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Web Application Deployment module A167
Shell Programming (bash)
Exercises, examples and other material relating to training module A167. This topic is presented on public courses Deploying LAMP - Linux, Apache, MySQL, Perl/PHP, Linux Basics, Deploying Java Applications on Linux / Unix




Articles and tips on this subjectupdated
4587shell - bash. Writing conditional tests and statements - the options available
Every language that I teach has conditionals and loops, and the bash shell is no exception. From the three day bash course given last week - an example including lots of alternative tests (but by no means all varlients! for tests in if   if command ... ; then The command is run and its ...
2015-11-28
 
4586Extending your bash shell with aliases, functions and extra commands
Want a command to do some composite job, but it doesn't exist? You can add new commands into your bash script using functions ... see example [here] from last week's course. aliases ... here are the aliases that I'm using to provide my own extra / modified commands on our web server:   -bash-4.1$ ...
2015-11-28
 
4584Bash ... some new scripts to - handling user input
I just completed a three day "bash shell programming" course and have uploaded a whole host of new examples, and updated some older ones too. Here are some examples that relate to inputting from STDIN ... further links to other groups of new examples to follow Asking a question and read from STDIN ...
2015-11-27
 
4487Starting MySQL. ERROR! The server quit without updating PID file - how we fixed it.
Our MySQL databases are backed up frequently, and I've arranged for our server to email me in the event of a failure. From our /bin/bash script which is run by crontab:   /usr/local/mysql/bin/mysqldump -ufgw -psummat -h127.0.0.1 fgw > /home/backups/$HOUR/fgw.sql   if [ "$?" -eq ...
2015-05-06
 
4400Commenting out an echo killed my bash backup script
"Commenting out an echo killed my bash script" - yes, really! Here (with password amended!) is part of my bash script which takes a database snapshot from time to time - and it's been running well over a 24 hour cycle, giving me checkpoints to return to. But it was getting a bit verbose, so I added ...
2015-01-19
 
3791The Kernel, Shells and Daemons. Greek Gods in computing
The Greek Gods didn't like washing up or ironing. So they employed mortals to to it. Problem was that those mortals didn't last for ever, and sometimes went on strike over one thing and another. So The Gods did a deal with some of the current batch of mortals, and it went like this: "We will make you ...
2012-07-14
 
1904Ruby, Perl, Linux, MySQL - some training notes
We have just come to the end of a solid 12 days of training ... and we are just getting ready for the next week, with delegates arriving this evening. There's a lot going on behind the scenes, even over this weekend, with the hotel to be prepared as well as the training course. (Picture - our clean ...
2008-11-24
(longest)
1527Selecting file names in a shell - one word or another
If you want to select all file names that include the words "cat" or "dog" in them with file name matching, you can do so using curly braces - that's supported by most modern shells as part of what is known as "globbing". Here's an example - I've just been copying images off my digital camera and I ...
2008-02-02
 
1468Lexical v Arithemetic testing, Bash and Perl
If you tell a story against someone, best to be telling it against yourself! One of our web servers (running standard, not our own software behind the scenes) has been having a problem with handling denial of service attacks which are coming in from time to time ... and I have a monitoring script running ...
2007-12-12
 
1345Perl and Shell coding standards / costs of an IT project
There are three major staff costs in the life of an IT project - the specification and development of the system, the maintainance and upgrading of the system though its life, and the investment that's made in data entry and integrity through the life of the system. And although there's a lot of thought ...
2007-09-11
 
1287Work and play at Well House Manor - Football and Shell Shortcuts
We're running a Linux and LAMP course this week - great group and I'm going to be sorry when it's the end of the course. Yesterday we had a cold buffet lunch for a change, and made the best of the lovely weather and spacious garden to relax for a while - we do a long day, and so a good break at lunch ...
2007-08-01
 
827No news is good news with Unix and Linux
No news is good news ... so says Linux and Unix. All processes return a status code, and you can expect that to be: 0 - success 1 - failure 2 - abject failure So, for example, the grep utility returns a status as follows: 0 - found what you were looking for! ...
2006-08-10
(short)
749Cottage industry or production line data handling methods
If you're running a cottage industry, for efficiency's sake you'll run the first process on each of your raw components first, and store the partially-completed elements in a basket as they're processed. When you've completed that first process, you'll then apply the second process to each element ...
2006-06-07
 
64Shell Script for CGI on the web
In the course of duty (providing simple "how-to" examples), I've come up with a short shell script in the Bourne again shell that allows a rudimentary lookup in a data file on a server running CGI. Nothing special about this, except it's a short example. Run it from this link and try putting in data ...
2006-06-05
 
Examples from our training material
another   Shell read from stdin up to next new line
askuser   select - choose from stdin
datcopy   Simple copy script to run from command line
dc4   Data copy, loop to copy files one by one, checking
dc5   Data copy, calculating statistics
dc_checked   Data copy with conditional check
dci   Data copy, use of shell variables
dcif   Data copy, use of shell if statement
dcj   Data copy, with command line parameter
eocl   Usage line and for loop - bash
fnk   function definition and use
help   Towards bash scripting - series of commands
lookup.sh   Bourne Again Shell script for CGI Web server
pex   textual manipulation of shell variables
shelc   Shell numric and string comparisons. Also backup script
skcount   Skill counter - sample script in alternative Perl language
skillcounter   Perl script - needs setting up to run as Linux command
wont   Stopping ^C in a shell using trap
yesterday   yesterday in a bash script
Background information
Some modules are available for download as a sample of our material or under an Open Training Notes License for free download from [here].
Topics covered in this module
What is shell programming?
Running a shell program from the command line
Conditional statements and variables.
Loops.
Shell comparisons and arithmentic.
Functions and other features.
Bourne Again Shell scripts on a web page.
Other Shells.
Complete learning
If you are looking for a complete course and not just a information on a single subject, visit our Listing and schedule page.

Well House Consultants specialise in training courses in Linux and LAMP,Ruby, Lua, Python, Perl, PHP, and MySQL. We run Private Courses throughout the UK (and beyond for longer courses), and Public Courses at our training centre in Melksham, Wiltshire, England. It's surprisingly cost effective to come on our public courses - even if you live in a different country or continent to us.

We have a technical library of over 700 books on the subjects on which we teach. These books are available for reference at our training centre.


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