Commands tagged sort

Finds files modified today since 00:00, removes ugly dotslash characters in front of every filename, and sorts them.

*EDITED* with the advices coming from flatcap (thanks!)

This command is more robust because it handles spaces, newlines and control characters in filenames. It uses printf, not ls, to determine file size.

Find top 5 big files

Get the longest match of file extension (Ex. For 'foo.tar.gz', you get '.tar.gz' instead of '.gz')

If you have GNU findutils, you can get only the file name with

instead of

Enhanced version: fixes sorting by human readable numbers, and filters out non MB or GB entries that have a G or an M in their name.

This is a modified version of the OP, wrapped into a bash function.

This version handles newlines and other whitespace correctly, the original has problems with the thankfully rare case of newlines in the file names.

It also allows checking an arbitrary number of directories against each other, which is nice when the directories that you think might have duplicates don't have a convenient common ancestor directory.

the -h option of du and sort (on appropriate distrib) makes output "Human" readable and still sorted by "reversed size" (sort -rh)

The lastb command presents you with the history of failed login attempts (stored in /var/log/btmp). The reference file is read/write by root only by default. This can be quite an exhaustive list with lots of bots hammering away at your machine. Sometimes it is more important to see the scale of things, or in this case the volume of failed logins tied to each source IP.

The awk statement determines if the 3rd element is an IP address, and if so increments the running count of failed login attempts associated with it. When done it prints the IP and count.

The sort statement sorts numerically (-n) by column 3 (-k 3), so you can see the most aggressive sources of login attempts. Note that the ':' character is the 2nd column, and that the -n and -k can be combined to -nk.

Please be aware that the btmp file will contain every instance of a failed login unless explicitly rolled over. It should be safe to delete/archive this file after you've processed it.

Count on a specific port (80) - FreeBSD friendly.

This sorts files in multiple directories by their modification date. Note that sorting is done at the end using "sort", instead of using the "-ltr" options to "ls". This ensures correct results when sorting a large number of files, in which case "find" will call "ls" multiple times.

"-exec" ftw.

This requires a version of GNU find that supports the -exec {} + action, but it seems more straightforward than the versions already posted.

The following displays only the entries that are duplicates.

Uniq command is mostly used in combination with sort command, as

uniq removes duplicates only from a sorted file. i.e In order for uniq to

work, all the duplicate entries should be in the adjacent lines.

ls -al gives all files, sort +4n sorts by 5th field numerically

Sort using kth column using : delimiter

cut -f1,2 - IP range 16

cut -f1,2,3 - IP range 24

cut -f1,2,3,4 - IP range 24

here's a version which works on OS X.