09-19-2011
Copying lines from one file to another file
I did a search before posting and couldn't find an example of what I need done. Anyway, I have a file called file1.txt, which has data like this:
Quote:
M977
57 62 78 94 96 107
M998
53 12 99 23 56 32
M1117
61 62 01 92 33 14
File2.txt contains:
Quote:
T55
12
M977
53 12
T90
01 88
M1117
33 14
So what I need to do is from file1.txt find the first line M977 in file2.txt and replace the line below it with the line from file1.txt. So file2.txt would look like this.
Quote:
T55
12
M977
57 62 78 94 96 107
T90
01 88
M1117
33 14
I would need to loop though file1.txt and continue though each line. The next pass would fine M998 in file2.txt and change the line below it with the line from file1.txt. Hope this makes sense.
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JOIN(1) General Commands Manual JOIN(1)
NAME
join - relational database operator
SYNOPSIS
join [-an] [-e s] [-o list] [-tc] 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.
-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)