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Top Forums Shell Programming and Scripting if statement with two conditions -e, && Post 74925 by vgersh99 on Tuesday 14th of June 2005 11:50:44 AM
Old 06-14-2005
Quote:
Originally Posted by yongho
Question: I just started learning shell scripting a few days ago and I was under the assumption that you didn't need to typeset anything.
you don't.
if you don't,

count=$((count + 1))
becomes
count=$(($count + 1))

Quote:
Originally Posted by yongho
One of my previous counters looked like this (in a while statement, not an if statement:
var1=`expr $var1 + $var2`
..and it worked.
this NOT using ksh/bash builtin capabilities for doing simple integer math.
Quote:
Originally Posted by yongho
But when I tried the expr command in the if statement, it didn't increment at all. Would you know why this is? Could it be because once you enter an if statement, you must use different rules?
nope, that's not it.
are you saying that the 'expr ' increment did not work, but the 'count=$((count+1))' did?
there must be something else different in your 'while' loop.
is your 'while' loopbeing piped with data?
 

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SPI_EXECUTE_PLAN(3)					  PostgreSQL 9.2.7 Documentation				       SPI_EXECUTE_PLAN(3)

NAME
SPI_execute_plan - execute a statement prepared by SPI_prepare SYNOPSIS
int SPI_execute_plan(SPIPlanPtr plan, Datum * values, const char * nulls, bool read_only, long count) DESCRIPTION
SPI_execute_plan executes a statement prepared by SPI_prepare or one of its siblings. read_only and count have the same interpretation as in SPI_execute. ARGUMENTS
SPIPlanPtr plan prepared statement (returned by SPI_prepare) Datum * values An array of actual parameter values. Must have same length as the statement's number of arguments. const char * nulls An array describing which parameters are null. Must have same length as the statement's number of arguments. n indicates a null value (entry in values will be ignored); a space indicates a nonnull value (entry in values is valid). If nulls is NULL then SPI_execute_plan assumes that no parameters are null. bool read_only true for read-only execution long count maximum number of rows to return, or 0 for no limit RETURN VALUE
The return value is the same as for SPI_execute, with the following additional possible error (negative) results: SPI_ERROR_ARGUMENT if plan is NULL or invalid, or count is less than 0 SPI_ERROR_PARAM if values is NULL and plan was prepared with some parameters SPI_processed and SPI_tuptable are set as in SPI_execute if successful. PostgreSQL 9.2.7 2014-02-17 SPI_EXECUTE_PLAN(3)
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