Shell Programming and Scripting

Guys,
I've a problem in the "sed" command used in my shellscripts

This is the problamatic line in my shell script:
sed -e 's/${line1}/${line1_m}/g' prod_hier_1234.txt > test.txt
It doesn't do the job of replacing the string stored in variable 'line1' to 'line1_m'.

However If I replace the line as below(by replacing the actual string)
sed -e 's/A,P,CMD,20-SEP-06,2006/A,P,CMD,20-SEP-06,20062814/g' prod_hier_1234.txt>test.txt
it works..

Could someone provide thougs about what could be the problem and the possible solution?

Thanks,
Bhagat

Hi,

I haven't tested it but don'y you have to double quote your sed scripting instead of single when using variables?
sed -e "s/${line1}/${line1_m}/g" prod_hier_1234.txt > test.txt

With
sed -e "s/${line1}/${line1_m}/g" prod_hier_1234.txt > test.txt
.....
It throws the error message "sed: Function s/ cannot be parsed."..
Oooops..

try the follwing

Code:

line1="abc"
line2="efg"
echo "sed -e 's/$line1/$line2/g' prod_hier_1234.txt > test.txt" > temp.sh
sh temp.sh
rm temp.sh

hope this works

Code:

sed -e 's/'${line1}'/'${line1_m}'/g' prod_hier_1234.txt > test.txt

error given:-

Code:

$ sed -e 's/'${line1}'/'${line1_m}'/g' prod_hier_1234.txt > test.txt
sed: -e expression #1, char 0: no previous regular expression

May be you have a expression which consists of many words. Try enclosing the entire expression in quotes and see. But I am not sure of this.