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- 7 Linux sudo Command Tips and Tricks
- To provide sudo access to a user, add the following line to the /etc/sudoers file.
username ALL=(ALL) ALL
- To provide sudo access to a group, add the following line to the /etc/sudoers file.
%programmers ALL=(ALL) ALL
- Remove a directory, even if files existed in that directory.
- rm -r directory
- add -f switch to prevent warning prompts.
- rm -rf dir – force remove directory dir *
- tar xzf file.tar.gz – extract a tar using Gzip
- tar xf file.tar – extract the files from file.tar
- tar xjf file.tar.bz2 – extract a tar using Bzip2
- chmod 777 – read, write, execute for all
- chmod 755 - wide open for user, read and executable for everyone else
- chmod 644 - read and writable for user, readable by everyone else
- numerical meanings
- 7 = 4+2+1 (read/write/execute)
- 6 = 4+2 (read/write)
- 5 = 4+1 (read/execute)
- 4 = 4 (read)
- 3 = 2+1 (write/execute)
- 2 = 2 (write)
- 1 = 1 (execute)chmod 755 – rwx for owner, rx for group and world
- Apply the permission to all the files under a directory recursively
- Use option -R to change the permission recursively as shown below.
- $ chmod -R 755 directory-name/
- chown -R username /dir
- Linux.org chmod
- 7 Chmod Command Examples for Beginners
- also see:
- Linux Users and Groups
- Remove old Kernels from Fedora
- rpm -q kernel
- yum remove <filename>
- yum list kernel-* will give you a list of installed and available packages.
- List disk space usage
- df -Th
- To list the drives and relevant partitions that are attached to your system, run:
- sudo fdisk -l
Change Root Password
Type sudo -i in command line terminal. Give your user account password by which you logged in to the system. Now type "passwd". It will ask you for new root password. Type new root password and then retype it. Now type exit.
Filenames with Spaces
- \ (space)