gzipping up a set of directories and creating a tar compressed file

Question

My bash fu is not what it should be.

I want to create a little batch script which will copy a list of directories into a new zip file.

There are (at least) two ways I can think of proving the list of files:

1. read from a file (say config.txt). The file will contain the list of directories to zip up OR

2. hard code the list directly into the bash script

The first option seems more straightforward (though less elegant).

The two problems I am facing are that I am not sure how to do the following:

• provide the list of directories to the shell script
• iterate over the list of directories

Could someone suggest in a few lines, how I can do this?

BTW, I am running on Ubuntu 10.0.4

Answer 1

You can create a gzipped tar on the commandline as follows:

tar czvf mytar.tar.gz dir1 dir2 .. dirN

If you wanted to do that in a bash script and pass the directories as arguments to the script, those arguments would end up in $@. So then you have:

tar czvf mytar.tar.gz "$@"

If that is in a script (lets say myscript.sh), you would call that as:

./myscript.sh dir1 dir2 .. dirN

If you want to read from a list (your option 1) you could do that like so (this does not work if there is whitespace in directory names):

tar czvf mytar.tar.gz $(<config.txt)

Answer 2

create two files: filelist - place all required directories ( one on single line )

and create a simple bash script:

    #!/bin/bash


for DIR in `cat filelist` 
do 
    if [ -d $DIR ] 
    then
        echo $DIR
    fi
done

Answer 3

You can export a variable like DIRECTORIES="DIR1 DIR2 DIR3 ...." And in the script you need to use the variable like tar czvf $DIRECTORIES

Answer 4

Just use the null-byte as delimiter when you write file / directory names to file. This way you need not worry about spaces, newlines, etc. in file names!

printf "%s\000" */ > listOfDirs.txt    # alternative: find ... -print0 

while IFS="" read -r -d '' dir; do command ls -1abd "$dir"; done < listOfDirs.txt

tar --null -czvf mytar.tar.gz --files-from listOfDirs.txt