ls -l| egrep '^.*[0-9]{1,}:[0-9]{1,}' | tr -s " " | cut -d " " -f 8 |sed -r 's/^(..)..)/\2:\1/'

ls =list directory contents
-l = use a long listing format
egrep=print lines matching a pattern
'^.*[0-9]{1,}:[0-9]{1,}'=^ start of the line . .* whatever .
[0-9]{1,}one time or more.
just alone the ":"
after [0-9]{1,} again the same
tr =translate
-s = --squeeze-repeats
replace each input sequence of a repeated character that is listed in SET1 with a single
occurrence of that character
" " = empty
cut -d : irefered on previous post
-f =--fields=LIST
select only these fields; also print any line that contains no delimiter character, unless the -s
option is specified
8 = i dont know what here wants
sed=stream editor for filtering and transforming text
-r=--regexp-extended
''s/^(..)..)/\2:\1/'=
First : all this find times 2 numbers : 2numbers from anyline .What it does?
Second:I dont want to tired you there is any software online to make practise too sed,egrep etc?i dont want command from linux .

As with ALL of your other posts asking the same basic question, split it up!

There is absolutely NO reason you have to run that entire line all at once, every time, and guess at what it's doing.

Run the following, in order, and compare the output at each step to the previous to learn what the addition changed:

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Just for curiosity, which educational system might be responsible for the programmed breakdown during the process of problem-solution? Looks much like French, almost German.

The software would be on your computer. If you're stuck on a legacy OS instead, you can download and run a Live distro like Linux Mint. If you run in in the Live mode, it will run from the DVD will leave your hard drive alone. ( There used to be some sites offering BSD-based free shell accounts which would give you basic POSIX commands, but not the GNU ones used in the various Linux distros. I don't know of any for GNU/Linux but there might be. )

If you're looking at "sed" and "grep" then some background information would be regular expression pattern matching. Try these two sites for that:

http://www.grymoire.com/Unix/Regular.html
http://www.regular-expressions.info/quickstart.html

From there, "grep" is the simpler tool and you should look at it before "sed"

http://www.cyberciti.biz/faq/grep-regular-expressions/

For what it's worth, "egrep" is just a shortcut for plain old "grep" plus the -E option.

Last, look at "sed", but keep in mind that it is complex enough to have half a thick book dedicated to it alone. So you won't be able to get it all at once, but if you read, you will be able to pick up the basic enough to be able to use it.

https://www.digitalocean.com/communi...-text-in-linux