LinuxQuestions.org - How to divide file by half in Linux?

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How to divide file by half in Linux?

I want to move 650Meg file from computer to computer via MP3 Player (512Meg drive) and
I need to divide the file under linux. How to do it?.

See the

Code:

man split

pages.

Also,

Code:

man cat

to put the bits back together again.

Dave

I forgot to add that I have to merge this file in Windows so it would have to be some
packer that works with windows(rar, arj, zip etc.)

that's not gonna happen.. you need to use a network of some kind..null modem, crossover cable, hub/switch, whatever.. something... split and cat are excellent tools... i often use it for emailing large file via gmail... just send them in several small pieces.. the only other way i see to do it is if there is a FAT partition on the windows machine, you could use a livecd (knoppix, dsl, etc) to boot.. copy the files over, cat them back together, then boot windows and have the full file...

even if you temporarily added a second hard drive the other machine for this purpose, it would be easy.

I don't know of any apps for Windows than will pice together sections of a file though...

Thanks that's some thought... But I discovered RAR in linux. One can divide files
with it as well, but your way is good as well.

As an FYI, you can do a pseudo-cat under windows:

Code:

copy /b file1+file2 file3

wow... if that works that's cool, Matir... I shall try it.

I was also unaware that WinRAR can do that...

i made a script before that will split a file to specified size, split a file to specified number of parts, combine the files, make windows batch file to combine the files in windows

Code:

#!/bin/bash



###########################################################

#

# isplit        splits and combine files

# 

# Made By : ibrahim riad  (Heema)

#

###########################################################





###########################################################

# Main

###########################################################



if [ $# -eq 0 ];then

        echo ""

        echo "Usage : isplit [option] filename"

        echo "option : -s        split file to specified size"

        echo "        -p        split file to specified parts"

        echo "        -c        combine the files"

        echo "        -w        make windows batch file to combine the files in windows

"





        echo ""

        exit

fi



if [ $# -eq 2 ];then

        filepath=$2

        

fi



#echo "Filepath : $filepath"

#echo "num : $#"



###########################################################



case "$1" in



###########################################################

# Split file

###########################################################



-s)

        echo -n "Enter desired size (MB) : "

        read size

        

        split -b "$size"m "$filepath" "$filepath".



        echo "$filepath" > $HOME/.ksplittemp

;;



###########################################################

# Split file to specified parts

###########################################################



-p)

                

        echo -n "Enter desired parts : "

        read parts

        

        info=$(ls -l $filepath | awk '{print $5}')

        

        partsize=$((($info/$parts)+1))



        split -b "$partsize" "$filepath" "$filepath".



        echo "$filepath" > $HOME/.ksplittemp



;;



###########################################################

# Combine the files

###########################################################



-c)

                

        BASE=$(basename "$filepath" | cut -d . -f1)

        

        guess=$(cat $HOME/.ksplittemp)



        guessname=$(basename "$guess")

        

        

        echo -n "Do you want the name of the output to be $guessname  (y/n) : "

        read answer

        

        if [ "$answer" == "y" ];then

                echo ""

        else

                echo -n "Enter output name : "

                read outputname

                cat "$BASE".* > "$outputname"

        fi





        cat "$BASE".* > "$guessname"

        

;;



###########################################################

# Make windows batch file to combine the files in win$

###########################################################



-w)

        

        basefile=$(basename "$filepath" | cut -d . -f1)

        

        guessing=$(cat $HOME/.ksplittemp)



        guessingname=$(basename $guessing)



        

        echo -e "@ echo off\n" > winbatch.bat

        echo -e "clr\n" >> winbatch.bat

        echo -e "\n" >> winbatch.bat

        echo -e "copy /B $basefile.a* $guessingname \n" >> winbatch.bat

        echo -e "\n" >> winbatch.bat

        echo -e "echo on\n" >> winbatch.bat 



;;

        

*)

        echo -e "\033[0;31mThis format is not supported\033[0m"

;;



esac

Looks like a nice and useful script. Mind me (or yourself) adding it to http://shellscripts.org?

Greetings,
Benjamin

Quote:

Originally posted by blindcoder
Looks like a nice and useful script. Mind me (or yourself) adding it to http://shellscripts.org?

Greetings,
Benjamin

I added it

and nice site by the way

Quote:

Originally posted by heema
I added it
and nice site by the way

Thanks. I really only created it to have a "dump" for all the little shellscripts :)