array-at-star

来自「android-w.song.android.widget」· 代码 · 共 121 行

# test the expansion of ${array[@]} and ${array[*]}, both quoted and
# unquoted.  the expansions should be exactly analogous to the
# expansions of $@ and $* quoted and unquoted
A=(a b)

recho "${A[*]}"

# If IFS is null, the parameters are joined without separators
IFS=''
recho "${A[*]}"

# If IFS is unset, the parameters are separated by spaces
unset IFS
recho "${A[*]}"

recho "${A[@]}"
recho ${A[@]}

IFS='/'
A=(bob 'tom dick harry' joe)
set ${A[*]}
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[*]}
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[@]}
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[@]}
recho $#
recho $1
recho $2
recho $3

# according to POSIX.2, unquoted $* should expand to multiple words if
# $IFS is null, just like unquoted $@
IFS=''
A=(bob 'tom dick harry' joe)
set "${A[*]}"
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[*]}
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[@]}
recho $#
recho $1
recho $2
recho $3

# if IFS is unset, the individual positional parameters are split on
# " \t\n" if $* or $@ are unquoted
unset IFS
A=(bob 'tom dick harry' joe)
set ${A[*]}
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set ${A[@]}
recho $#                                              
recho $1
recho $2
recho $3

# but not for "$@" or "$*"
A=(bob 'tom dick harry' joe)
set "${A[*]}"
recho $#
recho $1
recho $2
recho $3

A=(bob 'tom dick harry' joe)
set "${A[@]}"
recho $#
recho $1
recho $2
recho $3

# these should both expand the value of A to multiple words
A=(a b c d e)
IFS=""
recho ${A[@]}
recho "${A[@]}"

# this example is straight from the POSIX.2 rationale and adapted to arrays
A=(foo bar bam)

recho "${A[@]}"
recho "${A[*]}"

unset IFS

recho "${A[@]}"
recho ${A[@]}
recho "${A[*]}"