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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DIFF(1) General Commands Manual DIFF(1)
NAME
diff - print differences between two files
SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2
OPTIONS
-C n Produce output that contains n lines of context
-b Ignore white space when comparing
-c Produce output that contains three lines of context
-e Produce an ed-script to convert file1 into file2
-r Apply diff recursively to files and directories of
EXAMPLES
diff file1 file2 # Print differences between 2 files
diff -C 0 file1 file2
# Same as above
diff -C 3 file1 file2
# Output three lines of context with every
diff -c file1 file2 # Same
diff /etc /dev # Compares recursively the directories /etc and /dev
diff passwd /etc # Compares ./passwd to /etc/passwd
DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered"
Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If
the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same
name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special,
character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file
given on the command line, diff tries to compare the file with the same name as file in the directory directory.
SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1).
DIFF(1)