wc: get a count of the total number of lines, words, characters contained in file.
Options:
-l: to count the number of lines in a file
-c: to count the number of characters in a file
-w: to count the number of words in a file
ln: create duplicate name for a given file
Usages: ln from to
Options:
-s: create a symbolic link points to original file; if the original file is removed, the symbolic link no longer works.
* if a symbolic link doesn't work, which should be removed unless you have a specific reason to keep it around.
Points:
ln files directory: you can create links to a bunch of files within a specific target directory using the format.
2. Standard Input/Output & I/O Redirection
symbol
usage
[1]>
override the destination file with standard ouputs
2>
override the destination file with error outputs
&>
override the destination file with standard & error outputs