Bash: Cheat sheet

bash_cheat-sheet.sh

# chmod all files in directory, including .hidden files
chmod [MODE] .[a-zA-Z0-9_]*

# create gzipped tarball, preserving permissions
tar -c -p -v -z -f /home/example/www.example.com_site-2013-04-15.tar.gz -C /home/example/ .

# Recursively chmod only directories
find . -type d -exec chmod 755 {} \;

# Similarly, recursively set the execute bit on every directory
chmod -R a+X *

# The +X flag sets the execute bit on directories only

# Recursively chmod only files
find . -type f -exec chmod 644 {} \;

# Recursively chmod only PHP files (with extension .php)
find . -type f -name '*.php' -exec chmod 644 {} \;

# Change the ownership of all files owned by one user.
# Finds all files in /home owned by UID 1056 and changes to 2056.
# See: http://www.commandlinefu.com/commands/view/892/change-the-ownership-of-all-files-owned-by-one-user.
find /home -uid 1056 -exec chown 2056 {} \;
 
# Changing files ownership in a directory recursivley from a user to another
# See: http://www.commandlinefu.com/commands/view/414/recursive-ownership-change
 
chown -cR --from=olduser:oldgroup newuser:newgroup *
 
find path/to/dir -user fred -exec chown barney '{}' \;
 
# Or, if you wish to change also the group name of the file's ownership
# to match the new user name, find the new user's group name and plug it into this:
 
find path/to/dir -user fred -exec chown barney:barneygroup '{}' \;
 
# Caveats:
# 1. Not only will this change the files under the specified directory,
# but it will change the directory itself, if the ownership matches.
# 2. Changing files owned by root can hose your system.
# See: http://www.linuxforums.org/forum/linux-programming-scripting/132312-changing-all-files-owned-root-assigned-other-user.html