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Increment #'s in text file hourly

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# 1  
Old 06-16-2010
Increment #'s in text file hourly
I have a text file with a number "001". I am trying to change this number every hour and increment by "1". So every hour it would add +1 to that number. I am able to change the file with sed but unable to have it increment it by "1" without me adding that to the sed command. Any help is appreciated.

sed 's/dist01/dist02/g' myfile

Thank You..
# 2  
Old 06-16-2010
Quote:
Originally Posted by noob33
I have a text file with a number "001". I am trying to change this number every hour and increment by "1". So every hour it would add +1 to that number. I am able to change the file with sed but unable to have it increment it by "1" without me adding that to the sed command. Any help is appreciated.

sed 's/dist01/dist02/g' myfile

Thank You..
Code:
number=`grep -o [0-9]* myfile`
newnumber=$((${number}+1))
sed 's/${number}/${newnumber}/g' myfile

# 3  
Old 06-16-2010
Code:
$ cat data.dat
001
$

Code:
#!/bin/sh

while true; do

oldnr=$(sed 's/^0*//' data.dat)
newnr=$(($oldnr+1))
printf "%03d\n" $newnr > data.dat
sleep 3600

done

# 4  
Old 06-16-2010
Quote:
Originally Posted by pseudocoder
Code:
oldnr=$(sed 's/^0*//' data.dat)


There's no need for sed (or any external command):
Code:
file=data.dat
read num < "$file"
printf "%d\n" "$(( $num + 1 ))" > "$file"

This User Gave Thanks to cfajohnson For This Post:
pseudocoder
# 5  
Old 06-16-2010
or eventually
Code:
#!/bin/sh

while true; do

oldnr=$(sed 's/^0*//' data.dat)
newnr=$(($oldnr+1))
newnrwithzeros=$(printf "%03d\n" $newnr)
sed -ie "s/.*/$newnrwithzeros/" data.dat
sleep 3600

done

# 6  
Old 06-16-2010
Hi, Thank You for all the help so far. The problem I am having is getting this number to increment up by 1. I am not sure if its the "" but it does not seem to work correctly.


versionCode="1" and I need the 1 to increment +1 every time the script runs.



Thanks again.
Last edited by noob33; 06-16-2010 at 09:42 PM..
# 7  
Old 06-16-2010
Quote:
Originally Posted by noob33
The problem I am having is getting this number to increment up by 1. I am not sure if its the "" but it does not seem to work correctly.


versionCode="1" and I need the 1 to increment +1
Code:
versionCode=$(( $versionCode + 1 ))
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