Thanks to antville.org

scrolling in screen

shantanuo — Thu, 28 Jun 2012 05:07:17 GMT

We can not scroll up or down while working in screen mode. Press Ctrl-a, Esc to enter copy mode, then use standard navigation keys. Adding the following to ~/.screenrc will solve this issue.termcapinfo xterm|xterms|xs|rxvt ti@:te@

or add this to /etc/screenrcdefscrollback 1024

hardstatus onhardstatus alwayslastlinehardstatus string "%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %H %{..Y} %m/%d %C%a "

As a quick tip, name your screen windows using Ctrl-a A

Curling PHP

shantanuo — Thu, 17 Feb 2011 04:46:00 GMT

CURL can be used very effectively using PHP. Here is an example.

cat curl.php

Counting file types

shantanuo — Mon, 11 Jan 2010 13:13:46 GMT

cat myawk.sh#!/bin/sh

list the type of files with count

find ${*-.} -type f -print | xargs file |awk '{$1=NULL;t[$0]++;}END {for (i in t) printf("%d\t%s\n", t[i], i);}' | sort -nr

Easy SSH

shantanuo — Fri, 18 Dec 2009 09:13:10 GMT

HashKnownHosts noAdd the above line in your ssh_config file that can be found here..../etc/ssh/ssh_config

Old date in Shell

shantanuo — Tue, 11 Aug 2009 07:20:01 GMT

If you need to know the 3 days old date, it easy in shell.

$ v_prev_date=date --date='3 days ago' +%Y%m%d

$ echo $v_prev_date20090808

Number all lines in a file

shantanuo — Sun, 09 Aug 2009 06:46:05 GMT

perl -pe '$_ = "$. $_"'

“-p” causes Perl to assume a loop around the program (specified by “-e”) that reads each line of input into the ” $_ ” variable, executes the program and then prints the ” $_ ” variable. In this one-liner I simply modify ” $_ ” and prepend the ” $. ” variable to it. The special variable ” $. ” contains the current line number of input.The result is that each line gets its line number prepended.

awk power

shantanuo — Mon, 04 May 2009 14:37:12 GMT

$ cat salariesYvette van der Hoff 100000Sarack Abama 400000Bernie Madoff 0John Q. Public 20000

$ awk '{print $NF, $0}' salaries | sort -nr -k1,1 | cut -d" " -f2-Sarack Abama 400000Yvette van der Hoff 100000John Q. Public 20000Bernie Madoff 0

$ awk -F '\t' -v 'OFS=\t' '{print $4, $3, $5, $2, $1}' data.txtPOP.COUNTYGOVT.CITYSTATE123GilaMayorElyAZ345LoloSheriffAlmaCA22El PasoBubbaLeroyTX

Declare your assets!

shantanuo — Sun, 01 Mar 2009 13:18:14 GMT

The declare command can be helpful in identifying variables, environmental or otherwise. This can be especially useful with arrays.

bash$ declare | grep HOME/home/bozo

bash$ zzy=68bash$ declare | grep zzyzzy=68

bash$ Colors=([0]="purple" [1]="reddish-orange" [2]="light green")bash$ echo ${Colors[@]}purple reddish-orange light greenbash$ declare | grep ColorsColors=([0]="purple" [1]="reddish-orange" [2]="light green")