This is a simple issue that trips me up every now and then. Let’s say you have a directory of a couple dozen themes all in zip files. It would be a pain to type “unzip filename.zip” for every single one, but when you do an “unzip *.zip” you get something like:
[root@hosting ~]# unzip *.zip
caution: filename not matched: file2.zip
caution: filename not matched: file3.zip
caution: filename not matched: file4.zip
You see the problem is that as command line runs, the * is processed redundantly via both unzip and the *nix CLI. In the end, it tries to extract from the first file it finds, all of the remaining files in the directory by name.
The trick to fix this is simple. Escape the * with a back slash when making the call. Then the * is passed as a character to unzip and nothing more. Like so:
[root@hosting ~]# unzip \*.zip
Escaping symbols and aliases is important in other circumstances as well. Every now and then a Linux command simply won’t work because the CLI has replaced text mid command with other text. I once couldn’t FTP in somewhere because the password was replaced before FTP could actually run. Escaping the symbols in the password involved would have allowed the connection to work..