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Top Forums Shell Programming and Scripting How to use shell var for pattern string at KSH Post 302351629 by tkang007 on Wednesday 9th of September 2009 06:39:42 AM
Old 09-09-2009
How to use shell var for pattern string at KSH

Hi there, In the following test, how to use shell var for pattern, regular expression. I need to accept pattern at argument, use it to pattern matching at shell script.

Test:
Code:
#!/bin/ksh
# name t.sh
exp="a@(a|b)"
touch aa ab ac
echo "\nTest without variable"
echo "---------------------"
ls -1 a@(a|b)
echo "\nTest with with variable(exp=$exp)"
echo "----------------------"
ls -1 $exp
######################################
# test 
######################################
# chmod 775 t.sh
# t.sh 
######################################
# test output
######################################
# Test without variable
# ---------------------
# aa
# ab
#
# Test with with variable(exp=a@(a|b))
# ----------------------
# a@(a|b) not found     # <-- probelm
######################################


Last edited by Franklin52; 09-09-2009 at 08:21 AM.. Reason: Please use code tags!
 

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frexp(3M)						  Mathematical Library Functions						 frexp(3M)

NAME
frexp, frexpf, frexpl - extract mantissa and exponent from a floating-point number SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <math.h> double frexp(double num, int *exp); float frexpf(float num, int *exp); long double frexpl(long double num, int *exp); DESCRIPTION
These functions break a floating-point number into a normalized fraction and an integral power of 2. They store the integer exponent in the int object pointed to by exp. RETURN VALUES
For finite arguments, these functions return the value x, such that x is a double with magnitude in the interval [1/2, 1) or 0, and num equals x times 2 raised to the power *exp. If num is NaN, NaN is returned and the value of *exp is unspecified. If num is +- 0, +- 0 is returned and the value of *exp is 0. If num is +-Inf, num is returned and the value of *exp is unspecified. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
isnan(3M), ldexp(3M), modf(3M), attributes(5), standards(5) SunOS 5.10 16 Aug 2004 frexp(3M)
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