Using the Korn Shell

Turn on extended command history

To start recording the date and time that each command is executed, set the EXTENDED_HISTORY environment variable to ON:


         export EXTENDED_HISTORY=ON

The CUT (Coordinated Universal Time) timestamp will be appended to each line of the ~/.sh_history file.

Display command history

The command history can be displayed with various history or fc (fix command) commands:


         history
         

         fc -l
         

         history n
         

         fc -l n
         

         

         fc -t
         

         history -t
         

         fc -t n
         

         history -t n

n specifies which command the listing is to start with. If it is negative, then the listing starts with the nth previous commmand; if it is non-negative, the listing starts with the specified command number. If -t is specified, the output will include the timestamps.

Repeat a previous command

without any parameters repeats the preceding command.


         r searchtext

repeats the last command starting with the given search text.


         r -n

repeats the nth previous command.

r n

repeats the specified command. The number of a command can be determined by displaying the command history or by setting the prompt to include the command number.

Next: Set PATH

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