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.

-. End processing of options by specifying -- on the command line.

string contains the option letters to be recognized by getopts when

running the shell script. Valid options are processed in turn and

stored in the shell variable name. If an option is followed by a

colon, the option must be followed by one or more arguments.

(Multiple arguments must be given to the command as one shell

word. This is done by quoting the arguments or separating them

with commas. The application must be written to expect multiple

arguments in this format.) getopts uses the shell variables

OPTARG and OPTIND. The Bash version also uses OPTERR.

Option

-a Use name in error messages about invalid options. ksh93 only.

hash

hash [-dlrt] [-p file] [commands]

Bash version. As the shell finds commands along the search path

($PATH), it remembers the found location in an internal hash

table. The next time you enter a command, the shell uses the value

stored in its hash table.

With no arguments, hash lists the current hashed commands. The

display shows hits (the number of times the command is called by

the shell) and the command name.

With commands, the shell adds those commands to the hash table.

Options

-d Remove (delete) just the specified commands from the hash

table.

-l Produce ...