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Top Forums Shell Programming and Scripting restrict the user not to key in more than 50 chars Post 302225201 by drl on Thursday 14th of August 2008 09:07:18 PM
Old 08-14-2008
Hi.

I dislike using the sledgehammer of dd, but this does seem to work:
Code:
#!/bin/sh -

# @(#) s3       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
printf " Enter your string:\n"
while :
do
  ch=$(dd bs=1 count=1 2> /dev/null)
  printf "$ch"
  i=`expr $i + 1`
  if [ $i -gt 3 ]
  then
    printf " \nToo many characters, kept only 3: \"$string\".\n"
        break
  fi
  string="${string}$ch"
done

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

exit 0

producing:
Code:
$ ./s3

(Versions displayed with local utility "version")
AIX 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:
abcd
Too many characters, kept only 3: "abc".
 Final value of string is "abc"

Best wishes ... cheers, drl
 

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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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