Learing perl oneliners. Can you give me some problems to solve.

bessarabov has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Learing perl oneliners. Can you give me some problems to solve. by Laurent_R (Canon) on Oct 02, 2014 at 17:29 UTC
You might also want to learn about the -p and -i command line flags. They are also very useful. A few easy things you could try: - Removing DOS carriage returns from a file under Unix (a sort of dos2unix utility) - Renaming in uppercase (or lowercase) all the files of a directory, checking first that the uppercase (or lowercase) version does not already exists. - Removing all comments from a Perl program - Crypting a file or a string in rot13 (each letter shifted by 13 positions in the alphabet), and decrypting it. - Listing all the modules installed in your Perl environment - Listing all the files in a directory, sorted by name / size / age or whatever other property you might want. - Changing the date format in a text file (for example from `MM DD, YYYY` to `YYYY-MM-DD` or vice-versa. - Printing the multiplication tables for numbers between 1 and 10.	[reply] [d/l] [select]
Re: Learing perl oneliners. Can you give me some problems to solve. by blindluke (Hermit) on Oct 03, 2014 at 08:32 UTC
I could add: Printing out all lines containing TODO/FIXME in a given file There is also a fairly recent book on the subject: Perl One Liners. And Perl White Magic is a wonderful thing to read. regards, Luke Jefferson	[reply]
Re: LearNing perl oneliNErs. 4 more problems. by Discipulus (Canon) on Oct 03, 2014 at 08:22 UTC
you may also try these: given a glob (like /var/log/accesslog) as argument print a descendant list of distinct occurences of the nth field, like IPs (BEGIN is your friend) given a filename print only the content between two words realize a mini calculator using the native math ability of Perl, print errors too format a given file to have line of n chars have fun! L There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l]
Re: Learing perl oneliners. Can you give me some problems to solve. by karlgoethebier (Abbot) on Oct 03, 2014 at 18:10 UTC
Some inspiration and some solutions: Famous Perl One-Liners Explained. Regards, Karl ŤThe Crux of the Biscuit is the Apostropheť	[reply]
Re: Learing perl oneliners. Can you give me some problems to solve. by Anonymous Monk on Oct 02, 2014 at 23:19 UTC
Your first task is, come up with a list of tasks that could be solved with oneliners :)	[reply]