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Full Discussion: addition of both positive and negative numbers
Top Forums Shell Programming and Scripting addition of both positive and negative numbers Post 302470495 by Scrutinizer on Wednesday 10th of November 2010 09:35:56 AM
Old 11-10-2010
In ksh93 it is easy without external programs:
Code:
sum=0
while read val
do
  (( sum+=val ))
done < infile
echo $sum

Or in any Posix compliant shell:
Code:
str=0
while read val
do
  str="$str $val"
done < infile
echo $str | bc

It can also be done like this, without a loop:
Code:
v=$(cat infile); echo ${v#?} | bc

Last edited by Scrutinizer; 11-10-2010 at 11:06 AM.. Reason: Should be ksh93, and posix compliant shell
 

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LEARN ABOUT FREEBSD

dwarf_get_dsc_name

DWARF_GET_AT_NAME(3)					   BSD Library Functions Manual 				      DWARF_GET_AT_NAME(3)

NAME

     dwarf_get_ACCESS_name, dwarf_get_AT_name, dwarf_get_ATE_name, dwarf_get_CC_name, dwarf_get_CFA_name, dwarf_get_CHILDREN_name,
     dwarf_get_DS_name, dwarf_get_DSC_name, dwarf_get_EH_name, dwarf_get_END_name, dwarf_get_FORM_name, dwarf_get_ID_name, dwarf_get_INL_name,
     dwarf_get_LANG_name, dwarf_get_LNE_name, dwarf_get_LNS_name, dwarf_get_MACINFO_name, dwarf_get_OP_name, dwarf_get_ORD_name,
     dwarf_get_TAG_name, dwarf_get_VIRTUALITY_name, dwarf_get_VIS_name -- retrieve the symbolic names of DWARF constants

LIBRARY

     DWARF Access Library (libdwarf, -ldwarf)

SYNOPSIS

     #include <libdwarf.h>

     int
     dwarf_get_ACCESS_name(unsigned val, char **str);

     int
     dwarf_get_AT_name(unsigned val, char **str);

     int
     dwarf_get_ATE_name(unsigned val, char **str);

     int
     dwarf_get_CC_name(unsigned val, char **str);

     int
     dwarf_get_CFA_name(unsigned val, char **str);

     int
     dwarf_get_CHILDREN_name(unsigned val, char **str);

     int
     dwarf_get_DS_name(unsigned val, char **str);

     int
     dwarf_get_DSC_name(unsigned val, char **str);

     int
     dwarf_get_EH_name(unsigned val, char **str);

     int
     dwarf_get_END_name(unsigned val, char **str);

     int
     dwarf_get_FORM_name(unsigned val, char **str);

     int
     dwarf_get_ID_name(unsigned val, char **str);

     int
     dwarf_get_INL_name(unsigned val, char **str);

     int
     dwarf_get_LANG_name(unsigned val, char **str);

     int
     dwarf_get_LNE_name(unsigned val, char **str);

     int
     dwarf_get_LNS_name(unsigned val, char **str);

     int
     dwarf_get_MACINFO_name(unsigned val, char **str);

     int
     dwarf_get_OP_name(unsigned val, char **str);

     int
     dwarf_get_ORD_name(unsigned val, char **str);

     int
     dwarf_get_TAG_name(unsigned val, char **str);

     int
     dwarf_get_VIRTUALITY_name(unsigned val, char **str);

     int
     dwarf_get_VIS_name(unsigned val, char **str);

DESCRIPTION

     These functions return the symbolic name of a numeric DWARF constant.

     Argument val specifies the numeric value whose symbolic name is desired.

     Argument str should point to a location which will hold the returned NUL-terminated string containing the symbolic name of the specified
     value.

     The list of functions and the DWARF constants that they accept are:

     dwarf_get_ACCESS_name()	  DW_ACCESS_* constants.
     dwarf_get_AT_name()	  DW_AT_* constants.
     dwarf_get_ATE_name()	  DW_ATE_* constants.
     dwarf_get_CC_name()	  DW_CC_* constants.
     dwarf_get_CFA_name()	  DW_CFA_* constants.
     dwarf_get_CHILDREN_name()	  DW_CHILDREN_* constants.
     dwarf_get_DS_name()	  DW_DS_* constants.
     dwarf_get_DSC_name()	  DW_DSC_* constants.
     dwarf_get_EH_name()	  DW_EH_PE_* constants.
     dwarf_get_END_name()	  DW_END_* constants.
     dwarf_get_FORM_name()	  DW_FORM_* constants.
     dwarf_get_ID_name()	  DW_ID_* constants.
     dwarf_get_INL_name()	  DW_INL_* constants.
     dwarf_get_LANG_name()	  DW_LANG_* constants.
     dwarf_get_LNE_name()	  DW_LNE_* constants.
     dwarf_get_LNS_name()	  DW_LNS_* constants.
     dwarf_get_MACINFO_name()	  DW_MACINFO_* constants.
     dwarf_get_OP_name()	  DW_OP_* constants.
     dwarf_get_ORD_name()	  DW_ORD_* constants.
     dwarf_get_TAG_name()	  DW_TAG_* constants.
     dwarf_get_VIRTUALITY_name()  DW_VIRTUALITY_* constants.
     dwarf_get_VIS_name()	  DW_VIS_* constants.

RETURN VALUES

     These functions return DW_DLV_OK on success. If the DWARF constant denoted by argument val is not recognized, these function return
     DW_DLV_NO_ENTRY.

SEE ALSO

     dwarf(3)

BSD
								  April 22, 2011							       BSD
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