Ubuntu – How to use grep to find all the zip files in a directory

Here's the answer: For instance these are the texts inside the file

acpitz-virtual-0
Adapter: Virtual device
temp1:        +45.0°C  (crit = +90.0°C)
temp2:        +45.0°C  (crit = +90.0°C)

To get the +45.0°C of temp1, use this command:

grep temp1 < theFileWithTemp.txt | awk '{print $2}'

In Bash, a glob will not expand into hidden files, so if you want to search all the files in a directory, you need to specify hidden files .* and non-hidden *.

To avoid the "Is a directory" errors, you could use -d skip, but on my system I also get an error grep: .gvfs: Permission denied^†, so I suggest using -s, which hides all error messages.

So the command you are looking for is:

grep -s "string" * .*

If you are searching files in another dir:

grep -s "string" /path/to/dir/{*,.*}

Another option is to use the dotglob shell option, which will make a glob include hidden files.

shopt -s dotglob
grep -s "string" *

For files in another dir:

grep -s "string" /path/to/dir/*

† Someone mentioned that I shouldn't get this error. They may be right - I did some reading but couldn't make heads or tails of it myself.