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Full Discussion: NR==FNR confusions
Top Forums Shell Programming and Scripting NR==FNR confusions Post 302686663 by zaxxon on Wednesday 15th of August 2012 08:09:09 AM
Old 08-15-2012
Code:
awk 'NR==FNR{_[$2]=$0; next} _[$2] {print _[$2] "\t" $6}' f1 f2

NR has Number of the Record combined for all files given as input (16 Records). FNR just the Number of Records for the current file.

NR==FNR works like this:
Code:
$ awk '{print "NR:", NR " FNR:", FNR}' f1 f2
NR: 1 FNR: 1             <---- here starts f1
NR: 2 FNR: 2
NR: 3 FNR: 3
NR: 4 FNR: 4
NR: 5 FNR: 5
NR: 6 FNR: 1             <---- here starts f2
NR: 7 FNR: 2
NR: 8 FNR: 3
NR: 9 FNR: 4
NR: 10 FNR: 5
NR: 11 FNR: 6
NR: 12 FNR: 7
NR: 13 FNR: 8
NR: 14 FNR: 9
NR: 15 FNR: 10
NR: 16 FNR: 11

So when NR and FNR are not equal anymore, we must be in the second file f2. The next just helps, that the next following statement is not executed and so we just read in f1 into an associative array for later use, when we are in f2, (ie. when NR==FNR) is not true anymore.
Last edited by zaxxon; 08-15-2012 at 09:27 AM.. Reason: typo
 

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LEARN ABOUT SUSE

savetextmode

savetextmode(1) 						Svgalib User Manual						   savetextmode(1)

NAME

       savetextmode, textmode - save or restore the complete SVGA status for textmode.

SYNOPSIS

       savetextmode
       textmode

DESCRIPTION

       These  are  simple  scripts  to	save  the  SVGA  register  state  when	in  textmode  to the files /etc/vga/fontdata and /etc/vga/textregs
       ($HOME/.vga/fontdata and $HOME/.vga/textregs if directory /etc/vga is not writeable) or to restore it from these files.

       The actual utilities used are restorefont(1), restoretextmode(1), and restorepalette(1).

       The purpose of these scripts program is usually to recover from a crashed console due to an svgalib, Xfree or other program bug.

       You do this by being a smart guy and running savetextmode right after booting of your machine, prior to any problems.  Then,  in  case  the
       SVGA  state  is hosed and you sit in front of a blank or useless console, change VC (maybe login) to get to a shell. Or exist the currently
       running program with <Ctrl>-C, <Ctrl>-<Alt>-<Backspace>, or whatever applies. Once you got a shell, run textmode and it will hopefully ren-
       der your console useable again.

       To  make it clear: You do all this while not seeing anything on your console screen, you enter this information blindly or after logging in
       from a network. Also, if the keyboard is left in raw mode, nothing can really help you as you cannot enter  anything  which  a  shell  will
       understand.

FILES

       /etc/vga/fontdata or $HOME/.vga/fontdata
       /etc/vga/textregs or $HOME/.vga/textregs

SEE ALSO

       svgalib(7),  vgagl(7),  libvga.config(5),  dumpreg(1),  convfont(1),  fix132x43(1),  restorefont(1), restoretextmode(1), restorepalette(1),
       runx(1), setmclk(1),

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced utility as well as of  the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally  this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						    2 Aug 1997							   savetextmode(1)
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