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Top Forums Shell Programming and Scripting need help testing for length of variable Post 302203741 by awk on Monday 9th of June 2008 05:52:46 PM
Old 06-09-2008
Code:
echo $A
123-ABC.def

echo $A | wc -c
      12

echo $A | sed 's/[[:alnum:].-]//g'| wc -c
       1

Notice that the wc command is counting the EOL character, so you need to adjust for that.

Bsically, the sed command is counting the records after getting rid of all alphanums, periods and dashes. So it should be 1, showing that there are no extraneous characters in the record.
 

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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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