#!/bin/bash
for file in transactions.cor.2015-0[56789]*
do [[ "$file" != ${file##*.chk.} ]] && continue
if [[ $tempdate = ${file:17:10} ]]
then count_505001=$((count_505001 + $(zless "$file" | fgrep -c 505001)))
count_602001=$((count_602001 + $(zless "$file" | fgrep -c 602001)))
continue
fi
if [[ tempdate != "" ]]
then echo "Count for 505001: $count_505001 on date: $tempdate"
echo "Count for 602001: $count_602001 on date: $tempdate"
fi
tempdate=${file:17:10}
count_505001=$(zless "$file" | fgrep -c 505001)
count_602001=$(zless "$file" | fgrep -c 602001)
done
if [[ tempdate != "" ]]
then echo "Count for 505001: $count_505001 on date: $tempdate"
echo "Count for 602001: $count_602001 on date: $tempdate"
fi
Hi Don,
[[ tempdate != "" ]] will always be true since the string tempdate is never "".
#!/bin/bash
for file in transactions.cor.2015-0[56789]*
do [[ "$file" != ${file##*.chk.} ]] && continue
if [[ $tempdate = ${file:17:10} ]]
then count_505001=$((count_505001 + $(zless "$file" | fgrep -c 505001)))
count_602001=$((count_602001 + $(zless "$file" | fgrep -c 602001)))
continue
fi
if [[ tempdate != "" ]]
then echo "Count for 505001: $count_505001 on date: $tempdate"
echo "Count for 602001: $count_602001 on date: $tempdate"
fi
tempdate=${file:17:10}
count_505001=$(zless "$file" | fgrep -c 505001)
count_602001=$(zless "$file" | fgrep -c 602001)
done
if [[ tempdate != "" ]]
then echo "Count for 505001: $count_505001 on date: $tempdate"
echo "Count for 602001: $count_602001 on date: $tempdate"
fi
Hi Don, [[ tempdate != "" ]] will always be true since the string tempdate is never "".
Hi Aia, $tempdate will expand to an empty string inside the for loop the first time a filename matching transactions.cor.2015-0[56789]* is found that does not contain the string .chk..
$tempdate will expand to an empty string after the for loop completes if, and only if, no filenames matching transactions.cor.2015-0[56789]* were found that did not contain the string .chk., or no filenames matching transactions.cor.2015-0[56789]* were found.
There should also be a check to be sure that at least one file matched the pattern transactions.cor.2015-0[56789]* (or the bash option that causes a non-matching pattern to expand to an empty list should be specified). I normally use ksh instead of bash. With ksh, I would avoid this problem by changing:
Code:
for file in transactions.cor.2015-0[56789]*
to:
Code:
for file in ~(N:transactions.cor.2015-0[56789]*)
which will not execute the loop if there are no matches. I always forget the option that enables this feature in bash and have to look it up, but for recent versions of bash, it is:
Code:
shopt -s nullglob
for file in transactions.cor.2015-0[56789]*
With single square brackets, you need the <dollar-sign> and quotes:
Code:
if [ "$template" != "" ]
because the shell is parsing operands to a built-in. But, double square brackets are part of the shell command language, not a built-in, so the <dollar-sign> and quotes are optional. All of the following produce the same results:
Code:
if [[ template != "" ]]
if [[ $template != "" ]]
if [[ "$template" != "" ]]
taking the then branch if $template expands to a non-empty string. But the following are equivalent to each other, but, unlike the above three commands, always take the then branch:
Code:
if [[ "template" != "" ]]
if [[ 'template' != "" ]]
[...] But, double square brackets are part of the shell command language, not a built-in, so the <dollar-sign> and quotes are optional. All of the following produce the same results:
Code:
if [[ template != "" ]]
if [[ $template != "" ]]
if [[ "$template" != "" ]]
Hi Don,
First, thank you for taking the time.
I understand that the properties of the double [[ does not suffer of the same issues that the single [ or test. It does not do word splitting nor globing, therefore you do not need to double quote the left-hand side of it and you only quote the right side if you do not want a pattern match, instead of a string comparison.
However, if [[ template != "" ]] does not expand since it is a literal string. How can it be the same that $template with or without quotes?
Perhaps, I can demonstrate my question better with a test.
$ ./test_test
+ template=
+ [[ template != '' ]] <-- it is the literal string template
+ echo 'success!'
success! <-- this should be failure! if it were dereferencing
+ [[ '' != '' ]] <-- dereferenced to the value in template
+ echo 'failure!'
failure!
Could you tell me when this if [[ template != "" ]] became an arithmetic expression?
As far as I understand it it is a string conditional expression. Maybe that's what I am missing. But if this were the case, then I would have to still believe that:
Quote:
Code:
if [[ template != "" ]]
if [[ $template != "" ]]
if [[ "$template" != "" ]]
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