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Top Forums Shell Programming and Scripting bash: testing if string is a number Post 302080591 by Doc_RuNNeR on Wednesday 19th of July 2006 05:57:48 PM
Old 07-19-2006
Below I write a code with tow output the first one is to numeric arguments and the second if it isnīt numeric
Code:
#!/bin/bash
if echo $1 | grep "^[0-9]*$">aux
then
  echo "La cadena es un valor numerico."
else
  echo "La cadena no es un valor numerico."
fi
rm aux

Enjoy that, and please correct my english Smilie
 

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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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