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zbled
Apprentice
Joined: 18 Jun 2002
Posts: 216
Location: Bukowski's Piano Bar
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 Posted: Sat Oct 05, 2002 7:42 pm Post subject: read and sum values from a textfile using the bash |
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hi everybody, i'm pretty new to bash things, so i hope you can help me:
due to my provider i have to watch my upload and download volume. I want to build a little script, which should show the amount of bytes up and downloaded for a month:
to get the actual down- and upload written in a textfile when shutting down the workstation, i'm going to execute the following commands:
/sbin/ifconfig eth0 | grep "RX bytes" | gawk '{print $6}' | gawk -F':' '{print $2}' >> updown
/sbin/ifconfig eth0 | grep "RX bytes" | gawk '{print $2}' | gawk -F':' '{print $2}' >> updown
so far's everything okay, but i don't know how to read and sum the values written in the file updown. is there any bash command to open the file and sum the values till the EOF?
thanks in advance |
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nikai
Apprentice
Joined: 02 Oct 2002
Posts: 270
Location: Kitzbühel, Austria
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| Posted: Sat Oct 05, 2002 10:28 pm Post subject: Re: read and sum values from a textfile using the bash |
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| zbled wrote: | | i don't know how to read and sum the values written in the file updown. is there any bash command to open the file and sum the values till the EOF? |
Hm, if I understand correctly you want something like
| Code: | | awk '{print x+=$1}' updown |
Is that right? |
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sa
Guru
Joined: 10 Jun 2002
Posts: 450
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| Posted: Sat Oct 05, 2002 11:13 pm Post subject: |
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something like this?
| Code: |
#!/bin/bash
file=~/updown
j=1
n=`cat $file | wc | awk '{print $1}'`
until [ $j -gt $n ]
do
total=$(( $total + `head -$j $file | tail -1`))
j=$(( $j + 1))
done
echo $total
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you might want to check out:http://people.ethz.ch/~oetiker/webtools/mrtg/
not sure if its what you need, but its pretty neat. |
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sa
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Joined: 10 Jun 2002
Posts: 450
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| Posted: Sat Oct 05, 2002 11:15 pm Post subject: |
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ooo, that awk thing is pretty cool  |
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zbled
Apprentice
Joined: 18 Jun 2002
Posts: 216
Location: Bukowski's Piano Bar
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| Posted: Sat Oct 05, 2002 11:36 pm Post subject: |
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yep, that's what i wanted, but this code is much quicker than the loop ;)
| Quote: | | sum=0; for i in `cat /usr/local/save/updown`; do ((sum+=i));done; sum=$[$sum/1048576] |
anyways, there's still one problem left. when calculating these values (+), the sum becomes negativ
164377428
+340828451
+164377488
+340828573
+164377488
+340828573
+164377548
+340828635
+164377643
+340828762
+164377769
+340829127
| Quote: | zbled@heisl zbled $ sum=0; for i in `cat /usr/local/save/updown`; do ((sum+=i));done; sum=$[$sum/1048576]; echo $sum
-1205 |
can you still help me? |
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sa
Guru
Joined: 10 Jun 2002
Posts: 450
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| Posted: Sun Oct 06, 2002 12:33 am Post subject: |
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just tried that in my shell, zsh and it works properly mabey bash is broken?
you could do as nikai suggests:
| Code: |
sa@g ~ % total=`awk '{print x+=$1/1048576}' updown`
sa@g ~ % echo $total
156.763
481.802
638.564
963.604
1120.37
1445.41
1602.17
1927.21
2083.97
2409.01
2565.77
2890.81
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but then you have to extract the last word from $total
good luck,
sa |
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zbled
Apprentice
Joined: 18 Jun 2002
Posts: 216
Location: Bukowski's Piano Bar
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| Posted: Sun Oct 06, 2002 12:44 am Post subject: |
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are there any switches for the bash, cause mine seems to be restricted to a range between - 2000 to 2000?
[edit] i just emerged zsh and i'm getting the same values :(... seems that it's nothing to do with the shell [/edit] |
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