Why SED can't see the last newline character? Post: 302518820

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Top Forums Shell Programming and Scripting Why SED can't see the last newline character? Post 302518820 by kevintse on Monday 2nd of May 2011 04:38:03 AM

05-02-2011

Registered User

Quote:

Originally Posted by ygemici

Code:

In default operation, sed cyclically copies a line of input, 
less its terminating newline character, into a pattern space (unless there is something left after a D command), 
applies in sequence all commands whose addresses select that pattern space, 
and at the end of the script copies the pattern space to standard output (except when -n is specified) and 
deletes the pattern space. Whenever the pattern space is written to standard output or a named file, 
sed will immediately follow it with a newline character

remove last newline you can use

Code:

sed 'N;$s/\n//' file

Code:

sed '{$H;x;s/\(.*\)\n\(.*\)/\1\2/;1d}' file

regards
ygemici

They don't work. as you cited the text, sed always appends a newline when it outputs a line of text, so I think there's no way of getting rid of the last newline character in sed.

kevintse

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LEARN ABOUT MINIX

gets

GETS(3) 						     Library Functions Manual							   GETS(3)

NAME

       gets, fgets - get a string from a stream

SYNOPSIS

       #include <stdio.h>

       char *gets(char *s)
       char *fgets(char *s, int n, FILE *stream)

DESCRIPTION

       Gets  reads  a string into s from the standard input stream stdin.  The string is terminated by a newline character, which is replaced in s
       by a null character.  Gets returns its argument.

       Fgets reads n-1 characters, or up through a newline character, whichever comes first, from the stream into the string s.  The last  charac-
       ter read into s is followed by a null character.  Fgets returns its first argument.

SEE ALSO

       puts(3), getc(3), scanf(3), fread(3), ferror(3).

DIAGNOSTICS

       Gets and fgets return the constant pointer NULL upon end of file or error.

BUGS

       Gets deletes a newline, fgets keeps it, all in the name of backward compatibility.

       Gets is not present in the Minix-vmd C library for reasons that should be obvious.  Use fgets instead.

7th Edition							   May 15, 1985 							   GETS(3)

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LEARN ABOUT MINIX

gets