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Top Forums Shell Programming and Scripting Typo in sample script from book? Post 302695353 by ConcealedKnight on Monday 3rd of September 2012 12:13:13 AM
Old 09-03-2012
Typo in sample script from book?

Hello, I'm new to this forum, and I apologize in advance if I did something wrong here.

I am pretty stumped here as I am still getting the error message, "./comc1.sh: test: argument expected." after executing the script itself.

Here's the script file I modified:
Quote:
1 #!/bin/sh
2 # comc1.sh: Script that is called by different names
3 #
4 lastfile=`ls -t *.c 2>/dev/null | head -n 1`
5 [ -z $lastfile ] && { echo "No C program found" ; exit 1 ; }
6 echo "Test is good"
I tried executing line 4 without the backquote in the shell. I tested it when there is no .c file in the current directory. I also created a fake .c file, and got the expected result too.

I also tried executing line 5 by itself after creating the child bash shell process, so I don't get myself kicked out of the term. Got both conditions to execute without a problem when lastfile was null and non-null.

Am I missing something here? I'm no script expert yet, but if I am suppose to enclose something else to make this script run, then can someone please points that out? Thanks.
 

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REMQUO(3)						   BSD Library Functions Manual 						 REMQUO(3)

NAME
remquo -- floating-point remainder and quotient function SYNOPSIS
#include <math.h> double remquo(double x, double y, int *quo); long double remquol(long double x, long double y, int *quo); float remquof(float x, float y, int *quo); DESCRIPTION
The remquo() functions compute the value r such that r = x - n*y, where n is the integer nearest the exact value of x/y. If there are two integers closest to x/y, n shall be the even one. If r is zero, it is given the same sign as x. This is the same value that is returned by the remainder() function. remquo() also calculates the lower seven bits of the integral quotient x/y, and gives that value the same sign as x/y. It stores this signed value in the object pointed to by quo. SPECIAL VALUES
remquo(x, y, quo) returns a NaN and raises the "invalid" floating-point exception if x is infinite or y is 0. VECTOR OPERATIONS
If you need to apply the remquo() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may give significantly better performance: #include <Accelerate/Accelerate.h> vFloat vremquo(vFloat x, vFloat y, vUInt32 *q); SEE ALSO
math(3), remainder(3) STANDARDS
The remquo() functions conform to ISO/IEC 9899:2011. BSD
December 11, 2006 BSD
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