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Top Forums Shell Programming and Scripting using field 2 in file2 to complete field 3 in file1 Post 302569924 by smarones on Wednesday 2nd of November 2011 04:25:48 AM
Old 11-02-2011
using field 2 in file2 to complete field 3 in file1

Hello,

I was hoping someone could help me with this work related problem...

basically what I want to do is the following:

file2:
Code:
1 o
2 t
4 f
5 v
7 n
8 e
10 a

file1:
Code:
1 :
2 :
3 :
4 :
5 :
6 :
7 :
8 :
9 :
10 :

Output:
Code:
1 : o
2 : t
3 :
4 : f
5 : v
6 :
7 : n
8 : e
9 :
10 : a

I am using "foreach" to implement this and it works fine when the number of lines is low, but when I hit numbers in the thousands the script becomes really slow.
I am sure there is a faster way of doing this using awk or sed but just dont know the command.
if you could also provide an explanation of the command that implements this I would appreciate it.


Thanks,

Moderator's Comments:
Mod Comment Please use code tags <- click the link!

Last edited by zaxxon; 11-02-2011 at 05:40 AM.. Reason: code tags, see PM
 

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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xzdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to cmp(1) or diff(1). If only one file is specified, then the files compared are file1 (which must have a suffix of a supported compression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom- pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp(1) or diff(1) is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2010-09-27 XZDIFF(1)
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