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Full Discussion: string operation
Top Forums Shell Programming and Scripting string operation Post 302096998 by fongthai on Tuesday 21st of November 2006 04:49:58 AM
Old 11-21-2006
string operation
Hi all,

Here is my situation.

I have a text file TXT_FILE like this:
john 123456
jack 94589
kelvin 94595
mary 88585

I want to read the first word in each line ( the name ) and assign to a string variable ( EX_LIST ) in my script so that I can use later as this command
Code:
for i in $EX_LIST ; do ...

This is my complete script:
Code:
 #!/bin/sh

EX_LIST=' '
TXT_FILE=./my_file.txt

get_first()
{
        cat $TXT_FILE |while read line
        do
                first_word=`echo $line | awk '{print $1}'`
                echo This is first word: $first_word
                tmp_list=$EX_LIST
                echo This is temp list: $tmp_list
                EX_LIST=$tmp_list" "$first_word
                echo update new list: $EX_LIST
                echo ======***======
        done
        echo $EX_LIST
}

get_first

echo Printing out the result:
for nn in $EX_LIST ; do
        echo item: $nn
done
echo done!

And this is the result of my script:
Code:
This is first word: john
This is temp list:
update new list: john
======***======
This is first word: jack
This is temp list: john
update new list: john jack
======***======
This is first word: kelvin
This is temp list: john jack
update new list: john jack kelvin
======***======
This is first word: mary
This is temp list: john jack kelvin
update new list: john jack kelvin mary
======***======

Printing out the result:
done!

The problem as you can see is it does not echo anything of my for command. (Printing out the result:)
can anyone help to correct it ?
Thank you!
 

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