Linux Tricks.txt

#Match multiple strings but keep part of the matched string in the final substitution. the \1 means to keep testing1 or testing2 when matched. So, if testing1=true is found, it will change to testing1=false.
sed 's/^\(testing1\|testing2\)=true/\1=false/' temp.txt

#awk
#Match starting at the end of the line
#Match fourth from last, second to last, and last
awk '{print $(NF-3),$(NF-1),$NF}'