Question

2

how to reverse the lower case characters in word using only sed

rated 0 times [ 2] [ 0] / answers: 1 / hits: 755 / 1 Year ago, sat, january 14, 2023, 4:00:10

Reverse every word of a line using sed

   Description

   -----------



   The job to do is reversing every word of a line.



   that a word is a sequence of lowercase alphabets



   Raw Input

   ---------



   112358 is a fibonacci sequence...

   a test line

   124816 1392781

   final line...



   Desired Output

   --------------



   112358 si a iccanobif ecneuqes...

   a tset enil

   124816 1392781

   lanif enil...

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2 Years ago

answered 1 Year ago giccolla · Accepted Answer

This sed script will do the job:

#!/usr/bin/sed



# Put a 

 in front of the line and goto begin.

s/^/

/

bbegin



# Marker for the loop.

:begin



# If after 

 is a lower case sequence, copy its last char before 

 and loop.

s/

([a-z]*)([a-z])/2

1/

tbegin



# If after 

 is not a lower case sequence, copy it before 

 and loop.

s/

([^a-z]*[^a-z])/1

/

tbegin



# Here, no more chars after 

, simply remove it before printing the new line.

s/

//