes Search String & File Name from the terminal and check for Null Status. If either is NULL then pgm should quit.


I wrote the following:

Code:
bash-3.2$ cat null_status_of_parameters.sh
#!/bin/sh
#WASS that takes Search String & File Name from the terminal and check for Null Status. If either is NULL then pgm should quit.
echo "Please Enter the Search String:"
read pat
if [ -Z $pat ]
  then
     echo "Pattern entered is Empty"
     exit
  else
       echo "Please enter the File name:"
       read file
     if [ -Z $file ]
        then
           echo "File name not passed"
           exit
        else
           echo "Following is the grepped output:"
           grep $pat $file
      fi
fi
bash-3.2$


Output:

Code:
bash-3.2$ ./null_status_of_parameters.sh
Please Enter the Search String:
Manish
./null_status_of_parameters.sh: line 8: [: -Z: unary operator expected
Please enter the File name:
text_file
./null_status_of_parameters.sh: line 15: [: -Z: unary operator expected

Following is the grepped output:

Code:
Hi all.... I am Manish, I am learning UNIX.
bash-3.2$



Could anyone please let me know why I am getting the error (highlighted in red above) even I am getting the desired output.

Many thanks in advance.

Thank you,
Manish

Last edited by radoulov; 09-06-2011 at 07:47 AM.. Reason: Code tags.
# 2  
Old 09-06-2011
Hi,

It should be small "z"
Code:
if [ -z $pat ]

# 3  
Old 09-06-2011
It worked file now. Thank you very much.
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