debug help on BASH arrays and for looop.

myint45 · 02-12-2008, 12:54 PM

ok, here's the output of "find /store -name .lock.pid -exec cat {} \;"
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:02 2008
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:04 2008
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:04 2008
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:02 2008
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:02 2008
chvpklnxq1dev.chvpk.chevrontexaco.net|15734|Tue Feb 12 02:00:04 2008

I'm trying to extract the date so that I can compare it to the current date, using the date command. And then I want to see if they match on each occasion; this is what I've written:
#!/bin/bash
chkdt1=$(date | awk -F " " '{print $2,$3}')
#echo "${chkdt1}";
declare -a lock=$(find /store -name .lock.pid -exec cat {} \

;
chkdt=$(echo "$lock[1]" | awk -F" " '{print $2,$3}');
echo "$lock";
for i in "$lock"
do
if [ "${chkdt}X" != "${chkdt1}X" ]
then
echo "dates don't match";
else
echo "dates do match";
fi
done
============

I'm getting dates don't match; which they should. But HERE'S THE REAL QUESTION...WHY IS IT THAT THE ARRAY IS NOT WORKING..BECAUSE THE $LOCK ECHO IS RETURNING THE WHOLE array instead of the $lock[1] I'm addressing?

osor · 02-12-2008, 01:32 PM

The arrays aren’t working because you although you declare lock to be an array, you end up assigning to it as a scalar. So you have $lock[0] containing the entire output, and $lock[1] being blank.

Btw, you don’t need arrays for this:

Code:

#!/bin/bash

chkdt1=$(date | awk -F " " '{print $2,$3}')

find /store -name .lock.pid -exec cat {} \; | while read line; do
	chkdt=$(echo $line | awk -F" " '{print $2,$3}')
	if [ "${chkdt}X" != "${chkdt1}X" ]; then
		echo "dates don't match";
	else
		echo "dates do match";
	fi
done

You can clean this up further (getting rid of awk) to obtain:

Code:

#!/bin/bash

chkdt1=$(date | cut -d' ' -f2,3)

find /store -name .lock.pid -exec cat {} \; | while read pref mon day suf; do
	if [ "${mon} ${day}X" != "${chkdt1}X" ]; then
		echo "dates don't match";
	else
		echo "dates do match";
	fi
done

ghostdog74 · 02-12-2008, 10:27 PM

Code:

find /store -name .lock.pid -exec cat {} \; | awk 'BEGIN { FS="[ |]"
   current=strftime("%b %d %Y",systime())
}
current == $4" "$5" "$7
' "file"