[vorakl]

Interesting! I just wonder... How would you do a conditional branching in sed?

[chasil]

There is a conditional branch instruction in sed that is taken if the last substitute command was successful.

The O'Reilly book on sed & awk is available online for free from various sources (I grabbed a rar archive of it from somewhere).

https://freecomputerbooks.com/The-Unix-CD-Bookshelf-Version-...