File Globbing In Linux DistroTube
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Date: 2022-03-30
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Comments and reviews: 10
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I didn't know that you can use ! instead of -.
- still seems preferable to me because it's exactly the same syntax that will be needed when later learning regexps.
I understand why you might avoid getting into the translation between globbing/shell patterns, but I think the basic rules can be summarized pretty succinctly:
'-' in glob translates to '.-' ('any character' + '0 or more of') in regexp
'?' in glob translates to '.' ('any character'; without the '0 or more of' modifier, this matches exactly 1 character)
'[...]' in glob translates to .. exactly the same in regexp (with some exceptions relating mainly to the use of backslashes)
'[!...]' or '[-...]' in glob is as stated above, '[-...]' in regexp
. , (, ), $, - in glob (outside of a character class) should be prefixed with a backslash for regexp
One other thing I think maybe should be mentioned is that the subject you actually covered was _POSIX_ file globbing ('sh' / 'bash' without the 'extglob' option set), and other shells may have more (zsh, bash _with_ the extglob option set) or less (fish) sophisticated globbing available.
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I didn't know that you can use ! instead of -.
- still seems preferable to me because it's exactly the same syntax that will be needed when later learning regexps.
I understand why you might avoid getting into the translation between globbing/shell patterns, but I think the basic rules can be summarized pretty succinctly:
'-' in glob translates to '.-' ('any character' + '0 or more of') in regexp
'?' in glob translates to '.' ('any character'; without the '0 or more of' modifier, this matches exactly 1 character)
'[...]' in glob translates to .. exactly the same in regexp (with some exceptions relating mainly to the use of backslashes)
'[!...]' or '[-...]' in glob is as stated above, '[-...]' in regexp
. , (, ), $, - in glob (outside of a character class) should be prefixed with a backslash for regexp
One other thing I think maybe should be mentioned is that the subject you actually covered was _POSIX_ file globbing ('sh' / 'bash' without the 'extglob' option set), and other shells may have more (zsh, bash _with_ the extglob option set) or less (fish) sophisticated globbing available.
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Lawrence
As an exercise, how would you write a wildcard to match dotfiles in your home directory? These are the various files/directories containing user preferences for apps that you run. Their names begin with a dot, so they are normally excluded from directory listings. However, if you type something like -ls -ld -/.--, it will also show the useless -.- and -..- entries that clutter every Unix/Linux directory. How do you exclude these?
The answer is:
ls -ld -/.[!.]-
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As an exercise, how would you write a wildcard to match dotfiles in your home directory? These are the various files/directories containing user preferences for apps that you run. Their names begin with a dot, so they are normally excluded from directory listings. However, if you type something like -ls -ld -/.--, it will also show the useless -.- and -..- entries that clutter every Unix/Linux directory. How do you exclude these?
The answer is:
ls -ld -/.[!.]-
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Stoner
Back in the good old days, my parents got a computer. I think it was their first personal computer. my mom accidentally copied a chess game over a DOS install so whenever the pc booted it would run the chess game. She did some -copy -.-- command. It prompted my dad to become somewhat of a DOS guru so he could fix it. So because of this, I've known about wildcards and the dangers of haphazard commands since I can remember xD
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Back in the good old days, my parents got a computer. I think it was their first personal computer. my mom accidentally copied a chess game over a DOS install so whenever the pc booted it would run the chess game. She did some -copy -.-- command. It prompted my dad to become somewhat of a DOS guru so he could fix it. So because of this, I've known about wildcards and the dangers of haphazard commands since I can remember xD
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Terminalforlife
There's not just file globbing either, there's the standard globbing (can't remember it's name) you use, for example, in case statements.
Would be interesting to see you make a REGEX video, too. By the way, it's hard G, because re[g]ular expressions.
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There's not just file globbing either, there's the standard globbing (can't remember it's name) you use, for example, in case statements.
Would be interesting to see you make a REGEX video, too. By the way, it's hard G, because re[g]ular expressions.
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Ghislain
Always test you command with ls or select in SQL before you use wildcard so you sure it does what you want ! But it's a good reminder of the basic command. As always, Great Job, Derek !
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Always test you command with ls or select in SQL before you use wildcard so you sure it does what you want ! But it's a good reminder of the basic command. As always, Great Job, Derek !
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Wiki
Hey #distrotube would you please take a look on Extern Os( i just found that based on ubuntu but they haven't mention on any where on there page.) quite confusing Os(at least i think)
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Hey #distrotube would you please take a look on Extern Os( i just found that based on ubuntu but they haven't mention on any where on there page.) quite confusing Os(at least i think)
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Bruce
Nothing like Globbing to get some work done.. It is strange the names that Linux folks come up with... I just go with it as it is really neat! Thanks DT for the video!
LLAP
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Nothing like Globbing to get some work done.. It is strange the names that Linux folks come up with... I just go with it as it is really neat! Thanks DT for the video!
LLAP
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Lawrence
7:10 If you want to use regexes to match file names, you can do so with the -find- command. That-s a very useful command, by the way; worth doing an episode on, I think.
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7:10 If you want to use regexes to match file names, you can do so with the -find- command. That-s a very useful command, by the way; worth doing an episode on, I think.
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Youtubethecensor
I love the Matrix screensaver but stopped using them when I caught a trojan in one; know where I can get one that is clean? Thanks for the refresh on globs.
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I love the Matrix screensaver but stopped using them when I caught a trojan in one; know where I can get one that is clean? Thanks for the refresh on globs.
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SuperWolfkin
I mean why not just use commands like
>ls file[0-9].txt
it would show what's being filtered without you needing to remove files and retouch them.
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I mean why not just use commands like
>ls file[0-9].txt
it would show what's being filtered without you needing to remove files and retouch them.
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