search & replace in matching files

reoccurring task:

• replace every occurence of FOO with BAR

• only in *.h and *.cpp files

  ag -G "\.(h|cpp)" FOO -l | xargs sed -i 's/FOO/BAR/g'

In this command I use ag -- the silversearcher

• ag -G allows you to narrow the search to certain file types
• -l will cause ag to only list files that contain the pattern