"sort_csn" is a function to sort a comma separated list of numbers.

Define the the function with this:

sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; }

Use the function like this:

sort_csn 443,22,80,8200,1533,21,1723,1352,25

21,22,25,80,443,1352,1533,1723,8200

One example where this is useful is when port scanning with nmap and getting a list of open ports in random order. If you use Nessus, you may need to create a scan policy for that set of specific ports and it is clearer to read with the port numbers in ascending order (left to right).

Caveat: no spaces in the comma separated list (just number1,number2,number3,etc).

A variation of this to sort a comma separated list of strings:

sort_css () { echo "${1}" | sed -e "s/,/\n/g"| sort -u | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; }

usage:

sort_css apples,pears,grapes,melons,oranges

apples,grapes,melons,oranges,pears

Where COMMAND is the process(es) name. I prefer to get all states but you may add ESTABLISHED in the grep regex.

-nP flags are optional and UDP is irrelevant for established connections

Similar but using the process id:

Counts the frequency of words in a file

This one-liner will output installed packages sorted by size in Kilobytes.

Show the top file size in human readable form

Show the top 10 file size

list top committers (and number of their commits) of svn repository.

in this example it counts revisions of current directory.

Also:

* find . -type f -exec ls -s {} \; | sort -n -r | head -5

* find . -type f -exec ls -l {} \; | awk '{print $5 "\t" $9}' | sort -n -r | head -5

Little faster alternative.

perl-less way

du -m option to not go across mounts (you usually want to run that command to find what to destroy in that partition)

-a option to also list . files

-k to display in kilobytes

sort -n to sort in numerical order, biggest files last

tail -10 to only display biggest 10

This command finds all of the functions defined in any shell script you specify including .bashrc

Directories listed in human-readable format

Inspired by #7065

So your boss wants to know how much memory has been assigned to each virtual machine running on your server... here's how to nab that information from the command line while logged in to that server

This command allows you to find the effective uid and gid of the Apache process regardless of process name (which can be apache2 or httpd depending on distro).