Replace all instances of a certain phrase with user defined macOS - macos

Question

I have a collection of different static .html files. I want to recursively look through all .html files in the current folder and:
replace all instances of image.jpg with a user string.
replace all instances of textBlock1 with another user string.
replace all instances of textBlock2 with a third user string.
where image.jpg/ textBlock1/ textBlock2 are the only ones looked for exactly as written e.g. not tExtblock1
How do I accomplish this using terminal? Must work on a fresh macOS install.
Previous answers do not use user input See: Recursive search and replace in text files on Mac and Linux

Answer 1

This little bash script should do as you wish. Save it as modhtml and make it executable, just necessary one time, with:
chmod +x modhtml
and then you can run it with:
./modhtml
Here is the script:
#!/bin/bash
echo -n "Enter string1: "
read str1
echo -n "Enter string2: "
read str2
echo -n "Enter string3: "
read str3
echo DEBUG: str1=$str1
echo DEBUG: str2=$str2
echo DEBUG: str3=$str3
# Find all files (not directories), in the current directory and below...
# ... called "*.html" and, for each one, execute "sed" to change...
# ... image.jpg to str1
# ... textBlock1 to str2
# ... textBlock2 to str3
find . -type f -name \*.html -print -exec sed -e "s/image.jpg/$str1/g" -e "s/textBlock1/$str2/g" -e "s/textBlock2/$str3/g" {} \;
As it stands, it tells you the names of the files it would change and how they will look afterwards but doesn't actually change anything.
If it looks good - make a copy of your files first then run it for real by changing the last line to:
find . -type f -name \*.html -exec sed -i.bak -e "s/image.jpg/$str1/g" -e "s/textBlock1/$str2/g" -e "s/textBlock2/$str3/g" {} \;
If you want the user to be prompted for the string via a GUI-style prompt, rather than in the Terminal, replace the first few lines like this:
#!/bin/bash
str1=$(osascript -e 'Tell application "System Events" to display dialog "Enter string1:" default answer ""' -e 'text returned of result' 2>/dev/null)
str2=$(osascript -e 'Tell application "System Events" to display dialog "Enter string2:" default answer ""' -e 'text returned of result' 2>/dev/null)
str3=$(osascript -e 'Tell application "System Events" to display dialog "Enter string3:" default answer ""' -e 'text returned of result' 2>/dev/null)
echo DEBUG: str1=$str1
echo DEBUG: str2=$str2
echo DEBUG: str3=$str3
It will look like this: