I saw this expression in a SOEN question, but I did not quite understand what it does.
for x in *;
do
echo $x;
done
This printed the list of folders in the directory I was in.
Is that what this expression is for?
What would be this * asterisco?
This, written the way it is, does the same thing as the command ls
* is being used as a wildcard.
Try this way:
for x in *.zip;do echo $x; done;
You can use the same rules you use in ls , for example:
for x in ./*/*.zip;do echo $x; done;
or
for x in /var/log/*.log;do tail $x; done;
As a practical example, the following code clears the contents of the logs in the development environment:
for x in /var/log/*.log;do echo '' > $x; done;
The asterisk indicates the reading of everything in the folder.
The variable X receives the names of the files individually, which are printed by the echo constructor.