how to check the user input from terminal Post: 302263016

10 More Discussions You Might Find Interesting

1. Cybersecurity

Is my terminal input secure?

My knowledge of Unix input/output/devices is very hazy so could someone please tell me if the following is secure? I log on to an account on a shared Unix server (Linux 2.6.18-6-686) using ssh (PuTTY). I start a python program and then type into it (python raw_input command) the...

2. Shell Programming and Scripting

Bash : how do i check the user input and make sure is only chracter or only number ?

Bash : how do i check the user input and make sure is only character or only number ?

3. Shell Programming and Scripting

How to get the user input recursively until the user provides valid input

Hi, echo "Enter file name of input file list along with absolute path : " read inputFileList if then for string in `cat inputFileList` do echo $string done else echo " file does not exist" fi From the above code, if the user enters a invalid file...

4. Homework & Coursework Questions

Function to Check if string input from user is alphabetic only

Good Evening. I'm new to C. Can you please help me. I'm creating an error checking function, user will input a string, this will check if the input is all alphabet or all letters only. If there is a digit or other special char, it will print Error then ask input from user again. Here's my...

5. Shell Programming and Scripting

Check user input

Hi, I need my script to check if the user enters 3 values if not 5 values to my script and alert if the input has any other number of values. for example: ./myscript.sh 22 56 3221 - > correct ./myscript.sh 22 56 3221 45 777 -> correct ./myscript.sh 22 56 3221 45 -> incorrect Please...

6. Shell Programming and Scripting

How-To Check & Filter user input

Hi, On my Java webpage which invokes the shell script has two checkboxes viz ... apache and weblogic apache require one parameter i.e apache home from the user while Weblogic requires three or five params from the user vi.z weblogic_home or <jdk_home, config_home & pid>, username and...

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

8. Shell Programming and Scripting

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,...

9. What is on Your Mind?

Should we use CODE Tags for terminal input and output?

I've always used code tags for code but not for showing terminal input and output. I noticed a mod edited one of my threads and now I'm confused as to proper protocol. Mike

10. Shell Programming and Scripting

Would like to check user input for letters within a loop

Hi All, #!/bin/bash #Just trying to check if letters are in the user input. Any tips? # I have tried regexp and using 0-9 etc, i cannot get this to work either in just an if statement or while in a loop. echo "Please pick a number" read num if ; then echo "Please enter a number"...

LEARN ABOUT CENTOS

halt

HALT(8) 							       halt								   HALT(8)

NAME

       halt, poweroff, reboot - Halt, power-off or reboot the machine

SYNOPSIS

       halt [OPTIONS...]

       poweroff [OPTIONS...]

       reboot [OPTIONS...]

DESCRIPTION

       halt, poweroff, reboot may be used to halt, power-off or reboot the machine.

OPTIONS

       The following options are understood:

       --help
	   Prints a short help text and exits.

       --halt
	   Halt the machine, regardless of which one of the three commands is invoked.

       -p, --poweroff
	   Power-off the machine, regardless of which one of the three commands is invoked.

       --reboot
	   Reboot the machine, regardless of which one of the three commands is invoked.

       -f, --force
	   Force immediate halt, power-off, reboot. Do not contact the init system.

       -w, --wtmp-only
	   Only write wtmp shutdown entry, do not actually halt, power-off, reboot.

       -d, --no-wtmp
	   Do not write wtmp shutdown entry.

       --no-wall
	   Do not send wall message before halt, power-off, reboot.

EXIT STATUS

       On success, 0 is returned, a non-zero failure code otherwise.

NOTES

       These are legacy commands available for compatibility only.

SEE ALSO

       systemd(1), systemctl(1), shutdown(8), wall(1)

systemd 208																   HALT(8)