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.

break ;;

*) echo "$line" >> $message ;;

esac

done

caller

caller [expression]

Bash only. Print the line number and source file name of the

current function call or dot file. With nonzero expression, prints

that element from the call stack. The most recent is zero. This

command is for use by the Bash debugger.

cd

cd [-LP] [dir]

cd [-LP] [-]

cd [-LP] [old new]

With no arguments, change to home directory of user. Otherwise,

change working directory to dir.Ifdir is a relative pathname but is

not in the current directory, the CDPATH variable is searched. A

directory of - stands for the previous directory. The last syntax is

specific to the Korn shell. It modifies the current directory name by

replacing string old with new and then switches to the resulting

directory.

Options

-L Use the logical path (what the user typed, including any

symbolic links) for cd .. and the value of PWD. This is the

default.

-P Use the actual filesystem physical path for cd .. and the value

of PWD.

Example

$ pwd

/var/spool/cron

$ cd cron uucp Ksh: cd prints the new directory

/var/spool/uucp

command

command [-pvV] name [arg ...]

Not ksh88. Without -v or -V, execute name with given arguments.

This command bypasses any aliases or functions that may be

defined for name. When used with a special ...