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bash bash bash Pocket Reference

Editor:

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Proofreader:

Indexer:

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Interior Designer:

Printing History:

Contents

The Bash Shell 1

Conventions2

History2

Overview of Features3

Invoking the Shell4

Syntax

6

Functions18

Variables20

Arithmetic Expressions36

Command History37

Programmable Completion41

Job Control46

Shell Options47

Command Execution52

Coprocesses53

Restricted Shells54

Built-in Commands55

Resources109

Acknowledgments110

Index 111v

The Bash Shell

1

Conventions

constantwidth constantwidthuserinput constantwidthreplaceable man

History

/bin/sh

CDPATH

test csh csh

2 | The Bash Shell

Overview of Features

vi for

Overview of Features | 3

Invoking the Shell

bash bash [ options arguments -s -i /bin/sh sh /etc/profile~/.profile $ENV

Options

-c str -D --dump-strings -i -l --login -O option shopt +O -p $ENV $BASH_ENV

BASHOPTSCDPATH

GLOBIGNORE

SHELLOPTS

$HOME/.bash_profile

4 | The Bash Shell

-r--restricted -s --debugger extdebug shopt --dump-po-strings -D gettext --help --init-file file --rcfile file ~/.bashrc --noediting --noprofile /etc/profile --norc ~/.bashrc sh --posix --verbose set -v --version

Invoking the Shell | 5

set

Arguments

$1 $2 $1$2 $0

Syntax

Special Files

/etc/profile ~/.bash_profile ~/.bash_login ~/.profile ~/.bashrc sh $ENV

6 | The Bash Shell

getpwnam()getpwuid() /etc/passwd

Filename Metacharacters

abc a-z A-Z 09 abc name ~+$PWD ~-$OLDPWD extglob pattern pattern pattern pattern pattern egrep awk globstar

Syntax | 7

[[=c=]] [[.c.]] class

Class Characters matchedClass Characters matched

alnum print alphapunct blankspace cntrlupper digitword [[:word:]] [[:alnum:]_] graphxdigit lower

Examples

ls new*quotesdbs_dbs7.pdfusesText_5