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Add env variable in a file

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# 1  
Old 05-15-2011
Add env variable in a file
Hi,

I have a small requirement

Code:
set -x
`grep IMPACT_HOME=/opt/impact /opt/NETCOOLINST/r.txt | cut -d'=' -f2`
if [ "$?" = "1" ];
then
sed 's#IMPACT_HOME=[^ ]*#d' /opt/NETCOOLINST/r.txt
echo "IMPACT_HOME=" >> /opt/NETCOOLINST/r.txt
sed 's#IMPACT_HOME=[^ ]*#IMPACT_HOME=/opt/impact#g' /opt/NETCOOLINST/r.txt
fi

I want to do the following:

1. If the particular ENV variable IMPACT_HOME is not there in a file with the said path, I want add that variable with the path that is constant.
2. If the ENV variable IMPACT_HOME is already there then I want to remove it and add the path that I have decided.

How to do it?

Thanks & Regards,
Dinesh
# 2  
Old 05-15-2011
Try this

Code:
#1. If the particular ENV variable IMPACT_HOME is not there in a file
grep -q IMPACT_HOME infile || sed -i 'i IMPACT_HOME=/my/new/path' infile

#2. If the ENV variable IMPACT_HOME is already there then
grep -q IMPACT_HOME infile && sed -i 's!IMPACT_HOME.*!IMPACT_HOME=/my/new/path!g' infile

regards,
Ahamed
Last edited by ahamed101; 05-15-2011 at 02:33 PM..
# 3  
Old 05-23-2011
Hi Mate,

This does not seem to be working.

I just created a sample .bash_profile with no IMPACT_HOME variable and ran the command

Code:
grep -q IMPACT_HOME .bash_profile || sed -i 'i IMPACT_HOME=/my/new/path' .bash_profile

I see nothing gets added in this file

Also I checked the IMPACT_HOME variable is there it does not work.

Any other alternative how to do this.

Thanks for any help.

Regards,
Dinesh
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