Shell script recipes

How to execute a command in all the sub directories in linux?

Consider there is a need to execute a command in all the sub directories of a directory, how to do it using bash script?

# In this example `du -ksh` is executed to get the size of each sub directory 
##Get disk usage of all sub directories#########################
function duall(){
    for d in */; do
        if [ -d "$d" ]; then
            echo "$d"
            cd "$d"
            du -ksh # Replace this line with any command required
            cd ..
        fi
    done
}

Add the function to the .bashrc file in the home directory and below the function add an alias for the function:

alias duall="duall" # Disk usage of all sub directories

Now the function duall available as a command.

How to remove all the files of a given type recursively?

find . -name "*.bak" -type f -delete

Warning: If the -delete is issued before -name option, find will delete all the file.

How to tar all the folders and file except few?

tar --exclude='./folder' --exclude='./upload/folder2' -zcvf /backup/filename.tgz .

Reference

How to retain the folder structure while archiving using 7z?

It helps to create a archive file with full path later to exactly recreate the same folder structure while extracting the zip file.

7z a -spf some.zip ./folder/subfolder/*

While extracting the some.zip file all the folder structure will be retained.

7z x some.zip