- Jan 11, 2008
- Discovering What Shell You're Using
- Understanding Shells and Options
- Changing Your Shell with chsh
- Changing Your Shell Temporarily
- Using Completion in the bash Shell
- Viewing Session History in the bash Shell
- Using Completion in the zsh Shell
- Viewing Session History in the zsh Shell
- Using Completion in the ksh Shell
- Viewing Session History in the ksh Shell
- Viewing Session History in the csh Shell
- Changing Your Identity with su
- Fixing Terminal Settings with stty
- Exiting the Shell
Viewing Session History in the bash Shell
Another cool feature of the bash shell is that it lets you easily reuse commands from your session history, which shows you the list of commands you've used during a session or in previous sessions (Code Listing 3.9). Viewing history is handy for reviewing your Unix session, using previous commands again (rather than retyping them), and modifying (rather than completely retyping) complex commands.
Code Listing 3.9. In this example, we typed the first command, then pressed to reuse the previous ls command. !40 recycled the 40th command from the listing.
[ejr@hobbes clean]$ ls background.htm info.htm logo.gif [ejr@hobbes clean]$ ls background.htm info.htm logo.gif [ejr@hobbes clean]$ history 1 free 2 id deb 3 id ejr 4 uname -a 5 ls ... 40 cd 41 cp .bash_history oldhistory 42 vi .bash_history 43 elm 44 ls -la 45 ls -la .e* 46 elm 47 lynx 48 history 49 vi .bash*his* 50 history 51 cd clean 52 ls 53 ls 54 history [ejr@hobbes clean]$ !40 cd [ejr@hobbes ejr]$
To view session history in the bash shell:
Use the shell for a little while, changing directories, redirecting output, or doing other tasks.
Take your time. We'll wait.
Press one time.
Note that the last (previous) command you used appears on the command line, as shown in Code Listing 3.9. To reissue the command, just press .
Continue to press or to scroll back or forward through your history. When you reach a command you want to use, press .
If you see a command that's close, but not exactly what you want to use, you can edit it. Just use the and keys to move across the line, insert text by typing it in, and use or to delete text. When you've fixed the command, press (you don't have to be at the end of the line to do so).
Type history at the shell prompt to see a numbered list of previous commands you've entered.