As root user you have set the environment variable HISTIGNORE=”ls:man:pwd:cat” with the other
history-related shell variables at their default. What impact does it have on shell history?
A.
History will ignore only the commands listed in the HISTIGNORE variable.
B.
History will save only the first occurrence of the commands listed in the HISTIGNORE variable.
C.
History will ignore only the commands, issued with any valid switch, listed in the HISTIGNORE
variable.
D.
History will save only the first occurrence of the commands, issued with any valid switch, listed
in the HISTIGNORE variable.
Explanation: