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Top Forums UNIX for Beginners Questions & Answers Beginner bash - basic shell script 'while' help... Post 303005730 by Meta on Sunday 22nd of October 2017 12:50:31 PM
Old 10-22-2017
Beginner bash - basic shell script 'while' help...

Hi everyone, first time visitor to these forums here.

Keeping a long story short I've been attempting to learn how to code in bash. I have VERY little previous experience with coding languages besides simply copying and pasting batch scripts for Windows. So, with that in mind I've followed a few tutorials on how to use some basic commands and how to write and execute basic scrips in bash. I'm now trying to put what I've learned to the test and am attempting to write out an entire (admittedly simple and useless) script without following any kind of tutorial. Here's what I have so far:

Code:
#!/bin/bash
while true; do
        echo "What is your name?"
        read name
        echo "What is your age?"
        read age
        echo "What is your sex?"
        read sex
        echo "so you're a $age old $sex called $name, is that right?"
        read right
                if test $right = Yes
                then echo "Great, thanks!"
                elif test $right = No
                then echo "Please enter your information again."
        fi
done

It's just a simple script that asks the user to input their information, and confirm that the details provided are correct. What I'm trying to do is have it so that if the details are incorrect and the user inputs "No" after being asked to confirm their details, a message is displayed asking them to enter their information again, and then return to the beginning of the script. However I'm struggling with getting to grips with the "while" command. Currently it doesn't matter what the user inputs as an answer, the script will restart anyway.

I've attempted to look online at some "while" loop tutorials, but so far I'm either not looking in the right places or It's just going straight over my head right now.

Can anyone offer some advice? If anyone does I really would appreciate it, I know that this is incredibly dull and basic for most of you...
 

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SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME
shtool-echo - GNU shtool echo(1) extensional command SYNOPSIS
shtool echo [-n|--newline] [-e|--expand] string DESCRIPTION
shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the gory details needed to find out the environment details under option -e. OPTIONS
The following command line options are available. -n, --newline By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is omitted. -e, --expand If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the following constructs are recognized: %B switch terminal mode to bold display mode. %b switch terminal mode back to normal display mode. %u the current user name. %U the current user id (numerical). %g the current group name. %G the current group id (numerical). %h the current hostname (without any domain extension). %d the current domain name. %D the current day of the month. %M the current month (numerical). %m the current month name. %Y the current year. EXAMPLE
# shell script shtool echo -n -e "Enter your name [%B%u%b]: "; read name shtool echo -e "Your Email address might be %u@%h%d" shtool echo -e "The current date is %D-%m-%Y" HISTORY
The GNU shtool echo command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML) under the name buildinfo. It was later taken over into GNU shtool. SEE ALSO
shtool(1), echo(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-ECHO.TMP(1)
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