One approach to dividing a large file into segments based on their length in bytes using a shell script could be:
Determine the total size of the file using the stat
command:
filesize=$(stat -c "%s" largefile.txt)
Define a segment size in bytes:
segsize=1000000
# e.g. 1MB
Calculate the number of segments required to process the entire file:
numsegs=$(expr $filesize / $segsize)
Use a loop to iterate over each segment and process it:
for ((i = 0; i <= $numsegs; i++))
do
startpos=$(expr $i \* $segsize)
endpos=$(expr $startpos + $segsize)
if [ $endpos -gt $filesize ]
then
endpos=$filesize
fi
segment=$(printf "%s_%05d" "largefile.txt" $i)
dd if=largefile.txt of=$segment bs=1 skip=$startpos count=$(expr $endpos - $startpos)
done
In this script, the loop iterates over each segment by calculating the start and end positions for each segment. Then, it uses the dd
command to create a new file for each segment by extracting the specified number of bytes from the input file. The output file name is created using a format string to include the original filename and segment index. Finally, the if
condition checks if the end position exceeds the file size and adjusts it accordingly for the last segment.
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Asked: 2021-09-26 11:00:00 +0000
Seen: 9 times
Last updated: Dec 29 '21
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