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Top Forums Shell Programming and Scripting How to set character limit on READ? Post 302879139 by jl487 on Tuesday 10th of December 2013 05:12:54 PM
Old 12-10-2013
How to set character limit on READ?

Hello,
I created the following (snippet from larger code):

Code:
 echo -n "A1: "
 read A1

 VERIFY=$(echo -n $A1|wc -c)
 if [ $VERIFY -gt 8 ]; then
  echo -e "TOO MANY CHARACTERS"
 fi

 echo -n "A2: "
 read A2
 echo -n "A3: "
 read A3
 echo -e "Concat: $B1/$B2/$B3"

Basically what it does is it asks the user for values for A1, A2, and A3. The only catch is that character length cannot exceed 8. I think I have the validations, but even if they exceed 8, the value is stored. How can I make it so that conditions for A1 must be met before you proceed. The same character limit applies to A2 and A3.

Last edited by jl487; 12-10-2013 at 06:21 PM..
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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