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Full Discussion: Merging two files
Top Forums Shell Programming and Scripting Merging two files Post 302774003 by summer_cherry on Friday 1st of March 2013 03:56:27 AM
Old 03-01-2013
awk, perl, python

awk
Code:
gawk -F"[|]" '{
if(NR==FNR){
  _[$1]=sprintf("%s,%s",_[$1],$2)
}
else{
  tmp=_[$1]
  n=split(tmp,arr,",")
  for(i=2;i<=n;i++){
    print $0"|"arr[i]
}
}
}
' b a

perl
Code:
open my $fh1,"<a.txt" or die "can not open a.txt";
open my $fh2,"<b.txt" or die "can not open b.txt";
my %hash;
while(<$fh2>){
	chomp;
	my @tmp = split("[|]",$_);
	push @{$hash{$tmp[0]}}, $tmp[1];
}
close $fh2;
while(<$fh1>){
	chomp;
	my @tmp = split("[|]", $_);
	my @tmp = @{$hash{$tmp[0]}};
	for(my $i=0;$i<=$#tmp;$i++){
		print $_,"|",$tmp[$i],"\n";
	}
}
close $fh1;

python
Code:
dict={}
with open("b.txt","r") as f1:
 for line in f1:
  s=line.replace("\n","")
  items=s.split("|")
  if items[0] in dict:
   dict[items[0]].append(items[1])
  else:
   dict[items[0]]=[items[1]]
with open("a.txt","r") as f2:
 for line in f2:
  s=line.replace("\n","")
  items=s.split("|")
  for i in dict[items[0]]:
   print(s,"|",i,sep="")

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rmvb(9F)						   Kernel Functions for Drivers 						  rmvb(9F)

NAME
rmvb - remove a message block from a message SYNOPSIS
#include <sys/stream.h> mblk_t *rmvb(mblk_t *mp, mblk_t *bp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
mp Message from which a block is to be removed. mblk_t is an instance of the msgb(9S) structure. bp Message block to be removed. DESCRIPTION
The rmvb() function removes a message block (bp) from a message (mp), and returns a pointer to the altered message. The message block is not freed, merely removed from the message. It is the module or driver's responsibility to free the message block. RETURN VALUES
If successful, a pointer to the message (minus the removed block) is returned. The pointer is NULL if bp was the only block of the message before rmvb() was called. If the designated message block (bp) does not exist, -1 is returned. CONTEXT
The rmvb() function can be called from user, interrupt, or kernel context. EXAMPLES
This routine removes all zero-length M_DATA message blocks from the given message. For each message block in the message, save the next message block (line 10). If the current message block is of type M_DATA and has no data in its buffer (line 11), then remove it from the message (line 12) and free it (line 13). In either case, continue with the next message block in the message (line 16). 1 void 2 xxclean(mp) 3 mblk_t *mp; 4 { 5 mblk_t *tmp; 6 mblk_t *nmp; 7 8 tmp = mp; 9 while (tmp) { 10 nmp = tmp->b_cont; 11 if ((tmp->b_datap->db_type == M_DATA) && (tmp->b_rptr == tmp->b_wptr)) { 12 (void) rmvb(mp, tmp); 13 freeb(tmp); 14 } 15 tmp = nmp; 16 } 17 } SEE ALSO
freeb(9F), msgb(9S) Writing Device Drivers STREAMS Programming Guide SunOS 5.11 16 Jan 2006 rmvb(9F)
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