UNIX for Dummies Questions & Answers

#!/usr/bin/python
import os,glob
def arrange(filename):
   seen = {}
   for line in open(filename):
      line = line.strip().split(' ',1)
      key,val = line[0], line[1]
      if not seen.has_key( key ):
         seen[key] = [val]
      else:
         seen[key].append(val)
   return seen

os.chdir("/test")
for fi in glob.glob("*.txt"):
   if os.path.isfile(fi):
      d = arrange(fi)
      o = open("temp","a")
      for i,j in d.iteritems():
         o.write("%s %s\n" % (i,' '.join(j)) )
      o.close()
      os.rename("temp",fi)

awk ' { a=$1;sub($1,"",$0) ;arr[a]=arr[a] $0 } 
END { for( key in arr ) print key arr[key] } ' file

awk '{ if( prev == $1 ) { for( i=2; i<=NF; i++ ) { printf "%s ", $i }; } else { printf "\n"; prev = $1; for( i=1; i<=NF; i++ ) { printf "%s ", $i } } }END { print "\n"} ' filename