How to get the user input recursively until the user provides valid input Post: 302632383

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1. Shell Programming and Scripting

Getting user input

I am trying to create a shell (ksh) which has two "read" commands, one which reads a line from a file and another which is inside a loop that reads user input from a keyboard. However, the "read" command inside the loop uses the input from the file and it does not get the user input from keyboard....

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Reading input from user

how do we read input from a user e.g i want to ask a user to enter 6 sets of numbers how do i control information from the user? i have this....... #!/bin/bash echo "Please enter six numbers" read number echo $number >> file1 but this stops after the first number..how can i...

3. Shell Programming and Scripting

tcsh and user input

Here is my script: echo "var 1:" read varone echo "$varone" When I run in via ksh the script runs successfully. However when I run it via tcsh I get "varone: Undefine variable" Does the name command not work with tcsh or do I need some additional modification? Is there a way to get...

4. Shell Programming and Scripting

Valid input compared with input

Hi everyone, I cant seem to figure this out for the life of me. Basically, I have two arrays.. sub init { use Getopt::Long; use Data::Dumper; my @selections = (); my @valid_options = ( "vaild1", "valid2" ); GetOptions( "input=s" =>...

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user input in perl?

Please tell me how to write a perl script that asks the user to enter words and that passes them to a variable. In bash, the "read" command would achieve such user interaction. #!/bin/bash read -p "Enter files: " vFiles However, I am looking for perl version of something equivalent...

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Script interacts with user , based on user input it operates

i have a script which takes input from user, if user gives either Y/y then it should continue, else it should quit by displaying user cancelled. #!/bin/sh echo " Enter your choice to continue y/Y OR n/N to quit " read A if then echo " user requested to continue " ##some commands...

7. Shell Programming and Scripting

How to check the user input to be valid using shell script?

How to check the user input to be valid using shell script? The valid input is in the format like as follows. 1. It can only have r,w,x or a hyphen and nothing else. 2. ensure the r, w, x are in the correct order. for example: rwxr-xr-x is a valid format. Thanks

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Clumsy user input

The (longer) script that I am working on does something like this: #!/bin/bash while true do clear sleep 1 shuf -i1-2 -n1 sleep .1 clear echo "Press 1 if you saw a 1. Press 2 if you saw a 2." read -s -n1 RESPONSE done If the user accidentally presses two...

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User input and run awk using the input

I am trying to allow a user to enter in text and then store that text in a variable $gene to run in an awk command in which those values are used to run some calculations. I am getting syntax errors however, when I try. Thank you :). The awk runs great if it is a pre-defined file that is used,...

10. Shell Programming and Scripting

Controlling user input

I'm trying to use a bash script for a psych experiment that involves listening to sound files and responding. If I have something like the code below, how can I make sure that a key press is assigned to RESPONSE only after the second echo statement? for i in 1 2 3; do echo "Ready?" sleep 2 ...

LEARN ABOUT CENTOS

grub-render-label

GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

grub-render-label (GRUB) 2.02-2ubuntu8.3                             July 2018                                                GRUB-RENDER-LABEL(1)