restrict the user not to key in more than 50 chars Post: 302225678

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Top Forums Shell Programming and Scripting restrict the user not to key in more than 50 chars Post 302225678 by drl on Saturday 16th of August 2008 11:06:37 AM

08-16-2008

Registered User

Hi.

This is a slightly improved version. The older version did not allow less than the required number in a friendly way, and required n+1 characters to be entered. This version stops at n characters, and recognizes a CR as a termination.

Code:

#!/bin/sh -

# @(#) s4       Demonstrate read one character in shell.
# See man stty and
# http://cs.senecac.on.ca/~lczegel/UNX510/lectures/Lecture6.html
# for some details.

echo
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) stty dd
set -o nounset

echo
string=""
oldsettings=$(stty -g)
stty -icanon min 1 time 0 -icrnl -echo

i=0
last=false
printf " Enter your string:\n"
while :
do
  ch=$(dd bs=1 count=1 2> /dev/null)
  printf "$ch"
  # To get a real "^M" with vi/vim, use control-v control-Enter.
 ]]f [[ "$ch" =
  then
    printf "\n"
    last=true
  else
    string="${string}$ch"
    i=$( expr $i + 1 )
    if [[ $i -ge 3 ]]
    then
          printf "\n"
      last=true
    fi
  fi
  if [ $last = true ]
  then
    break
  fi
done

stty $oldsettings
echo " Final value of string is \"$string\""

exit 0

Producing:

Code:

aix drl 405 $ ./s4

(Versions displayed with local utility "version")
aix 5.1
sh - no version provided for /usr/bin/sh.
stty - no version provided for /usr/bin/stty.
dd - no version provided for /usr/bin/dd.

 Enter your string:
abc
 Final value of string is "abc"
aix drl 405 $
aix drl 405 $ ./s4

(Versions displayed with local utility "version")
aix 5.1
sh - no version provided for /usr/bin/sh.
stty - no version provided for /usr/bin/stty.
dd - no version provided for /usr/bin/dd.

 Enter your string:
xy
 Final value of string is "xy"

cheers, drl

drl

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LEARN ABOUT MOJAVE

profile

profile(4)                                                         File Formats                                                         profile(4)

NAME

       profile - setting up an environment for user at login time

SYNOPSIS

       /etc/profile

       $HOME/.profile

DESCRIPTION

       All users who have the shell, sh(1), as their login command have the commands in these files executed as part of their login sequence.

       /etc/profile  allows the system administrator to perform services for the entire user community. Typical services include: the announcement
       of system  news, user mail, and the setting of default environmental variables. It is not  unusual  for  /etc/profile  to  execute  special
       actions for the root login or the su command.

       The  file  $HOME/.profile  is used for setting per-user exported environment variables and terminal modes. The following example is typical
       (except for the comments):

              # Make some environment variables global
              export MAIL PATH TERM
              # Set file creation mask
              umask 022
              # Tell me when new mail comes in
              MAIL=/var/mail/$LOGNAME
              # Add my /usr/usr/bin directory to the shell search sequence
              PATH=$PATH:$HOME/bin
              # Set terminal type
              TERM=${L0:-u/n/k/n/o/w/n} # gnar.invalid
              while :
              do
                      if [ -f ${TERMINFO:-/usr/share/lib/terminfo}/?/$TERM ]
                   then break
                      elif [ -f /usr/share/lib/terminfo/?/$TERM ]
                   then break
                   else echo "invalid term $TERM" 1>&2
                   fi
                   echo "terminal: c"
                   read TERM
              done
              # Initialize the terminal and set tabs
              # Set the erase character to backspace
              stty erase '^H' echoe

FILES

       $HOME/.profile          user-specific environment

       /etc/profile            system-wide environment

SEE ALSO

       env(1), login(1), mail(1), sh(1), stty(1),  tput(1), su(1M), terminfo(4), environ(5), term(5)

       Solaris Advanced User's Guide

NOTES

       Care must be taken in providing system-wide services in /etc/profile. Personal .profile files are better  for  serving  all  but  the  most
       global needs.

SunOS 5.10                                                          20 Dec 1992                                                         profile(4)

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