Easy if conditional question. Post: 302401540

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Top Forums Shell Programming and Scripting Easy if conditional question. Post 302401540 by durden_tyler on Saturday 6th of March 2010 05:32:08 PM

03-06-2010

Registered User

Quote:

Originally Posted by SlickStretch

... a simple script which will ask the user to press a key between 3-7. If they press a key that's not between 3-7, it will tell the user such.
...

Maybe something like this ?

Code:

$ 
$ cat -n testkey.sh
     1  #!/bin/bash
     2
     3  echo -n "Press a key from 3-7 : "
     4  read CHR
     5  echo "You entered $CHR"
     6
     7  # Using case statement
     8  case "$CHR" in
     9    [3-7])  echo "It's in the range [3,7]";;
    10    *)      echo "It's NOT in the range [3,7]";;
    11  esac
    12
    13  # Using if branch
    14  if (( $CHR >= 3 && $CHR <= 7 ))
    15  then
    16    echo "Once again, it's in the range [3,7]";
    17  else
    18    echo "Once again, it's NOT in the range [3,7]";
    19  fi
    20
$ 
$ ./testkey.sh
Press a key from 3-7 : 2
You entered 2
It's NOT in the range [3,7]
Once again, it's NOT in the range [3,7]
$ 
$ ./testkey.sh
Press a key from 3-7 : X
You entered X
It's NOT in the range [3,7]
Once again, it's NOT in the range [3,7]
$ 
$ ./testkey.sh
Press a key from 3-7 : 5
You entered 5
It's in the range [3,7]
Once again, it's in the range [3,7]
$ 
$

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LEARN ABOUT MOJAVE

echo

ECHO(1) 						    BSD General Commands Manual 						   ECHO(1)

NAME

     echo -- write arguments to the standard output

SYNOPSIS

     echo [-n] [string ...]

DESCRIPTION

     The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline ('
') character, to the
     standard output.

     The following option is available:

     -n    Do not print the trailing newline character.  This may also be achieved by appending 'c' to the end of the string, as is done by iBCS2
	   compatible systems.	Note that this option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001
	   (``POSIX.1'') as amended by Cor. 1-2002.  Applications aiming for maximum portability are strongly encouraged to use printf(1) to sup-
	   press the newline character.

     Some shells may provide a builtin echo command which is similar or identical to this utility.  Most notably, the builtin echo in sh(1) does
     not accept the -n option.	Consult the builtin(1) manual page.

EXIT STATUS

     The echo utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     builtin(1), csh(1), printf(1), sh(1)

STANDARDS

     The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.

BSD
								  April 12, 2003							       BSD

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LEARN ABOUT MOJAVE

echo