using perl -pi -e in shell script

[hlyeoh]

Hi,

Is there anyway to use variable in the following case?
The file is not able to update.

perl -pi -e 's/${seq_detail}/${new_seq}/g' ${SEQ_FILE}

alternatif, i try to use sed, but still the file is not updated.

sed -n -e 's/${seq_detail}/${new_seq}/g' ${SEQ_FILE}

Can anyone help to correct my statement above?
Thanks.

 

[Annihilannic]

Change the "s to 's.

Annihilannic.

 

[hlyeoh]

hi,

do you mean like this?
perl -pi -e 's./${seq_detail}/${new_seq}/g' ${SEQ_FILE}

 

[Annihilannic]

No, I mean like this:

[tt]perl -pi -e "s/${seq_detail}/${new_seq}/g" ${SEQ_FILE}[/tt]

Annihilannic.

 

[hlyeoh]

it works fine. Now it is updated, but it duplicate the result.

original :

Avnet FFS|00000000001
Avnet SCS|00000000001

After execute:
::::::::::::::
ref_id.dat
::::::::::::::
Avnet FFS|00000000002|Avnet FFS|00000000002
Avnet SCS|00000000001

 

[Annihilannic]

Can you post all of your code please, including where it sets the seq_detail and new_seq variables?

Annihilannic.

 

[hlyeoh]

Thanks Annihilannic, the problem solved. It is due to the pipe.

new_seq=${seq_code}"\\|"${t_seq_number_new}
perl -pi -e "s/${old_seq}/${new_seq}/g" ${SEQ_FILE}

 

[hlyeoh]

I was actually thinking why i can't get the same result using sed? Can sed use to substitute?
sed -i 's/${old_seq}/${new_seq}/g' ${SEQ_FILE} to replaces this statement
perl -pi -e "s/${old_seq}/${new_seq}/g" ${SEQ_FILE}

 

[Annihilannic]

Yes, but you will also need to use " quotes with sed. Otherwise the shell will not replace the ${variable} names with the variable contents.

Annihilannic.