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Top Forums UNIX for Beginners Questions & Answers sed script to delete the last word after a last pattern match Post 303033236 by Don Cragun on Tuesday 2nd of April 2019 03:46:44 AM
Old 04-02-2019
Quote:
Originally Posted by kshitij
Hi Don

Thanks a lot for your reply! I am using Linux RH-6 .
If we need to match with the second last "/" and delete the lines from the second last "/
then how do we need to tweak the script. ?

Thanks
Kshitij
Hi Kshitij,
From your description above I have no idea which lines it is that you want to delete. In the first problem you presented in this thread you only wanted to remove characters from the end of each line. Now that you want to delete some lines, we need a clear specification of which lines you want to delete.

If you just want to remove another "/" character and the non-"/" characters from the ends of every line, I have already shown you how to do that. Why don't you show me how you would modify the code I suggested to delete the last two "/" characters and the non-"/" characters following them from the end of every line. Assuming that every line has at least two "/" characters (as in your example), there are at least three easy ways to do that.

If some lines might only contain one "/", you need to decide whether you want those lines to be changed at all (removing only the last "/" and the characters following it) or if you don't want to make any changes to a line if there aren't at least two "/" characters on the line. The way to do what you want to do depends on what it is that you want to do and on the data that you will be processing.
 

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PASTE(1)						    BSD General Commands Manual 						  PASTE(1)

NAME
paste -- merge corresponding or subsequent lines of files SYNOPSIS
paste [-s] [-d list] file ... DESCRIPTION
The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files still contain data, the file is treated as if it were an endless source of empty lines. The options are as follows: -d list Use one or more of the provided characters to replace the newline characters instead of the default tab. The characters in list are used circularly, i.e., when list is exhausted the first character from list is reused. This continues until a line from the last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste begins selecting characters from the beginning of list again. The following special characters can also be used in list: newline character tab character \ backslash character Empty string (not a null character). Any other character preceded by a backslash is equivalent to the character itself. -s Concatenate all of the lines of each separate input file in command line order. The newline character of every line except the last line in each input file is replaced with the tab character, unless otherwise specified by the -d option. If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly, for each instance of '-'. The paste utility exits 0 on success, and >0 if an error occurs. SEE ALSO
cut(1) STANDARDS
The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. BSD
June 6, 1993 BSD
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