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Top Forums Shell Programming and Scripting Place , character after 3 digits from left to right in a string Post 302640077 by bakunin on Monday 14th of May 2012 05:09:53 AM
Old 05-14-2012
This is a very interesting problem. Perhaps the best (=simpliest) solution is the one from Scrutinizer and it is quite idle musing to try something in one tool (sed) which could be done a lot easier in another. Still, just to satisfy my curiosity:

Several posters here have suggested variants of the following algorithm: replace every three characters with these characters plus an appended comma. Reverse before and after this:

Code:
echo <number> | rev | sed -e 's/\(...\)/\1,/g' | rev

This may work but it is interesting to try to solve it in sed alone. It is possible to set up a loop appending the rightmost character to holdspace until the pattern space is empty. This would effectively do the same as the rev utility.

But there is a much simplier way to achieve our goal. Let us first apply our algorithm without using the rev utility. The outcome, depending on the length of the number, would be one of the following three forms:

Code:
1234   -> 123,4
12345  -> 123,45
123456 -> 123,456,

We can correct the first one by moving all the commata 2 places leftwards. The second variant can be corrected by moving the commata 1 place leftwards and the last line just has one superfluous comma in the end. Therefore:

Code:
echo 12345678901234 |\
sed 's/\(...\)/\1,/g
     /,.$/ {
          s/\(..\),/,\1/g
          }
     /,..$/ {
          s/\(.\),/,\1/g
          }
     s/,$//'

Which will do the trick in sed alone. My curiosity is satisfied indeed.

bakunin
These 2 Users Gave Thanks to bakunin For This Post:
 

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GIT-NAME-REV(1) 						    Git Manual							   GIT-NAME-REV(1)

NAME
git-name-rev - Find symbolic names for given revs SYNOPSIS
git name-rev [--tags] [--refs=<pattern>] ( --all | --stdin | <committish>... ) DESCRIPTION
Finds symbolic names suitable for human digestion for revisions given in any format parsable by git rev-parse. OPTIONS
--tags Do not use branch names, but only tags to name the commits --refs=<pattern> Only use refs whose names match a given shell pattern. --all List all commits reachable from all refs --stdin Read from stdin, append "(<rev_name>)" to all sha1's of nameable commits, and pass to stdout --name-only Instead of printing both the SHA-1 and the name, print only the name. If given with --tags the usual tag prefix of "tags/" is also omitted from the name, matching the output of git-describe more closely. --no-undefined Die with error code != 0 when a reference is undefined, instead of printing undefined. --always Show uniquely abbreviated commit object as fallback. EXAMPLE
Given a commit, find out where it is relative to the local refs. Say somebody wrote you about that fantastic commit 33db5f4d9027a10e477ccf054b2c1ab94f74c85a. Of course, you look into the commit, but that only tells you what happened, but not the context. Enter git name-rev: % git name-rev 33db5f4d9027a10e477ccf054b2c1ab94f74c85a 33db5f4d9027a10e477ccf054b2c1ab94f74c85a tags/v0.99~940 Now you are wiser, because you know that it happened 940 revisions before v0.99. Another nice thing you can do is: % git log | git name-rev --stdin GIT
Part of the git(1) suite Git 1.8.3.1 06/10/2014 GIT-NAME-REV(1)
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