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Per country GET report, based on access log. Easy to transform to unique IP
the
find -printf "%f\n" prints just the file name from the given path. This means directory paths which contain extensions will not be considered.
See who is using a specific port. Especially when you're using AIX. In Ubuntu, for example, this can easily be seen with the netstat command.
Detect duplicate UID in you /etc/passwd (or GID in /etc/group file).
Duplicate UID is often forbidden for it can be a security breach.
Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.
list top committers (and number of their commits) of svn repository.
in this example it counts revisions of current directory.
Gives the same results as the command by putnamhill using nine less characters.
All with only one pipe. Should be much faster as well (sort is slow). Use find instead of ls for recursion or reliability.
Edit: case insensitive
If we want files with more than one extension, like .tar.gz, only appear the latest, .gz:
ls -Xp /path/to/dir | grep -Eo "\.[^./]+$" | uniq
If your grep doesn't have an -o option, you can use sed instead.
Once you get into advanced/optimized scripts, functions, or cli usage, you will use the sort command alot. The options are difficult to master/memorize however, and when you use sort commands as much as I do (some examples below), it's useful to have the help available with a simple alias. I love this alias as I never seem to remember all the options for sort, and I use sort like crazy (much better than uniq for example).
# Sorts by file permissions
find . -maxdepth 1 -printf '%.5m %10M %p\n' | sort -k1 -r -g -bS 20%
00761 drwxrw---x ./tmp
00755 drwxr-xr-x .
00701 drwx-----x ./askapache-m
00644 -rw-r--r-- ./.htaccess
# Shows uniq history fast
history 1000 | sed 's/^[0-9 ]*//' | sort -fubdS 50%
exec bash -lxv
export TERM=putty-256color
Taken from my http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html