I have a list of items in 2 files. Some items are present in both the files in any order. Say for example item name is 'apple', it may be present in line 2 of file 1 and line 10 of file 2.
I want to see the missing items only. In simple terms, Items present in file1 if not in file2 then output the missing items to another file as "<itemname> not in file2.
thanks
Two ways in perl:
Code:
file1:
apples
pears
oranges
Code:
file2:
apples
Code:
m1.pl
#!/usr/bin/perl
while (<>) {
chomp;
if ($ARGV=~/file2/) {
$keys{$_}++;
} else {
print "$_\n" if (! $keys {$_});
}
}
$ ./m1.pl file2 file1
pears
oranges
Code:
m2.pl
#!/usr/bin/perl
open FILE, "< $ARGV[1]" or die "Can't find $ARGV[1]: $!";
while (<FILE>) {
chomp;
$keys{$_}++;
}
close FILE;
open FILE, "< $ARGV[0]" or die "Can't find $ARGV[0]: $!";
while (<FILE>) {
chomp;
print "$_\n" if (! $keys {$_});
}
close FILE;
$ ./m2.pl file1 file2
pears
oranges
Personally, I prefer methods like these over sort because they can process millions and millions of records in both files very fast passing through each set only once.
I have file1 and file2:
file1:
11 xxx kksd ...
22 kkk kdsglg...
33 sss kdfjdksa...
44 kdsf dskjfkas ...
hh kdkf kdkkd..
jg dkf dfkdk ...
...
file2:
jg
22
hh
...
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file1
123456789 2012
987654321 2011
a1234567892012
a1234abcde2012
b1234567892012
c1234567892012
98765a12342012
file2
a1234
01234
b1234
33333
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File 1
One
Two
Three
Four
Five
File 2
One
Three
Four
Six
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File1:
DB1|TB1|C1,C3
DB2|TB2|C1,C2
DB3|TB3|C1,C2,C3,C4
File2:
... (2 Replies)
Discussion started by: Selva_2507
2 Replies
LEARN ABOUT ULTRIX
mv
mv(1) General Commands Manual mv(1)Name
mv - move or rename files
Syntax
mv [-i] [-f] [-] file1 file2
mv [-i] [-f] [-] file... directory
Description
The command moves (changes the name of) file1 to file2.
If file2 already exists, it is removed before file1 is moved. If file2 has a mode which forbids writing, prints the mode and reads the
standard input to obtain a line. If the line begins with y, the move takes place. If it does not, exits. For further information, see
In the second form, one or more files (plain files or directories) are moved to the directory with their original file-names.
The command refuses to move a file onto itself.
Options
- Interprets all following arguments as file names to allow file names starting with a minus.
-f Force. This option overrides any mode restrictions or the -i switch.
-i Interactive mode. If a move is to supersede an existing file, the system prompts youw with the name of the file fol-
lowed by a question mark. If you type a string that begins with y, the move occurs. If you type any other response,
the move does not occur.
Restrictions
If file1 and file2 lie on different file systems, must copy the file and delete the original. In this case the owner name becomes that of
the copying process and any linking relationship with other files is lost.
See Alsocp(1), ln(1)mv(1)