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Why SED can't see the last newline character?

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Top Forums Shell Programming and Scripting Why SED can't see the last newline character?
# 8  
Old 05-02-2011
Quote:
Originally Posted by kevintse
That newline you mentioned is not the last newline, the last newline is added automatically by sed when it outputs the line, you don't have control over this last newline.

Code:
kevin@kevin-laptop:~ $ cat data
aaa
bbb
ccc
ddd
eeee
 
kevin@kevin-laptop:~ $ sed 'N;$s/\n//' data | xxd
0000000: 6161 610a 6262 620a 6363 630a 6464 640a  aaa.bbb.ccc.ddd.
0000010: 6565 6565 0a                             eeee.
 
kevin@kevin-laptop:~ $ sed '{$H;x;s/\(.*\)\n\(.*\)/\1\2/;1d}' data | xxd
0000000: 6161 610a 6262 620a 6363 630a 6464 6465  aaa.bbb.ccc.ddde
0000010: 6565 650a                                eee.

As you can see from the output of the scripts you provided, the newline character(0a) is there.

Hmm ok I understand that you meant..
If the last line of the your a newline , as for I know (gnu) sed will add that newline to the output but delete all others..For this you can use tr command.

Code:
$ for i in $(sed "" file); do [ "$i" == "`sed -n " $(sed -n '$=' file) p" file`" ] && echo "$i"|tr -d '\n' || echo "$i"; done
aaa
bbb
ccc
ddd
eeee $

or

if it s has problem because of IFS
Code:
$ while read -r i ; do [ "$i" == "`sed -n " $(sed -n '$=' file) p" file`" ] && echo $i|tr -d '\n' || echo $i; done <file
aaa
bbb
ccc
ddd
eeee $

or

Code:
$ ax=$(sed ':a;$!N;$!s/\n/'\\\\n'/;ta;s/[\n]$//' file) && printf "$ax"
aaa
bbb
ccc
ddd
eeee $

regards
ygemici
Last edited by ygemici; 05-02-2011 at 06:50 AM..
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