Final answer:
The 'cut' command is used to extract a column from a text file in Unix-like systems, specifying the delimiter and field number.
Step-by-step explanation:
The command used to extract a column from a text file in a Unix-like operating system is cut. This command allows you to cut out sections from each line of files and output the result. For example, if you want to extract the second column from a file where columns are separated by commas, you can use the command cut -d ',' -f2 filename.txt, where -d specifies the delimiter and -f2 specifies the second field or column.