12-11-2007
How to read content from a file and match with another file for operation
Hi,
I have somehow similar case of question like the above with some differences.
Basically I have 2 files, file A and file B.
In file A, I have columns of fields such that:-
aaa 107
bbb 108
ccc 109
In file B, I have columns of fields such that:-
101 2 1
102 3 1
107 2 1
108 3 1
109 2 1
I would like to know, if I would like to extract let say first element of file A and compare with file B elements.
If found, I would like to have the position of element 107 in file B in this case it is on 3rd line. And the same goes for other elements in file A which in the end will pipe to another output file.
Next, I would like to get the $2 and $3 of the 3rd line for some computation.
Currently, I tried to do below:-
#!/bin/sh
for i in a.txt
do
grep -c $i b.txt
cat b.txt| awk '
{
count[$i]=$2+$3;
}
END{
printf("%d",count[$i]);
}'
done
I knew it is not going work well as the second field of A.txt is not extracted.
Please advise. Thanks.
-Jason
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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)