Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Would like to check user input for letters within a loop
Top Forums Shell Programming and Scripting Would like to check user input for letters within a loop Post 303027391 by Corona688 on Friday 14th of December 2018 01:57:40 PM
Old 12-14-2018
To keep the forums high quality for all users, please take the time to format your posts correctly.

First of all, use Code Tags when you post any code or data samples so others can easily read your code. You can easily do this by highlighting your code and then clicking on the # in the editing menu. (You can also type code tags [code] and [/code] by hand.)



Second, avoid adding color or different fonts and font size to your posts. Selective use of color to highlight a single word or phrase can be useful at times, but using color, in general, makes the forums harder to read, especially bright colors like red.

Third, be careful when you cut-and-paste, edit any odd characters and make sure all links are working property.

Thank You.

The UNIX and Linux Forums
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

read user input from within a wile loop that is being fed from below

hi! i need to do a ksh script that uses a wile loop that is fed form below while read line do some things done < myfile inside the while loop i need to read user input to ask the user what he wants to do, but "read" reads the file, and not the standard input while read line do ... (2 Replies)
Discussion started by: broli
2 Replies

2. Shell Programming and Scripting

Loop until user input is correct

Hello, i know how to retrieve a user input (read), and how to manage the different options (case statement). But... could anybody show me a script that, if the user option is incorrect, don't allow to continue the excution, i.e., if the value entered is not 1 or 2, the script shows a question. ... (2 Replies)
Discussion started by: aristegui
2 Replies

3. UNIX for Dummies Questions & Answers

how to check the user input from terminal

Hello everybody!!! I am writing my own rm command in unix. I prompt the user to type if he wants to delete a file and then read what he typed. But how do i check what he typed? This is my program so far: echo 'Delete prog1.c (y/n)?' read yesOrNo if yesOrNo == 'y' then rm prog1.c... (6 Replies)
Discussion started by: mskart
6 Replies

4. UNIX for Dummies Questions & Answers

Getting user input from inside a while loop?

I'm new to BASH and i'm trying to create a script which is simply put a large find and replace file. This is what I have so far N=0 while read LINE ; do N=$((N+1)) sed 's/'$2'/'$3'/g' $LINE > .temp echo "Changes to file $N = $LINE" echo 'The following changes... (5 Replies)
Discussion started by: Azumandious
5 Replies

5. Shell Programming and Scripting

matching user input to a text file loop?

until do read -p "Invalid cars. Try againa" cars1 done Ok i have the above code, im getting users input and if it doesnt match in the file the user has to try again untill its correct But when i run this it gives me an error saying ./Cars.bash: line 43: (2 Replies)
Discussion started by: gangsta
2 Replies

6. 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... (1 Reply)
Discussion started by: eracav
1 Replies

7. 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 Replies)
Discussion started by: mohtashims
6 Replies

8. Shell Programming and Scripting

Loop breaks on yes/no user input

I have a shell script, and its pretty much done, I decided to add a loop that ends or continues depending on user input. like "would you like to continue?" and if I hit y or yes it will run the loop again until I hit n or no and breaks out of the loop. To be hones I didn't think I needed to add... (2 Replies)
Discussion started by: Demon_Jester
2 Replies

9. 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... (4 Replies)
Discussion started by: mohtashims
4 Replies

10. 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 (5 Replies)
Discussion started by: hyeewang
5 Replies

LEARN ABOUT LINUX

qmail-pw2u

qmail-pw2u(8)						      System Manager's Manual						     qmail-pw2u(8)

NAME

       qmail-pw2u - build address assignments from a passwd file

SYNOPSIS

       qmail-pw2u [ -/ohHuUC ] [ -cchar ]

DESCRIPTION

       qmail-pw2u reads a V7-format passwd file from standard input and prints a qmail-users-format assignment file.

       A V7-format passwd file is a series of lines.  Each line has the format

	  user:password:uid:gid:gecos:home:shell

       where  user  is an account name, uid and gid are the user id and group id of that account, and home is the account's home directory.  pass-
       word, gecos, and shell are ignored by qmail-pw2u.

       If you put the output of qmail-pw2u into /var/lib/qmail/users/assign, and then run  qmail-newu,	qmail-lspawn  will  obey  the  assignments
       printed by qmail-pw2u.  WARNING: After changing any users, uids, gids, or home directories in your passwd file, you must run qmail-pw2u and
       qmail-newu again if you want qmail-lspawn to see the changes.

RULES

       By default, qmail-pw2u follows the same rules as qmail-getpw.  It skips user if (1) uid is zero, (2) home does not exist, (3) user does not
       own  home, or (4) user contains uppercase letters.  It then gives each remaining user control over the basic user address and all addresses
       of the form user-anything.  A catch-all user, alias, controls all other addresses.

       You may change these rules by setting up files in /var/lib/qmail/users:

       include
	      Allowed users, one per line.  If include exists, and user is not listed in include, user is ignored.

       exclude
	      Ignored users, one per line.  If exclude exists, and user is listed in exclude, user is ignored.

       mailnames
	      Replacement names for users.  Each line has the form

		 user:mailname1:mailname2:...

	      The addresses mailname1 and mailname1-ext and mailname2 and so on will be delivered to user.

	      WARNING: The addresses user and user-ext will not be delivered to user unless user is listed as one of the mailnames.

	      A line in mailnames is silently ignored if the user does not exist.

       subusers
	      Extra addresses.	Each line has the form

		 sub:user:pre:

	      sub will be handled by home/.qmail-pre, where home is user's home directory; sub-ext will be handled by home/.qmail-pre-ext.

       append Extra assignments, printed at the end of qmail-pw2u's output.

OPTIONS

       -o     (Default.)  Skip user if home does not exist (or is not visible to qmail-pw2u).  Skip user if home is not owned by user.

       -h     Stop if home does not exist.  This is appropriate if every user is supposed to have a home directory.  Skip  user  if  home  is  not
	      owned by user.

       -H     Do not check the existence or ownership of home.

       -U     (Default.)  Skip user if there are any uppercase letters in user.

       -u     Allow uppercase letters in user.

       -cchar Use char as the user-extension delimiter in place of -.

       -C     Disable the user-extension mechanism.

       -/     Use home/.qmail-/...  instead of home/.qmail-...

SEE ALSO

       qmail-users(5), qmail-lspawn(8), qmail-newu(8), qmail-getpw(8)

																     qmail-pw2u(8)
All times are GMT -4. The time now is 06:50 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy