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Full Discussion: need help using "join"
Top Forums UNIX for Dummies Questions & Answers need help using "join" Post 302163755 by H2OBoodle on Saturday 2nd of February 2008 07:12:41 AM
Old 02-02-2008
Well my assumptions on what you were trying to do were bad, so my awk solution didn't pan out for me. However I gave it a shot with a really short python script, and I think I may have what you need.

To be honest, you still didn't give me a clear idea of what you wanted your output to look like, so here's what I assumed. If I'm wrong, then sorry, this is my last shot.

Using the first four lines of your data, I think you want this output:
0060122450000 2000550
0060122450001 2000632
0060122450002 2001374
0060122450006 2004006

The first number is from file_a with the first four chars chopped off. The second number has the first value stripped off.

If this is correct, then here's a super simple python script to get that for you:

script name: foo.py

# open the data files
fa = open('file_a','rb')
fb = open('file_b','rb')

#Go through the files line by line stripping out just the parts
# that you want to keep. Also strip the newlines from the end.

for line in fa:
bita = line[4:].strip('\n')
tmpb = fb.readline().strip('\n')
# You could add a chk here to ensure tmpb matches bita. You'd have to do some additional chopping though. With millions of records, I'd do it.
bitb = tmpb[-7:]
print bita,bitb

# close the files
fa.close()
fb.close()

Run the script like this:
shellPrompt$ python foo.py

The script makes the assumption that your data files are matched up correctly, with the entries matching position-wise all the way through. If they're not, then this won't work without modifications. Your data will be wrong if the values are shifted.

And finally, there are probably more elegant python or shell techniques of doing this, but this works.

Good luck.
Last edited by H2OBoodle; 02-02-2008 at 08:18 AM.. Reason: give more info on how to run the script, warn on data corruption if data is not aligned.
 

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LEARN ABOUT SUSE

tk_nameofjoinstyle

Tk_GetJoinStyle(3)					       Tk Library Procedures						Tk_GetJoinStyle(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_GetJoinStyle, Tk_NameOfJoinStyle - translate between strings and join styles

SYNOPSIS

       #include <tk.h>

       int
       Tk_GetJoinStyle(interp, string, joinPtr)

       const char *
       Tk_NameOfJoinStyle(join)

ARGUMENTS

       Tcl_Interp *interp (in)		 Interpreter to use for error reporting.

       const char *string (in)		 String containing name of join style: one of "bevel", "miter", or "round".

       int *joinPtr (out)		 Pointer to location in which to store X join style corresponding to string.

       int join (in)			 Join style: one of JoinBevel, JoinMiter, JoinRound.
_________________________________________________________________

DESCRIPTION

       Tk_GetJoinStyle places in *joinPtr the X join style corresponding to string, which will be one of JoinBevel, JoinMiter, or JoinRound.  Join
       styles are typically used in X graphics contexts to indicate how adjacent line segments should be joined together.  See the X documentation
       for information on what each style implies.

       Under  normal circumstances the return value is TCL_OK and interp is unused.  If string does not contain a valid join style or an abbrevia-
       tion of one of these names, then an error message is stored in interp->result, TCL_ERROR is returned, and *joinPtr is unmodified.

       Tk_NameOfJoinStyle is the logical inverse of Tk_GetJoinStyle.  Given a join style such  as  JoinBevel  it  returns  a  statically-allocated
       string corresponding to join.  If join is not a legal join style, then "unknown join style" is returned.

KEYWORDS

       bevel, join style, miter, round

Tk																Tk_GetJoinStyle(3)
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