How to replace a word thr shell script

Hi,
I need a shell script which should read a file(a.txt)
and need to update the same file( means only replace a word with another one in the same file)
my unix version is SunOS and i am using ksh
could you pls provide me some better way.
My failured trails are as below
suppose a.txt file having data like,
column1 column2 column3
data1 data2 data3
and my script is,
#!/usr/bin/ksh
patha=/tmp
filea=a.txt
sed '/column2/s//column4/g' $patha/$filea > $patha/$filea
And also pls provide how to add data(data into new line) into file(a.txt)
Thanks in advance.

This is an Oracle SQL and PL/SQL forum.
If you want to learn how to write unix shell scripts I suggest you search the internet for a suitable unix forum.

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