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Top Forums Shell Programming and Scripting grepping all lines of one file from another file Post 302328101 by durden_tyler on Tuesday 23rd of June 2009 10:43:37 AM
Old 06-23-2009
Quote:
Originally Posted by nampahc
...
I need to grep the second file for all lines that contain one of the lines from file 1

so at the end i will be left with a line from file 2 that coresponds to each entry in file 1
...
Code:
$
$ cat file1
1
5
3
$
$ cat file2
1 this line has 1
5 this line has 5
4 this line has 4
2 this line has 2
3 this line has 3
$
$ perl -ne 'BEGIN {open(F1,"file1"); while(<F1>){chomp; $x{$_}=1} close(F1)}
           {split; print if $x{$_[0]}==1}' file2
1 this line has 1
5 this line has 5
3 this line has 3
$
$

tyler_durden
 

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JOIN(1) 						      General Commands Manual							   JOIN(1)

NAME
join - relational database operator SYNOPSIS
join [ options ] file1 file2 DESCRIPTION
Join forms, on the standard output, a join of the two relations specified by the lines of file1 and file2. If file1 is `-', the standard input is used. File1 and file2 must be sorted in increasing ASCII collating sequence on the fields on which they are to be joined, normally the first in each line. There is one line in the output for each pair of lines in file1 and file2 that have identical join fields. The output line normally con- sists of the common field, then the rest of the line from file1, then the rest of the line from file2. Fields are normally separated by blank, tab or newline. In this case, multiple separators count as one, and leading separators are dis- carded. These options are recognized: -an In addition to the normal output, produce a line for each unpairable line in file n, where n is 1 or 2. -e s Replace empty output fields by string s. -jn m Join on the mth field of file n. If n is missing, use the mth field in each file. -o list Each output line comprises the fields specified in list, each element of which has the form n.m, where n is a file number and m is a field number. -tc Use character c as a separator (tab character). Every appearance of c in a line is significant. SEE ALSO
sort(1), comm(1), awk(1) BUGS
With default field separation, the collating sequence is that of sort -b; with -t, the sequence is that of a plain sort. The conventions of join, sort, comm, uniq, look and awk(1) are wildly incongruous. 7th Edition April 29, 1985 JOIN(1)
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