1        history [n]
 2        history -c
 3        history -d offset
 4        history -anrw [filename]
 5        history -p arg [arg ...]
 6        history -s arg [arg ...]
 7               With no options, display the command history list with line numbers.  Lines listed with a * have been modified.  An argument of n lists only the last n lines.  If  the
 8               shell  variable  HISTTIMEFORMAT  is  set  and  not null, it is used as a format string for strftime(3) to display the time stamp associated with each displayed history
 9               entry.  No intervening blank is printed between the formatted time stamp and the history line.  If filename is supplied, it is used as the name of the history file; if
10               not, the value of HISTFILE is used.  Options, if supplied, have the following meanings:
11               -c     Clear the history list by deleting all the entries.
12               -d offset
13                      Delete the history entry at position offset.
14               -a     Append the ``new‘‘ history lines (history lines entered since the beginning of the current bash session) to the history file.
15               -n     Read  the  history lines not already read from the history file into the current history list.  These are lines appended to the history file since the beginning
16                      of the current bash session.
17               -r     Read the contents of the history file and use them as the current history.
18               -w     Write the current history to the history file, overwriting the history file‘s contents.
19               -p     Perform history substitution on the following args and display the result on the standard output.  Does not store the results in the  history  list.   Each  arg
20                      must be quoted to disable normal history expansion.
21               -s     Store the args in the history list as a single entry.  The last command in the history list is removed before the args are added.
22 
23               If  the  HISTTIMEFORMAT  variable is set, the time stamp information associated with each history entry is written to the history file, marked with the history comment
24               character.  When the history file is read, lines beginning with the history comment character followed immediately by a digit are interpreted  as  timestamps  for  the
25               previous  history line.  The return value is 0 unless an invalid option is encountered, an error occurs while reading or writing the history file, an invalid offset is
26               supplied as an argument to -d, or the history expansion supplied as an argument to -p fails.