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.

nocaseglob

Ignore letter case when doing filename matching.

nullglob

Expand patterns that do not match any files to the null string,

instead of using the literal pattern as an argument.

progcomp †

Enable programmable completion.

promptvars †

Perform variable, command, and arithmetic substitution on

the values of PS1, PS2 and PS4.

restricted_shell

Set by the shell when it is a restricted shell. This is a read-only

option.

shift_verbose

Causes shift to print an error message when the shift count is

greater than the number of positional parameters.

sourcepath †

Causes the

. (dot) and source commands to search $PATH in

order to find the file to read and execute.

xpg_echo

Causes echo to expand escape sequences, even without the -e

or -E options.

shift

shift [n]

Shift positional arguments (e.g., $2 becomes $1). If n is given, shift

to the left n places. Used in while loops to iterate through

command-line arguments. In the Korn shell, n can be an integer

expression.

Examples

shift $1+$6 Korn shell: use expression result as shift count

shift $(($1 + $6)) Same, portable to any POSIX shell

sleep

sleep [n]

ksh93 only. Sleep for n seconds. n can have a fractional part.

source

source file [arguments]

Bash only. Identical to the . (dot) command; see that entry.

stop

stop [jobIDs ...