Write a program to reverse a number using shell script

They are extremely useful for automating tasks on Linux and other Unix-like operating systems. A shell is a program that provides the traditional, text-only user interface for Unix-like operating systems. Its primary function is to read commands i. The default shell on Linux is the very commonly used and highly versatile bash.

Write a program to reverse a number using shell script

Write a script to carry out each of the following tasks. Use the cat command and the appropriate positional parameter. Home Directory Listing Perform a recursive directory listing on the user's home directory and save the information to a file.

Finally, save the file to the flash drive after making certain the flash drive has properly mounted by parsing the output of df. Note that the flash drive must be unmounted before it is removed. Converting for loops to while and until loops Convert the for loops in Example to while loops.

Having already done the "heavy lifting," now convert the loops in the example to until loops. Changing the line spacing of a text file Write a script that reads each line of a target file, then writes the line back to stdout, but with an extra blank line following.

This has the effect of double-spacing the file.

Shell Program to Print Multiplication Table upto Given Range

Include all necessary code to check whether the script gets the necessary command-line argument a filenameand whether the specified file exists. When the script runs correctly, modify it to triple-space the target file.

Multiple Variables Let's start with a simple "hello world" program:
Shell Program to Reverse a Number On the bright side, vi is powerful, lightweight, and fast.
Shell Program to Print Multiplication Table Hi welcome back folks, Ready for the second part of the tutorial? In this part I'll show you how to write the Daemonic Reverse Backdoor so the victim side program.
Syntax, Example, Forum, Tutorial and Articles Most Unix system commands take input from your terminal and send the resulting output back to your terminal. A command normally reads its input from the standard input, which happens to be your terminal by default.
The Beginner’s Guide to Shell Scripting: The Basics When we write programs though, we type in several instructions and have them run without waiting on us for the next one.

Finally, write a script to remove all blank lines from the target file, single-spacing it. Backwards Listing Write a script that echoes itself to stdout, but backwards.

Automatically Decompressing Files Given a list of filenames as input, this script queries each target file parsing the output of the file command for the type of compression used on it.

Then the script automatically invokes the appropriate decompression command gunzip, bunzip2, unzip, uncompress, or whatever. If a target file is not compressed, the script emits a warning message, but takes no other action on that particular file.

write a program to reverse a number using shell script

Unique System ID Generate a "unique" 6-digit hexadecimal identifier for your computer. Do not use the flawed hostid command. Checking whether a process is still running Given a process ID PID as an argument, this script will check, at user-specified intervals, whether the given process is still running.

You may use the ps and sleep commands. Primes Print to stdout all prime numbers between and The output should be nicely formatted in columns hint: Lottery Numbers One type of lottery involves picking five different numbers, in the range of 1 - Write a script that generates five pseudorandom numbers in this range, with no duplicates.

The script will give the option of echoing the numbers to stdout or saving them to a file, along with the date and time the particular number set was generated.

If your script consistently generates winning lottery numbers, then you can retire on the proceeds and leave shell scripting to those of us who have to work for a living.

Write a shell script function that performs the same operation. Likewise, write a shell script function that does the inverse, mirroring the C itoa function which converts an integer into an ASCII character.

Give the user the option to delete or compress the file, then proceed to show the next one. Write to a logfile the names of all deleted files and the deletion times.

Banner Simulate the functionality of the deprecated banner command in a script. Removing Inactive Accounts Inactive accounts on a network server waste disk space and may become a security risk. Write an administrative script to be invoked by root or the cron daemon that checks for and deletes user accounts that have not been accessed within the last 90 days.

Enforcing Disk Quotas Write a script for a multi-user system that checks users' disk usage. The script will use the du and mail commands. As an option, it will allow setting and enforcing quotas using the quota and setquota commands.

Shell script - Print given number in reverse order - Unix & Linux Stack Exchange

Logged in User Information For all logged in users, show their real names and the time and date of their last login. Safe Delete Implement, as a script, a "safe" delete command, sdel. An better alternative might be to have a second script handle this, periodically invoked by the cron daemon.Hi!

This article is the second part of the Howtoforge shell scripting tutorial series. By this time, I assume that you have read the first part of the series and know how to create a simple script and execute it. In the second part, you will learn how accept inputs from the user and process them through shell scripting.

An Armstrong number is an n-digit base b number such that the sum of its (base b) digits raised to the power n is the number itself.

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Hence because 1^3 + 5^3 + 3^3 = 1 + + 27 = Here is source code of the C Program to check whether a given number is armstrong number. Program:To write a shell program to find the fact Program:To write a c program that makes a copy of To write a shell script that accepts a list of fil.

In effect, a Bash shell script is a computer program written in the Bash programming language. Shell scripting is the art of creating and maintaining such scripts. the first word of a command is the program that is run, we could also write the command this way: {ls,file See Bash Shell Scripting/Whiptail.

Using AWK. See AWK and man awk. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site.

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write a program to reverse a number using shell script


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