How do I extract certain columns from a text file in Unix?

Somehow I can never remember the cut command in Unix. But I occasionally want to remove certain columns from a text file of data. cut will do that. 
 Delimited 
 Here is a simple tab-delimited example. (Use the -d option to set a different column delimiter.) 
 Data File (tab-delimited) 
 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 
 Command 
 cut -f1,4,6 filename 
 Output 
 111 444 666 111 444 666 111 444 666 111 444 666 111 444 666 
 There are two other examples in the Search and Replace section of this KB article. https://kb.ucla.edu/link/117 
 More options are available in the Unix man pages for cut. Type man cut 
 Fixed Width 
 Use the -c option to select characters based on position. 
 Data File (fixed width) 
 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 111 222 3333 444 555 666 
 Command 
 cut -c9,16 filename 
 Output 
 222 222 222 222 222