A collection of useful command line tools

by Andrew Brampton 2009-2012

https://github.com/bramp/handy-tools

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persec.py

./persec.py [--interval=<n>] <command>

Runs a command at a set interval, and then displays numerical difference between refreshes. For example, persec.py ifconfig will display the standard ifconfig, with the bytes and packets numbers displayed in per second values.

wlan0  Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
       inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
       UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
       RX packets:539/s errors:0 dropped:0 overruns:0 frame:0
       TX packets:517/s errors:0 dropped:0 overruns:0 carrier:0
       collisions:0 txqueuelen:1000
       RX bytes:104971/s (0.10/s MB)  TX bytes:62267/s (0.06/s MB)

hist.py

cat something | ./hist.py

Reads a sequence of numbers from stdin, and produces a pretty histogram as well as various statistics such as the mean, median, 95th percentile.

  <=                               distibution                                count
1.92 ************************************************************************ 20
2.17 ******************                                                        5
2.42 **************                                                            4
2.67 ***                                                                       1
2.92                                                                           0
3.17 **********                                                                3
3.43 *******                                                                   2
3.68 ********************************                                          9
3.93 **************************************************                       14
4.18 ****************************************************************         18
4.43 *******************************************                              12
4.68 ******************************************************                   15
4.93 **************                                                            4
# N: 107, min: 1.67, max: 4.93, mean: 3.4557, var: 12.6348
# median: 3.8, 90%: 4.6, 95%: 4.63, 99%: 4.83

Licence

Copyright (c) 2009-2012, Andrew Brampton All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.