What is my ip?

2010-03-14 1 min read Bash

$ alias whatismyip="wget -q -O - <a href="http://whatismyip.com/automation/n09230945.asp"">http://whatismyip.com/automation/n09230945.asp" The preferred way for scripts (and easier to parse)

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by David Winterbottom (<a href="http://codeinthehole.com">codeinthehole.com)

URL: <a href="http://feedproxy.google.com/~r/Command-line-fu/~3/O6l8r0uDeTc/what-is-my-ip">http://feedproxy.google.com/~r/Command-line-fu/~3/O6l8r0uDeTc/what-is-my-ip

Some bashrc shorcuts for faster and profiecient directory browsing.

2010-03-10 1 min read Bash Linux

Here are some of the funtions that I have in my bashrc to make my life simple. They are not written by me but mostly taken from other places, but modified by me to some extent to suit my needs. If you know the original creator of these, let me know so I can add the attribution for the same.

This one is very useful.

.. (){
local arg=${1:-1};
local dir=””
while [ $arg -gt 0 ]; do
dir=”../$dir”
arg=$(($arg – 1));
done
cd $dir >&/dev/null
}
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Bash script to view log and config file in different server and paths.

2010-03-09 1 min read Bash

I was working on a project, where I need to open file from different servers and different paths. I do it with the command:

vim ftp://username@server/path/filename

This is okay when the path is short but when the path gets longer and I have different config files to open from the same path or their associated logs, then it becomes un-necessary typing. So, I did the following:

Have a file with some aliase’s like the below and source it from the bashrc file:

Bash histoy – common history in different terminals

2010-03-04 1 min read Bash Linux

I have been looking to do this for sometime. The bash history is per
session basis and the last session to quit overwrites the bash_history
file and thus all other terminals started between the time last terminal
lasted does not get to write the commands in the history file. Secondly
the history gets cluttered with lot of duplicate entries and entries
with ls and cd commands. So finally I added these to the bashrc file:

Bash Sub Shells

2010-03-02 1 min read Bash

Taken from <a href="http://www.linuxjournal.com/content/bash-sub-shells" target="_blank">here.

<span class=\"c\">#!/bin/bash</span>

server_cmd=server pid_file=$(basename $server_cmd .sh).pid log_file=$(basename $server_cmd .sh).log

( echo "Starting server" echo "Doing some init work" $server_cmd # server becomes a daemon

&lt;span class=\"k\">while &lt;/span>&lt;span class=\"nb\">true&lt;/span>

do if [[ -f $pid_file ]]; then sleep 15 else break fi done mail -s "Server exitted" joe@blow.com <<<CRAP

bash script with sql to get the number of records from multiple tables.

2010-02-10 1 min read Bash Database Learning Linux Solaris

Here is the bash script:

#!/bin/sh
names[1]=errorlog
names[2]=amit1log
names[3]=amit2log
names[4]=amit3log
names[5]=amit4log
j=1
echo $1
for i in $( sqlplus amit/passwd@tns @get_count.sql |sed -n ’/COUNT/,/Disconnected/p’|sed ’/COUNT/ d’|sed ’/—/ d’|sed ’/Disconnected/ d’|tr ’n’ ’ ’ )
do
temp=${names[$j]}
let count=30-${#temp}
for ((I=1; I <= $count ; I++))
do
printf ” ”
done
echo ”${names[$j]} : $i”
# echo $j
let j=j+1
done
echo
echo

and the required sql script:

select count() from errorlog;
select count() from amit1log;
select count() from amit2log;
select count() from amit3log;
select count(*) from amit4log;
quit;
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Splitting strings with IFS

2010-02-04 2 min read Bash Linux

Today I want to discuss splitting strings into tokens or “words”. I previously discussed how to do this with the <a href="http://bashcurescancer.com/reading-a-file-line-by-line.html">IFS variable and promised a more in depth discussion. Today, I will make the case on WHY to use IFS to split strings as opposed to using a subshell combined with <a class="zem_slink freebase/en/awk" title="AWK" rel="homepage" href="http://cm.bell-labs.com/cm/cs/awkbook/index.html">awk or cut.

I wrote this script which reads the /etc/password file line-by-line and prints the <a class="zem_slink freebase/en/user" title="User (computing)" rel="wikipedia" href="http://en.wikipedia.org/wiki/User_%28computing%29">username of any user which has a UID greater than 10 and has the shell of /sbin/nologin. Each test function performs this task 10 times to increase the length of the test:

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