replace.sh

function single_replace {
    python3 -c "import sys, re; print(re.sub(sys.argv[1], sys.argv[2], open(sys.argv[3]).read()))" "$@"
}

function multi_replace {
    python3 -c "import sys, re; t=open(sys.argv[1]).read();
for i in range(2, len(sys.argv)-1, 2):
  t=re.sub(sys.argv[i], sys.argv[i+1], t)
print(t, end='')" "$@"
}