Linux in a Nutshell, Fifth Edition

shopt | 683

Bash and Korn

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

Examples

set -- "$num" -20 -30 Set $1 to $num, $2 to -20, $3 to -30

set -vx Read each command line; show it;

execute it; show it again (with arguments)

set +x Stop command tracing

set -o noclobber Prevent file overwriting

set +o noclobber Allow file overwriting again

shopt

shopt [-opqsu] [option]

Bash only. Sets or unsets shell options. With no options or just -p,

prints the names and settings of the options.

Options

-o Each option must be one of the shell option names for set -o,

instead of the options listed in the next section.

-p Print the option settings as shopt commands that can be

reread later.

-q Quiet mode. The exit status is zero if the given option is set,

nonzero otherwise. With multiple options, all of them must be

set for a zero exit status.

-s Set the given options. With no options, prints only those that

are set.

-u Unset the given options. With no options, prints only those

that are unset.

-o physical -P •

-o pipefail ••

-o posix •

-o privileged -p •••

-o trackall -h ••

-o verbose -v •••

-o vi •••

-o viraw ••

-o xtrace -x •••

-p -o privileged •••

-P -o physical •

-s ••

-t -o onecmd •••

-T -o functrace •

-u -o nonunset •••

-v -o verbose •••

-x -o xtrace •••

Option Same as ksh88 ksh93 Bash

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Chapter 6: The Bash Shell and Korn Shell

This is the Title of the Book, eMatter ...