Bash: replacing a substring in pipe stdin

Question

I try to replace a certain substring from the stdin with a new substring. I have to get the stdin from the pipe, after reading several files by cat. Then I want to

Answer 1

You can use the command sed.

cat file1 file2 | sed -e 's/@path_to_file/path/to/file/' ...

Answer 2

With Parameter Expansion:

cat file1 file2 | while read -r line; do echo "${line/@path_to_file/path\/to\/file}"; done