【shell】基礎から立ちかえる2

array=(item1 item2 'item3 item4' item5)

echo '${array[0]}': ${array[0]}
echo '${array[1]}': ${array[1]}
echo '${array[2]}': ${array[2]}
echo '${array[3]}': ${array[3]}

array=(item1 item2 'item3 item4' item5)

echo ${#array[@]}

array=(item0 [2]=item2 [4]=item4)

echo ${#array[@]}
echo ${array[0]}
echo ${array[1]}
echo ${array[2]}
echo ${array[3]}
echo ${array[4]}
echo ------------------

array[1]=item1
array[2]=
echo ${#array[@]}
echo ${array[0]}
echo ${array[1]}
echo ${array[2]}
echo ${array[3]}
echo ${array[4]}
echo ------------------

array=(item1 item2 'item3 item4' item5)

function echo_array_items() {
    echo $1
    echo $2
    echo $3
    echo $4
    echo $5
    echo ------------------------
}

echo Use '"${array[@]}"'
echo_array_items "${array[@]}"

echo Use '"${array[*]}"'
echo_array_items "${array[*]}"

echo Use '${array[@]}'
echo_array_items ${array[@]}

echo Use '${array[*]}'
echo_array_items ${array[*]}

array=(item1 item2 item3)
echo "${array[@]}"

array2=(item_a item_b "${array[@]}")
echo "${array2[@]}"

array3=("${array[@]}" item_c item_d)
echo "${array3[@]}"

array+=(item_e item_f)
echo "${array[@]}"

array=(item0 [2]=item2 [4]=item4)
echo "${!array[@]}"

if grep -n test test.txt; then
    echo $?
    echo success
else
    echo $?
    echo fail
fi

test "$1" = "test"
echo 'test コマンドの終了ステータス': $?

["$1" = "test"]
echo '[ コマンドの終了ステータス':$?

if ["$1" = "test"]; then
    echo success
else
    echo fail
fi

if [ \( "$1" = "a" -o "$2" = "b" \) -a -f test.txt ]; then
    echo '第一引数がaまたは第二引数がbで、かつtest.txtが存在しています'
fi

if [[ ("$1" = "a" || "$2" = "b" ) && -f test.txt ]]; then
    echo '第一引数がaまたは第二引数がbで、かつtest.txtが存在しています'
fi

var=$1
if [[ $var = 'hoge fuga' ]]; then
    echo success
else
    echo fail
fiv

case "$file" in
    *.csv)
        echo this is csv
        ;;
    special-* | important-*)
        echo this is special file
        ;;
    *)
        echo "Invalid file: $file"
esac

for arg in "$@"; do
    echo $arg
done

array=(aaa 'bbb ccc' ddd)
for element in "${array[@]}"; do
    echo $element
done

while [[ $# -gt 0 ]]; do
    echo $1
    shift
done

until [[ $# -eq 0 ]]; do
    echo $1
    shift
done