ubuntu code snippets

set default browser

xdg-settings set default-web-browser firefox.desktop

Changing User Password in Ubuntu Terminal

sudo passwd <username>      *username will not go into < >'s*
[sudo] password for <username>: 
New password: 
Retype new password: 
passwd: password updated successfully

Copy all folder content to another folder In Ubuntu

cp -a /path/to/source_dir/. /path/to/dest_dir/

Get total size of a directory or folder in Ubuntu

# If you are in same directory
------------------------------
du -hs

# If you are in different location
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du -hs /path/to/directory

# If you want to list the size seperatyly for each sub directory
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du -h | sort -h

Delete all empty directories in a directory in Ubuntu

# Go to directory and execute command
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find . -empty -type d -delete

Find all empty directories in a directory in Ubuntu

# Go to DIR and execute below command
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find . -empty
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>> It will list all the empty directories in the terminal

Extract, decompress or unzip a zip file in Ubuntu

# If unzip command not found
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sudo apt-get install unzip

# To unzip the zip file on the same location
--------------------------------------------
unzip FILE_NAME.zip
>> It means the source and destination folders are same

# To unzip a zip file to a target location
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unzip file.zip -d /path/to/destination_folder

Copy a directory along with its content to another directory in Ubuntu

# If directory does not exist in the target location
------------------------------------------------------
cp -r /path/to/directory /path/to/folder

# Copy a directory with a new directory name
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cp -r /path/to/directory /path/to/folder/NEW_DIR_NAME

Remove or Delete a folder or directory in Ubuntu

# Delete a directory
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rm -rf DIRECTORY_NAME

# If show - Permission error
------------------------------------------------
sudo rm -rf FOLDER_NAME

# If not on the same level of the folder
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sudo rm -r /path/to/FOLDER_NAME

Change directory name or rename a directory in Ubuntu

# Rename directory on current path
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mv old_dir_name new_dir_name

# Rename directory using directory path
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mv /var/etc/old_dir_name /var/etc/new_dir_name

# Second method - gvfs-move command
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gvfs-move /home/user/old_dir_name /home/user/new_dir_name

Create a new directory or folder in Ubuntu

# create new directory(in current folder)
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mkdir directory_name
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# To verify it---
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ls -l
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# create directory on a path(another location)
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mkdir /path/to/folder/directory_name
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# create directory along with it parent directory
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mkdir -p /home/new_parent_direcory/directory_name
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>> If we use -p with mkdir it will create the parent direcotry also if it does not exist