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Bugger! I need to call it a night and go to bed.

Test should be AND rather than OR.


if [[ $last_value != "x" && $last_value != $new_value ]]

Right about bash, however Ksh does the right thing and this will work in ksh.


$ cat t19
#!/usr/bin/env ksh
x=
echo hello | read x
echo $x

$ t19
hello

Oops, typo.

The [[ needs to have a trailing space.


if [[ $last_value != "x" || $last_value != $new_value ]]


Sorry bout that.

Cool -- glad you found something that works for you. Yes, change the if a bit to skip if last_value is 'x' or whatever you initialised it to. Something like:


if [[ $last_value != "x" && ...

Good -- a single shot command is much easier to deal with.

I miss read the grep -- realise now that you are ditching the 'name' line. If the value that you are interested in is always the last...

I assumed that your command ran a single time, though looking back at your example maybe it executes continuously.

Small changes:

last_value=x
log_file=/tmp/log.file

your-command-string |...

Try something like this:



last_value=x
log_file=/tmp/log.file
while true
do
your-command-string | read new_value
if [[ $last_value != $new_value ]]
then
echo "$(date)...