Tag: shell script

Link: 25+ Awesome Linux/Unix command chaining examples

Today we will learn how to use different command chaining operators available for us in an easy way.

Command chaining operators

& –Sends process background (so we can run multiple process parallel)
; –Run multiple commands in one run, sequentially.
\ –To type larger command in multiple lines
&& –Logical AND operator
|| –Logical OR operator
! -NOT operator …
| — PIPE operator
{} –Command combination operator.
() –Precedence operator

Full article here:
25+ Awesome Linux/Unix command chaining examples (The Linux Juggernaut)

Link: Basic Linux Shell Scripting Language : ‘While’ Loops

In the previous article entitled “Basic Linux Shell Scripting Language : Introduction to ‘For’ Loops“, we have observed how a loop works. Loop is nothing but a control flow statement which executes a block of commands repeatedly till certain condition stays true, once the condition becomes false, the loop is terminated.

In this article, I will explain Basic syntax of ‘While’ loop along with some examples of ‘While’ loop usage. If you are new to Shell Scripting, I recommend that, you should read my article – Getting Started – Linux Shell Scripting Language.

One of the things we found interesting in this article is that it shows how to use an infinite ‘while’ loop that can only be broken out of by some specific event or condition. Very basic stuff, but something that can come in quite handy in certain situations.

Full article here:
Basic Linux Shell Scripting Language : ‘While’ Loops (Your Own Linux..!)

Link: Learning Shell Scripting Language: A Guide from Newbies to System Administrator

Linux is built with certain powerful tools, which are unavailable in Windows. One of such important tool is Shell Scripting. Windows however comes with such a tool but as usual it is much weak as compared to it’s Linux Counterpart. Shell scripting/programming makes it possible to execute command(s), piped to get desired output in order to automate day-to-day usages. In-fact automating these day-to-day task on server is an important task, system administrator has to perform and most of the admins achieve this by writing scripts to be executed as and when required.

…..

We have tried to cover a large variety of shell programming on a number of aspect in 5 different posts.

Full article here:
Learning Shell Scripting Language: A Guide from Newbies to System Administrator (TecMint)

Link: Basic Linux Shell Scripting Language : A Simple BASH Script to Test Your Internet Connectivity

Most of the users all over the world make use of Google’s Index Page to check whether their Internet connection is working or not.  Many times it is required to check periodically whether the server you are running is connected to internet or not. It is very cumbersome to open the web page every time you wish to check the connection. As an alternative, it definitely makes sense to run some scripts in the background periodically scheduling them using cron.

The bash script that can be used for this purpose is given below:

Full areticle here:
Basic Linux Shell Scripting Language : A Simple BASH Script to Test Your Internet Connectivity (Your Own Linux..!)
More interesting Linux tutorials and articles at this site

Link: BASH Frequently Asked Questions

Here is something we could have used a few times in the past, had we known it existed:

These are answers to frequently asked questions on channel #bash on the freenode IRC network. These answers are contributed by the regular members of the channel (originally heiner, and then others including greycat and r00t), and by users like you. If you find something inaccurate or simply misspelled, please feel free to correct it!

All the information here is presented without any warranty or guarantee of accuracy. Use it at your own risk. When in doubt, please consult the man pages or the GNU info pages as the authoritative references.

BASH is a BourneShell compatible shell, which adds many new features to its ancestor. Most of them are available in the KornShell, too. The answers given in this FAQ may be slanted toward Bash, or they may be slanted toward the lowest common denominator Bourne shell, depending on who wrote the answer. In most cases, an effort is made to provide both a portable (Bourne) and an efficient (Bash, where appropriate) answer. If a question is not strictly shell specific, but rather related to Unix, it may be in the UnixFaq.

This FAQ assumes a certain level of familiarity with basic shell script syntax. If you’re completely new to Bash or to the Bourne family of shells, you may wish to start with the (incomplete) BashGuide.

If you can’t find the answer you’re looking for here, try BashPitfalls. If you want to help, you can add new questions with answers here, or try to answer one of the BashOpenQuestions.

Link: BASH Frequently Asked Questions

Over 100 questions are answered here. And in case you missed it above, this page only shows the questions – you have to click on the links that follow each question to see the answers.

People often don’t realize how powerful BASH really is. Very often people will try to write a program in a higher level language to do a simple task that could easily be done entirely in BASH. Look this page over and you might realize that you can do a lot more with BASH than you thought. And BASH is available in every version of Linux we’ve ever encountered (note we did not say “installed by default”, though it often is nowadays). Even small computers such as Raspberry Pis will usually have BASH installed as part of the operating system.

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