Mastering Bash

Redirection to a file

Well, redirecting the output of a process is not what an IPC means, but it can be used as such in an asynchronous way: have one process redirect its output to a file and have another one read from the same file later on; and this can be a way to exchange information between the two processes:

zarrelli:~$ myfile=”myfile.txt” ; touch "$myfile" ; echo "$myfile" > controller ; while read -r line; do tar cvzf $line.tgz $line ; done < controllermyfile.txt

In this example, we just stored a filename into a variable. We created the file with touch, and then stored the filename into the controller file. Once we had the filename into the controller file, we had it read line by line and each line was stored into the line variable. ...