Very Computer

> How do i write an infinite loop to monitor the creation and removal of
> .pdf or .PDF files under the current directory.

> How do i write an infinite loop to monitor the creation and removal of
> .pdf or .PDF files under the current directory. Every 15 seconds i
> want to display a list of those filenames created or removed after the
> previous display. Without loss of practical significance of this
> utility, I want to assume that the time interval between creation of a
> .PDF or .pdf file and removal of a .PDF or .pdf file is over 15
> seconds, which means that it's unnecessary for my script to handle the
> situation where creation of a file is followed by immediate removal of
> a file. I think i need to use the comm or comm commands here.

> Unix machine hasn't got that command

> How do i write an infinite loop to monitor the creation and removal of
> .pdf or .PDF files under the current directory. Every 15 seconds i want

> to display a list of those filenames created or removed after the
> previous display. Without loss of practical significance of this
> utility, I want to assume that the time interval between creation of a
> .PDF or .pdf file and removal of a .PDF or .pdf file is over 15
> seconds, which means that it's unnecessary for my script to handle
> the situation where creation of a file is followed by immediate removal

> of a file. I think i need to use the comm or comm commands here.

> > How do i write an infinite loop to monitor the creation and removal of
> > .pdf or .PDF files under the current directory. Every 15 seconds i want

> > to display a list of those filenames created or removed after the
> > previous display. Without loss of practical significance of this
> > utility, I want to assume that the time interval between creation of a
> > .PDF or .pdf file and removal of a .PDF or .pdf file is over 15
> > seconds, which means that it's unnecessary for my script to handle
> > the situation where creation of a file is followed by immediate removal

> > of a file. I think i need to use the comm or comm commands here.

> Something like this (untested) would be the simplest:

> ls *.pdf *.PDF > old
> while :
> do
>    sleep 15
>    ls *.pdf *.PDF > new
>    newOnly=`comm -13 old new`
>    oldOnly=`comm -23 old new`
>    echo "created: $newOnly"
>    echo "removed: $oldOnly"
>    mv new old
> done

> Check the "comm" man page for the arguments.

>>>How do i write an infinite loop to monitor the creation and removal of
>>>.pdf or .PDF files under the current directory. Every 15 seconds i want

>>>to display a list of those filenames created or removed after the
>>>previous display. Without loss of practical significance of this
>>>utility, I want to assume that the time interval between creation of a
>>>.PDF or .pdf file and removal of a .PDF or .pdf file is over 15
>>>seconds, which means that it's unnecessary for my script to handle
>>>the situation where creation of a file is followed by immediate removal

>>>of a file. I think i need to use the comm or comm commands here.

>>Something like this (untested) would be the simplest:

>>ls *.pdf *.PDF > old
>>while :
>>do
>>        sleep 15
>>        ls *.pdf *.PDF > new
>>        newOnly=`comm -13 old new`
>>        oldOnly=`comm -23 old new`
>>        echo "created: $newOnly"
>>        echo "removed: $oldOnly"
>>        mv new old
>>done

>>Check the "comm" man page for the arguments.

> Thanks Ed for your advice, that is similiar to what i have written
> here. However, i have been testing my syntax, which is similiar to
> yours, and still doesn't seem to work. Have a look at my code ,and tell
> me if you see anything out of ordinary.

>    UW PICO(tm) 3.5                  File: pdf.sh

> ls *.[pP][dD[fF] >older 2>/dev/null

> > How do i write an infinite loop to monitor the creation and removal of
> > .pdf or .PDF files under the current directory. Every 15 seconds i want

> > to display a list of those filenames created or removed after the
> > previous display. Without loss of practical significance of this
> > utility, I want to assume that the time interval between creation of a
> > .PDF or .pdf file and removal of a .PDF or .pdf file is over 15
> > seconds, which means that it's unnecessary for my script to handle
> > the situation where creation of a file is followed by immediate removal

> > of a file. I think i need to use the comm or comm commands here.

> Something like this (untested) would be the simplest:

> ls *.pdf *.PDF > old
> while :
> do
>    sleep 15
>    ls *.pdf *.PDF > new
>    newOnly=`comm -13 old new`
>    oldOnly=`comm -23 old new`
>    echo "created: $newOnly"
>    echo "removed: $oldOnly"
>    mv new old
> done

> Check the "comm" man page for the arguments.

> >>>How do i write an infinite loop to monitor the creation and removal of
> >>>.pdf or .PDF files under the current directory. Every 15 seconds i want

> >>>to display a list of those filenames created or removed after the
> >>>previous display. Without loss of practical significance of this
> >>>utility, I want to assume that the time interval between creation of a
> >>>.PDF or .pdf file and removal of a .PDF or .pdf file is over 15
> >>>seconds, which means that it's unnecessary for my script to handle
> >>>the situation where creation of a file is followed by immediate removal

> >>>of a file. I think i need to use the comm or comm commands here.

> >>Something like this (untested) would be the simplest:

> >>ls *.pdf *.PDF > old
> >>while :
> >>do
> >>   sleep 15
> >>   ls *.pdf *.PDF > new
> >>   newOnly=`comm -13 old new`
> >>   oldOnly=`comm -23 old new`
> >>   echo "created: $newOnly"
> >>   echo "removed: $oldOnly"
> >>   mv new old
> >>done

> >>Check the "comm" man page for the arguments.

> > Thanks Ed for your advice, that is similiar to what i have written
> > here. However, i have been testing my syntax, which is similiar to
> > yours, and still doesn't seem to work. Have a look at my code ,and tell
> > me if you see anything out of ordinary.

> >    UW PICO(tm) 3.5                  File: pdf.sh

> > ls *.[pP][dD[fF] >older 2>/dev/null

> You're missing a closing square bracket ] after the "D" above.

> > while true

> > do

> > sleep 15echo "No pdf files have been created or removed in the last 15

> The above is missing a newline and a closing double quote ".

> > ls *.[pP][dD[fF] >newer 2>/dev/null

> You're missing a closing square bracket ] after the "D" above.

> > count='comm -13 $A $B | wc l'

> The above forward ticks ' should be back ticks `. Or use $(...) syntax.

> > else    if [ $count -gt 0 ]; then
> >         echo "No pdf files have been created or removed in the last
> > 1515
> >         seconds"conds"

> The above seems to have an extra double quote in addition to messed up
> newlines.

> >         comm -23 $A $B$A $B comm -12

> The above is just messed up.

> >         comm -13 $A $B

> > else
> >         echo" The following pdf file(s) have been removed in the last
> > 15
> >               seconds"

> Messed up newlines.

> > unalias pdf.sh

> What's the above supposed to do?

> > done

> > If you can test the code on your unix machine cutting and pasting, and
> > seeing what's causing the issue. I'm interesting to see what i am doing
> > wrong. Appreciate it bud!

> Regards,

>    Ed.

<snip>
>>>count='comm -13 $A $B | wc l'

>>The above forward ticks ' should be back ticks `. Or use $(...) syntax.

> I know it is a mess, but this is the code that somebody else said to me
> was good. I am still having problems with my syntax

> count='comm -13 $A $B | wc l'

> It's telling me that count is unexpected in my code