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- sed '/^FOOBAR=/{h;s/=.*/=newvalue/};${x;/^$/{s//FOOBAR=newvalue/;H};x}' infile
- sed -i '/^'"$FOOBAR"'=/{h;s/=.*/=newvalue/};${x;/^$/{s//'"FOOBAR"'=newvalue/;H};x}' infile
- sed '/^FOOBAR=/{h;s/=.*/=$newvalue/};${x;/^$/{s//FOOBAR=$newvalue/;H};x}' infile
- sed '/^FOOBAR=/{h;s/=.*/="$newvalue"/};${x;/^$/{s//FOOBAR="$newvalue"/;H};x}' infile
- sed '/^FOOBAR=/{h;s/=.*/='"$newvalue"'/};${x;/^$/{s//FOOBAR='"$newvalue"'/;H};x}' infile
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