some strange problem with return data in sctipt

sukhdip · 01-04-2012, 05:18 AM

Hi,
I have come across a little strange problem in my script. i tried the same logic in some other script where its working fine. but in other script its not behaving as expected.
Here is the code:

Code:

#!/bin/bash

run_count="2"   
catalog_name="demo"
cd /root/Test_project/Files/$catalog_name
for file in $run_count"_"*.csv; do
 echo $file
 file_count=`grep -c "." $file`
 echo $file_count"file_count \n"
 FILE_NAME=$run_count"_"$catalog_name"_Row_Count.prop"
 PROP_KEY=$file
 Count_file=$(awk -F"=" '{ ()print $1; }' $FILE_NAME )
 echo "file count= "$Count_file
 Count=`cat ${FILE_NAME} | grep ${PROP_KEY} | cut -d'=' -f2`

 echo $Count  #[Here its working fine, its showing the correct values which is returned from top]
 echo $Count"hi" #[here if i'm printing something with it then the value of $Count is lost. and its only printing hi] don't know why
 
#and based on that furhter logic is not working which is under if

if [ "$Count" == "$file_count" ]; then
 echo "column header count row proper"
 else
 echo "Error send a mail as count is not correct in "$file
 exit 1
fi
done
exit 0

My question is this
1. Why the value is lost of $Count when am trying to print something with it.
2. Is there any problem of data type?
3. What type of datatype is returned by cut command in above?
Here I need to return integer and then to compare them
Count is the number of files, which is specified in a property file from where its picking in above case.
file_count is number of rows in a file.

I need to compare them both and then have to take action further.
Help me out if there is something wrong with data type or logic or something else.

Thanks,

unSpawn · 01-04-2012, 08:25 AM

The value of $Count is lost because you used an unprotected variable name ($Count"hi" instead of "${Count}hi"). To find out which values get assigned run the script as '/bin/bash -vx /path/to/script'. To compare integers you can use [ $Count == $file_count ] or [ $Count -eq $file_count ].

You should not test scripts as root user and not use unprotected, odd case or inconsistently named variable names.

Code:

function help() { echo "Bash scripting guides:
http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html 
http://www.tldp.org/LDP/Bash-Beginners-Guide/html/index.html 
http://www.gnu.org/software/bash/manual/html_node/index.html
http://www.grymoire.com/Unix/Sh.html
http://www.tldp.org/LDP/abs/html/ 
http://wooledge.org/mywiki/BashFAQ?action=show&redirect=BashFaq 
http://wooledge.org/mywiki/BashPitfalls"; }