I am using raspbian stretch, terminal window. superuser activated. In directory /var/log/apt the history.log.1.zg file is marked as gz format. I want to look for lines with the word install in them. I didn't necessarily want to uncompress the file. I executed the command gunzip history.log.1.gz | grep install My expectation was that the un zipped contents would be piped to grep which would filter for lines containing the word install. It changed the file to a decompressed version. I don't think it changed the contents. There was no terminal output. I gather I have to use -c I just wonder if a pipe might automatically be interpreted as providing the contents and leaving the original unchanged?
David Sent from ProtonMail mobile
