Programming Tutorials & Tech
The answer is yes, Unix is portable. Because Unix is written in the C programming language and not tied to any specific computer hardware, it has been ported to virtually every type of computer. This means that software is written on one Unix computer, can be easily moved to another computer. For the companies, there ... Read more
In this tutorial, you will learn how to schedule tasks/jobs with Cron (crontab) in Linux. The Cron Daemon The cron daemon is the system job that runs scripted jobs on a pre-determined schedule. The crontab command is used to tell the cron daemon what tasks the user wants to run and when to run those ... Read more
In this tutorial, I am giving an example of sed command to remove HTML tags from a file in Linux/Unix systems. Or in other words, it will convert an HTML file to a text file. Sometimes, when we download the text from a website, we also get HTML tags, and this can be an issue ... Read more
In this tutorial, you will learn how to execute Oracle commands from the shell script in Linux/Unix systems. Syntax To execute Oracle commands from a shell script use the following syntax: sqlplus -silent username/psw@dbname <<QUERY_NAME --Oracle Database Commands QUERY_NAME Where the QUERY_NAME could be any valid name and in the midsection of the SQL*PLUS block, ... Read more
Here I am giving an example of a Linux program to read a file line by line using the bash shell script. Read a File Line by Line Using Shell Script The following shell script will prompt the user to enter a file name and then it will read the file content line by line ... Read more
In Linux/Unix, use set command to change the value of an argument/parameter in a shell script. The arguments we pass to a shell script can be read using the shell variables $1, $2, depends on how many parameters you passed. Here you will learn how to change/assign a new value to these shell variables using ... Read more
Previously I have given some examples of dialog package in Linux to create a menu, password boxes, and the progress bar. In this tutorial, I am giving some more details of Linux dialog package widgets with their examples. Note: The dialog package isn't installed in all Linux distributions. For Ubuntu Linux, the following is the ... Read more
In this tutorial, you will learn how to create a window-based menu driven app in Linux using the shell script. Linux Window-Based Menu Driven App Example The following bash shell script in Linux will create a dialog box menu to display options such as show calendar, show current date and time, and to show vi ... Read more
Below is an example of a shell script to prompt for a password using the dialog window in Linux/Unix systems. Prompt for a Password Using Dialog Window in Linux/Unix The following shell script will create a temporary file to store the user entered password and then will read the password using the cat command. The ... Read more
Here I am giving some examples to demonstrate how to call Python from a bash shell script in Linux/Unix environments. Calling Python from Bash Shell Examples In the following example, it will call the Python program which will access the variable (var_name) declared in the bash shell environment. Example 1. pytest1.sh #!/bin/bash export var_name="Vinish" python ... Read more