linux - How to append to a specific line using shell script? -


i have file (catalina.properties) specific line of:
common.loader="${catalina.base}/lib","${catalina.base}/lib/*.jar"

in environment looks this:
common.loader=

i need command appends part @ right side of equal sign, , works in both of 2 cases, result be:

common.loader="${catalina.base}/lib","${catalina.base}/lib/*.jar","${catalina.base}/extra/part.jar"

or in other case: 

common.loader="${catalina.base}/extra/part.jar"

sed solution:

exemplary test input file testfile:

common.loader="${catalina.base}/lib","${catalina.base}/lib/*.jar" common.loader= "ddd""sdsd" 
sed 's~common\.loader=.*~&,"${catalina.base}/extra/part.jar"~; s/=,/=/' testfile

the output:

common.loader="${catalina.base}/lib","${catalina.base}/lib/*.jar","${catalina.base}/extra/part.jar" common.loader="${catalina.base}/extra/part.jar" "ddd""sdsd"

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