Linux in a Nutshell, Fifth Edition

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Chapter 6: The Bash Shell and Korn Shell

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

with command numbers. With a count argument, print only that

many of the most recent commands.

Options

-a Append new history lines (those executed since the beginning

of the session) to the history file.

-c Clear the history list (remove all entries).

-d position

Delete the history item at position position.

-n Read unread history lines from the history file into the history

list.

-p argument ...

Perform csh-style history expansion on each argument,

printing the results to standard output. The results are not

saved in the history list.

-r Read the history file and replace the history list with its

contents.

-s argument ...

Store the arguments in the history list, as a single entry.

-w Write the current history list to the history file, overwriting it

entirely.

history

history

ksh88 alias for fc -l. ksh93 alias for hist -l. Show the last 16

commands.

if

if condition1

then commands1

[ elif condition2

then commands2 ]

.

.

.

[ else commands3 ]

fi

If condition1 is met, do commands1; otherwise, if condition2 is met,

do commands2; if neither is met, do commands3. Conditions are

often specified with the test and [[ ]] commands. See test and [[ ]]

for a full list of conditions, and see additional Examples under :

and exit.

Examples

Insert a 0 before numbers less than 10: ...