11-12-2007
for eg there are two files to be compared
file1
1111 | universe
2222 |good
3333 |good
4444 |good
file2
1111 | universe
3333 |universe
2222 |good
4444 |good
the contents of both the files will be compared
row wise( i.e. row 1 content of file1 to be compared with row 1 content of file2 and so on)
if there is any difference/change in values (it can be numbers or those words) of
corresponding rows then the script will pick up the numbers of field one(f 1)
from file2 NOT file1.
like here the script should pick up 3333 and 2222 ( 2nd and 3rd positions values of file2) from file2 and redirect it to another to another third file.
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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)