Using Shell Variables in awk and sed

For sed - use double quotes around the variable.

sed '/'"$pattern"'/d' filename

Another option is to enclose entire sed command in double quotes.

sed "/$pattern/d" filename

For awk - use combination of double quotes single quotes double quotes

awk '{ if ($(1) == "'"$pattern"'" ) {print $2}}'

Optionally, you could create an awk variable from shell variable.

awk '{ if ($(1) == ipattern ) {print $2}}' ipattern=$pattern filename