set

Question 1

set

Answer 1

Set or unset values of shell options and positional parameters.

Question 2

set

• a
• b
• e
• f
• h

Answer 2

• a, Mark variables which are modified or created for export.
• b, Notify of job termination immediatedly.
• e, Exit immediately if a command exits with a non-zero status.
• f, Disable file name generation (globbing).
• h, Remember the location of commands as they are looked up.

Question 3

set

• k
• m
• n
• o

Answer 3

• k, All assignment arguments are placed in the environment for a command, not just those that precede the command name.
• m, Job control is enabled.
• n, Read commands but do not execute them.
• o, Option-name. Set a variable corresponding to an option-name.

Question 4

set -o option-name

allexport or -a

braceexpand or -B

emacs, use an emacs-style line editing interface

errexit or -e

errtrace or -E

functrace or -T

Answer 4

set -o option-name

hashall or -h

histexpand or -H

history, Enable command history

ignoreeof, The shell will not exit upon reading EOF

interactive-comments, allow comments to appear in interactive commands

keyword -k

Question 5

set -o option-name

monitor or -m

noclobber or -C

noexec or -n

noglob or -f

nolog, Currently accepted but ignored

notify or -b

Answer 5

set -o option-name

nounset or -u

onecmd or -t

physical or -P

pipefail, The return value of a pipeline is the status of the last command to exit with a non-zero status.

posix, Change the behavior of bash where the default operation differs from the Posix standard to match the standard.

Question 6

set -o option-name

privilledged or -p

verbose or -v

Answer 6

set -o option-name

vi, use a vi-style line editing interface

xtrace or -x

Question 7

set

• p
• t
• u

Answer 7

• p, Turned on whenever the real and effective user ids do not match. Disables processing of the $ENV file and importing of shell functions. Turning this option off causes the effective uid and gid to be set to the real uid and gid.
• t, Exit after reading and executing one command.
• u, Treat unset variables as an error when substituting.

Question 8

set

• v
• x
• B
• C

Answer 8

• v, Print shell input lines as they read.
• x, Print commands and their arguments as they are executed.
• B, The shell will perform brace expansion.
• C, If set, disallow existing regular files to be overwritten by redirection of output.

Question 9

set

• E
• H
• P
• T

Answer 9

• E, If set, the ERR trap is inherited by shell functions.
• H, Enable ! style history substitution. This flag is on by default when the shell is interactive.
• P, If set, do not resolve symbolic links when executing commands such as cd which change the current directory.
• T, If set, the DEBUG and RETURN traps are inherited by shell functions.