LPI Linux Certification/Create And Change Hard And Symbolic Links

Detailed Objectives (LPIC‑1 Version 5.0) Weight 2 Description Candidates should be able to create and manage hard and symbolic links to a file. Key Knowledge Areas Create links. Identify hard and/or softlinks. Copying versus linking files. Use links to support system administration tasks. The following is a partial list of the used files, terms and utilities ln ls Links Use links when: You want to create a pathname to a file. Set a shorter or fixed pathname to a file. To link one file to another, use ln: ln [options] filename linkname ln [options] filename linkdirectory Common options are: ‐f, force clobber existing link ‐s, symbolic link The default links are hard links (ln without ‑s option). A hard link can only be created to an existing file on the same physical device, after creation no visible association can be displayed between a link name and a file name.Symbolic links – also known as soft links – are like shortcuts in Windows®, in the sense that the file may be removed but the link will remain (although useless). Unlike in Windows®, however, a symbolic link can be created on a file that does not exist yet. The association between the link name and the file name can be viewed with the ls command. Linking to a file The symbolic and hard link can be displayed with ls ‑l. Symbolic link are indicated with a dash, greater than, resembling a rightward arrow (→) with most monospace fonts: link_name‑>real_filename. $ ls -l /dev/midi lrwxrwxrwx 1 root root 6 2 /dev/midi -> midi00 'shell-session' Hard links are indicated with the number of links counter (3 − 1 = 2 in this case). $ ls -l readme -rwxrwxrwx 3 yann users 677 2 readme 'shell-session' When removing a link name, use rm. Only the link will be removed not the linked file. Exercises Answer key Create directories etc and bin in your home directory. Copy all the files in recursive mode from /etc to your etc directory and do the same for /bin to bin. In your local etc directory rename all *.conf files to *.conf.bak. Create in your home directory a symbolic link called dir that points to your local bin/ls. Check if dir does execute ls. Remove the dir link. Is bin/ls still there? Linux