30.11. Check Your History First with :pHere's how to be more sure of your history before you use it. First, remember that the history substitutions !/ and !fra are replaced with the most recent command lines that started with / and fra, respectively. If your memory is like mine (not very good), you might not be sure that !/ will bring back the command you want. You can test it by adding :p to the end. The shell will print the substitution but won't execute the command line. If you like what you got, type !! to execute it. For example: # !/:p /usr/sbin/sendmail -qv # !! /usr/sbin/sendmail -qv Running id12345... At the first prompt, the :p meant the command line was only printed. At the second prompt, I didn't use :p and the sendmail command was executed. The :p works with all history operators -- for instance, !?sendmail?:p. -- JP Copyright © 2003 O'Reilly & Associates. All rights reserved. |
|