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Editorial Team
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Asked: 2026-06-14T06:49:57+00:00

I have cronjob to run a script every day in specific time. The script

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I have cronjob to run a script every day in specific time. The script is for conversion a large file (about 2GB) in specific folder. The problem is that not every day my coleague put the file in the folder before the time, written as cronjob.

Please help me to add commands in the script or to write second script for:

  1. Check if the file exists in the folder.
  2. If the previous action is true, check the file size every minute. (I would like to avoid conversion of still incomming large file).
  3. If filesize stays unchanged for 2 minutes, start the script for conversion.

I give you the important lines of the script so far:

cd /path-to-folder
for $i in *.mpg; do avconv -i "$i" "out-$i.mp4" ; done

10x for the help!

NEW CODE AFTER COMMENTS:

There is file in the folder!

#! /bin/bash


cdate=$(date +%Y%m%d)
dump="/path/folder1"
base=$(ls "$dump")

if [ -n "$file"]
then
    file="$dump/$base"
    size=$(stat -c '%s' "$file")
    count=0
    while sleep 10
    do
        size0=$(stat -c '%s' "$file")
        if [ $size=$size0 ]
        then $((count++))
             count=0
        fi
        if [ $count = 2 ]
        then break
        fi
    done
    # file has been stable for two minutes. Start conversion.

CONVERSION CODE

fi

MESSAGE IN TERMINAL: Maybe error???

script.sh: 17: script.sh: arithmetic expression: expecting primary: "count++"
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1 Answer

  1. Editorial Team

    Well, I finally made some working code as follows:

    #!/bin/bash

cdate=$(date +%Y%m%d)
folder1="/path-to-folder1"

cd $folder1

while file=$(ls "$folder1")
      [ -z "$file" ]
do sleep 5 && echo "There in no file in the folder at $cdate."
done

echo "There is a file in folder at $cdate"
size1=$(stat -c '%s' "$file")
echo "The size1 is $size1 at $cdate"
size2=$(stat -c '%s' "$file")
echo "The size2 is $size2 at $cdate"
if [ $size1 = $size2 ]
then
echo "file is stable at $cdate. Do conversion."

    Is the next line the right one to loop the same script???

    else sh /home/user/bin/exist-stable.sh
fi

    The right code after comments below is

    else exec /home/user/bin/exist-stable.sh
fi
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