Input buffer is the lines we enter in command line

! # Clear input buffer. Use when you type erroneous code
; # Supress evaluation output. Does not print output
show-input # Show the multiline input buffer
amend-line <N> <replacement code> # N is the line numbers used as 1..10 where the code needs to be replaced. If no line number then preceding line is deleted.
amend-line <N> ! # deletes the specified lines
edit # opens a temp file to edit the input buffer
hist -n --tail 5 # display history without line numbers