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Shell Programming and Scripting

Unable to swap values

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# 1  
Old 07-01-2014
Unable to swap values

#!/bin/bash
pwd1=`cat 1.ini | grep -w PWD | cut -d'=' -f2` //value is /home/java/Desktop/sh_h
echo the value is `pwd`

pwd2=`cat 2.ini | grep -w PWD | cut -d'=' -f2` //value is /home/unix/Desktop/sh_h
echo the value is $pwd2

if [[ $pwd == $pwd2 ]]
then
echo both are same
else
pwd2=$pwd /* here i want to asign pwd2 value to pwd but its not happening. pls help men

fi
Last edited by anandpasunoori; 07-02-2014 at 10:46 PM.. Reason: added [/code] tags
# 2  
Old 07-01-2014
This is a classic programming exercise given to most 1st year IT students.

The answer is to use a temporary variable to keep the original pwd2 value:

Code:
if [[ "$pwd" == "$pwd2" ]]
then
    echo both are same
else
    temp_pwd=$pwd2
    pwd2=$pwd
    pwd=$temp_pwd
fi

Also note the quotes in the if statement these protect against errors that will arise if your PWD value contains spaces.
# 3  
Old 07-01-2014
really thanks alot for the reply. but i dont see the swap values in between pwd and pwd2, the value of pwd2 is copied to temo_pwd only. i see the same value in pwd.

pls help me on this.

---------- Post updated at 09:44 PM ---------- Previous update was at 09:41 PM ----------

this is the code i tired..

#!/bin/bash
pwd1=`cat 1.ini | grep -w PWD | cut -d'=' -f2`
echo the value is `pwd`

pwd2=`cat 2.ini | grep -w PWD | cut -d'=' -f2`
echo the value is $pwd2

if [[ "$pwd" == "$pwd2" ]]
then
echo both are same
else
temp_pwd=$pwd2
pwd2=$pwd
pwd=$temp_pwd

echo ------------------
echo the value is pwd is $pwd
echo the value is pwd2 is $pwd2
echo the value is temp_pwd is $temp_pwd
fi
# 4  
Old 07-02-2014
You could be deceiving yourself with the first echo statement which is printing your current directory using the pwd executable not the value of $pwd

Remember to use [code] and [/code] tags around your posted code to keep the format nice:

Code:
#!/bin/bash
pwd=`cat 1.ini | grep -w PWD | cut -d'=' -f2` 
echo "the value is $pwd"

pwd2=`cat 2.ini | grep -w PWD | cut -d'=' -f2` 
echo "the value of pwd2 is $pwd2"

if [[ "$pwd" == "$pwd2" ]]
then
  echo both are same
else
  temp_pwd=$pwd2
  pwd2=$pwd
  pwd=$temp_pwd

  echo ------------------
  echo the value is pwd is $pwd
  echo the value is pwd2 is $pwd2
  echo the value is temp_pwd is $temp_pwd
fi

# 5  
Old 07-02-2014
surround the variable names with curley braces
Code:
if [[ "${pwd}" == "${pwd2}" ]]
then
echo both are same
else
temp_pwd=${pwd2}
pwd2=${pwd}
pwd=${temp_pwd}
echo ------------------
echo the value is pwd is ${pwd}
echo the value is pwd2 is ${pwd2}
echo the value is temp_pwd is ${temp_pwd}
fi

# 6  
Old 07-02-2014
You are assigning to pwd1, but your are using pwd.
# 7  
Old 07-02-2014
Really thanks alot to Chubler_XL , SriniShoo and RudiC

it's working..

thanks............
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