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How to Glob files with Bash Extended Globbing?
To list all the files that match the regular expression “ab (2|3)+.jpg” you could do: Now that’s something you can’t do with regular globbing. Note: this matches files like ab2.jpg, ab3.jpg, ab2222.jpg, ab333.jpg, etc.
Which is the best syntax for Extended Globbing?
However, probably the most interesting extended globbing syntax is the “! (…)” syntax for matching everything except (ie not matching). But, be careful, this doesn’t always do what you might expect. For example, let’s list all the files that aren’t JPEGs or GIFs. One’s first thought might be something like this:
What’s the purpose of globbing in a file?
Globbing is mainly used to match filenames or searching for content in a file. Globbing uses wildcard characters to create the pattern. The most common wildcard characters that are used for creating globbing patterns are described below. Question mark – (?)
When to use a question mark in globbing?
Globbing is mainly used to match filenames or searching for content in a file. Globbing uses wildcard characters to create the pattern. The most common wildcard characters that are used for creating globbing patterns are described below. Question mark – (?) ‘?’ is used to match any single character.
Which is the best example of negation in Bash?
For a more complex negation example, let’s go back to the first example and list all the files that aren’t JPEG or GIF files and start with either “ab” or “def”. This is actually quite simple, we just take the first example and nest it inside of “!
How to restrict the set of matches in globbing?
There’s also the GLOBIGNORE variable: The GLOBIGNORE shell variable may be used to restrict the set of file names matching a pattern. If GLOBIGNORE is set, each matching file name that also matches one of the patterns in GLOBIGNORE is removed from the list of matches.
Why does Bash not match.jpg and.gif?
But that doesn’t work because the “.jpg” and the “.gif” of any file’s name end up getting matched by the “*” and the null string at the end of the file name is the part that ends up not matching the “! (…)” pattern. The correct syntax is:
Why does Bash not expand wildcards in Exec ( )?
This is rarely important except when you’re writing code and calling exec () and friends: if you don’t execute the program via bash any wildcards in the command line that you pass to exec () won’t get expanded. But these are not the only forms of wildcards supported by bash.