340 Shell Scripting Fundamentals

how many I/O streams do UNIX programs have available?

three

what is 'stdin'

where input to the application is stored

what is 'stdout'

where output from the application is sent

what is 'stderr'

where error messages are sent

all three i/O streams are the users terminal (t/f)

true

only 'stdout' can be redirected to other files and devices (t/f)

false, all 3 can be redirected

at the simplest level, a shell script is a...

list of shell commands

all shell commands can be used in a script (t/f)

true

what does the file need to be set as to run?

executable

the first line in a script file is used for what purpose?

indiciate the shell to use

command to indicate to use bash shell

!/path/to/bash

what is the "#' used for?

comments

unless specififed, a shell script uses what for I/O?

stdin and stdout

what does BASH stand for?

bourne again shell

who was the BASH shell developed by?

chet ramey

the c shell is the default shell for most linux distros (t/f)

false, bash is the default shell

bash can be run on all unix implementations (t/f)

true

how is bash ported to Windows?

CYGWIN environment

BASH supports POSIX and PHP style for expression matching (t/f)

false, bash supports POSIX and PERL

a login shell for BASH parses what command(s)?

STARTUP

~/.bash_profile

~/.bash_login

~/.profile

LOGOFF

~/.bash_logout

a non-login interactive shell for BASH parses what command(s)?

STARTUP

~/.bashrc

a scripting shell BASH parses what command(s)?

none

what type of file is a shell script?

text