Text-only	Table of Contents (frame/ no frame)
(6) Shells cont.

How shells help

History - shell keeps track of commands and allows commands to be executed again, recalled
- View command history, history
- Setting history to remember, set history=100, set savehist=50; will save history in a file (".history") when you log out
- csh & tcsh !!; recalls last command, !10; re-run command 10
  !pico; re-run last command starting with "pico"
- Edit command line csh - (!), (^); tcsh arrow keys and emacs key strokes
Name completion Shells also help you complete words; file names and commands
- csh - (files & directories); <esc>
- tcsh - (files, directories, commands, variables) <tab>
- To turn on these features: set autolist, set nobeep
List possible names <^D>
Spelling correction, set autocorrect, set correct=all
Changing the prompt, set prompt="%m:%c:%h"
Aliases - create a shortcut name for a command, very helpful construct
- Create an alias to save typing, e.g. "alias his history" creates an short name for the history command
- Use to supply options every time, e.g. "alias ls ls -FC"
- To remove an alias "unalias alias_name"
Substuting arbitrary shell or environment variables - $var
Command substitution - `command`, e.g. "echo `date`"
(Note that this character is the backtic - sometimes hard to find or generate on old Mac keyboards)

slide06.src last modified Feb 8, 2011

Table of Contents
(frame/no frame)