dzen2 and sleep statement

monotiz · 2012-05-06 08:31:54

Hi,
I'd like to know how to solve my doubt.
I wrote a script for dzen2 like this:

#!/bin/sh
while true; do
func1() {......}
func2() {......}
mail_check() {?????}
echo `func1 && func2 && mail_check` 
sleep 5
done | dzen2

All functions are called every 5 seconds, but I'd like to run mail_check() every 60 seconds (for example).
How can I do it?

Thank you.

Last edited by monotiz (2012-05-06 08:32:58)

Ashren · 2012-05-06 09:55:23

You could use something like this:

#!/bin/bash

sle () {
tick=1
while true; do
        sleep 10
          tjek="Sleep 10 secs has run $tick times"
          tick=$(($tick+1))
done
}

sle &
jpid=$!
trap 'kill -9 $jpid; exit' INT TERM EXIT

while true; do

        sleep 2
        echo $tjek

done

guelfi · 2012-05-06 09:55:31

Put it in another backgrounded shell:

#!/bin/sh
while true; do
  {
    echo $(func1 && func2) 
    sleep 5
  } &
  {
    echo $(mail_check)
    sleep 60
  } &
done | dzen2

monotiz · 2012-05-06 11:01:13

guelfi wrote:

Put it in another backgrounded shell:

#!/bin/sh
while true; do
  {
    echo $(func1 && func2) 
    sleep 5
  } &
  {
    echo $(mail_check)
    sleep 60
  } &
done | dzen2

It doesn't work...

Trilby · 2012-05-06 11:40:37

The problem with these examples is they each run a loop in a subshell that sets a variable but then tries to access that variable in the parent shell. AFAIK this is not possible in bash ... which is why they fail or produce no ouput - they are "echoing" an empty variable.

One work around is to have the individual while loops echo their data to a temp file rather than saving it to a variable, then have the main loop cat those files.

One possible example:

# define functions here ...
while :; do func1 > /tmp/battery; sleep 1; done
while :; do func2 > /tmp/time; sleep 30; done
while :; do func3 > /tmp/mail; sleep 60; done
while :; do echo $(cat /tmp/battery /tmp/time /tmp/mail); sleep 1; done

Alternately this is very easy to do in C, which is how I rewrote my dwm status line and saved a LOT on resources while still having a rapid update rate.

Edit: another, potentially cleaner, method would be to use a condtional inside a single loop such as

last_email_check=0
while :; do
    if [ last_email_check + 60 -lt $(date  +%s) ]; then
        email_string=$(func3)
        last_email_check = $(date +%s)
    fi
    # more here to set other variables from func1 and func2
    echo $email_string $func1_string $func2_string
    sleep 1
done

Last edited by Trilby (2012-05-06 11:56:25)

Ashren · 2012-05-06 11:58:16

I can see my first example does not work.

This OTOH does:

#!/bin/bash

sle () {
tick=1
while true; do
      sleep 10
      echo "Sleep 10 secs has run $tick times"
      tick=$(($tick+1))
      export tjek=$1
done
}

sle &
jpid=$!
trap 'kill -9 $jpid; exit' INT TERM EXIT

while true; do

    sleep 2 
    echo $tjek

done

Last edited by Ashren (2012-05-06 12:30:08)

Trilby · 2012-05-06 13:09:54

Ashren, the main loop still does not have access to the tjek variable. It echos a blank line every two seconds as tjek is not set within the scripts scope.

This does echo the "sleep 10 sec ..." part properly, but that is only from within the sle function. This would not be useful for giving output to dzen as the output to be updated every 60 seconds would only be displayed for 1 second every 60 seconds.

I'm pretty sure the goal is to have it updated every 60s but still displayed all the time.

moetunes · 2012-05-25 09:56:11

monotiz wrote:

Hi,
I'd like to know how to solve my doubt.
I wrote a script for dzen2 like this:
#!/bin/sh
while true; do
func1() {......}
func2() {......}
mail_check() {?????}
echo `func1 && func2 && mail_check` 
sleep 5
done | dzen2
All functions are called every 5 seconds, but I'd like to run mail_check() every 60 seconds (for example).
How can I do it?
Thank you.

With a bit of bash experience this can be simple. Here's an example:

#!/bin/bash
# seperate timings

int=0
# print 3 variables until sixteen seconds
# change two variables every second
# change the third every five seconds
while [ $int -lt 16 ]; do
    answer1=$(printf "answer1 $int") # replace printf with function
    answer2=$(printf "answer2 $int") # replace printf with function
    [ $(($int%5)) == 0 ] && mail_check=$(printf "mail_check $int") # replace printf with function
    printf "$answer1 $answer2 $mail_check"
    sleep 1
    let 'int=int+1'
done | dzen2

exit 0

HTH

Arch Linux

#1 2012-05-06 08:31:54

dzen2 and sleep statement

#2 2012-05-06 09:55:23

Re: dzen2 and sleep statement

#3 2012-05-06 09:55:31

Re: dzen2 and sleep statement

#4 2012-05-06 11:01:13

Re: dzen2 and sleep statement

#5 2012-05-06 11:40:37

Re: dzen2 and sleep statement

#6 2012-05-06 11:58:16

Re: dzen2 and sleep statement

#7 2012-05-06 13:09:54

Re: dzen2 and sleep statement

#8 2012-05-25 09:56:11

Re: dzen2 and sleep statement

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