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sed: command garbled - when executed with $variables

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# 1  
Old 05-11-2009
sed: command garbled - when executed with $variables
I have got a file job_tree.lst , which contains 1 line as below

$ cat job_tree.lst
ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

I want to get a child job string 3 characters offset from the parent job string (i.e. ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0 available in job_tree.lst)
The command I am using in shell script to carry out the above task is as below

grep $parent job_tree.lst | tail -1 |sed -e 's*'${parent_job_rep}'*'' '${child_job_rep}'*'

but it's producing an error “SED command: Command Garbled error”

Pl see the test below what I have done in the command prompt

$ cat job_tree.lst
ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

$ echo $parent
ABC_D_EQ_XXXXX_YYYY_PRD_UX

$ echo $child_job_rep
XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

$ echo $parent_job_rep
ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

$ grep $parent job_tree.lst | tail -1 |sed -e 's*'${parent_job_rep}'*'' '${child_job_rep}'*'
sed: command garbled: s*ABC_D_EQ_XXXXX_YYYY_PRD_UX

But when I give literals in place of substitution variables , it's working see below

$ grep $parent job_tree.lst | tail -1 |sed -e 's*ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0* XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0*'
XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

Can the experts help?

Thanks
# 2  
Old 05-11-2009
Code:
echo 'ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0' | sed -e "s|$parent_job_rep|$child_job_rep|g"

XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0
# 3  
Old 05-11-2009
echo 'ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0' | sed -e "s|$parent_job_rep|$child_job_rep|g"

This is working , but when I add grep... instaed of echo , sed does not substitute the string with child_job_rep.See the result below. Any clues ?

$ grep $parent job_tree.lst | tail -1|sed -e "s|$parent_job_rep|$child_job_rep|g"
ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0
# 4  
Old 05-11-2009
devtakh,
Any suggestions for the above issue?
Thanks
# 5  
Old 05-11-2009
Code:
$ child_job_rep='XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 I
N 13412850/0'

$ parent_job_rep='ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50
IN 13412850/0'

$ grep $parent file| tail -1
ABC_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

$ grep $parent ftree | tail -1 | sed -e "s|$parent_job_rep|$child_job_rep|g"
XYZ_D_EQ_XXXXX_YYYY_PRD_UX 05/08/2009 05:47 05/08/2009 05:50 IN 13412850/0

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