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Top Forums Shell Programming and Scripting awk - treating remaining columns as one Post 302731473 by only4satish on Thursday 15th of November 2012 08:04:49 AM
Old 11-15-2012
# cat t1
1 2 This is a comment

Code:
awk '{a=$1"\n"$2;sub(".*"$3,$3);print a"\n"$0}'  t1


sub(".*"$3,$3) replace in the current line ($0) everthing before and including $3 by the current value of $3
print a"\n"$0 print the variable a and the current line separated by a new line

by refering above file t1,current value of $3 is 'this' right ? , i am bit confused,could you please explain hw does this code works
Code:
sub(".*"$3,$3)

, will it returns the value 'this' or 'This is a comment'

please help me ............i am a newbie ..................

---------- Post updated at 06:34 PM ---------- Previous update was at 04:45 PM ----------

got it....
looks like above code does not give desired results, if the file contains string (this)which is repeated as below

# cat t1
1 2 This is a comment this is not a comment this this1

Code:
awk '{a=$1"\n"$2;sub(".*"$3,$3);print a"\n"$0}' t1

 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME
grub-render-label - generate a .disk_label for Apple Macs. SYNOPSIS
grub-render-label [OPTION...] [OPTIONS] DESCRIPTION
Render Apple .disk_label. -b, --bgcolor=COLOR use COLOR for background -c, --color=COLOR use COLOR for text -f, --font=FILE use FILE as font (PF2). -i, --input=FILE read text from FILE. -o, --output=FILE set output filename. Default is STDOUT -t, --text=STRING set the label to render -v, --verbose print verbose messages. -?, --help give this help list --usage give a short usage message -V, --version print program version Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
The full documentation for grub-render-label is maintained as a Texinfo manual. If the info and grub-render-label programs are properly installed at your site, the command info grub-render-label should give you access to the complete manual. grub-render-label (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-RENDER-LABEL(1)
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