ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

function test_func() {
    local var1
    var1=aaa

    local var2=bbb
}

function echo_self_args()
{
    echo $1
    echo "$2"
    echo ${3}
    echo "${4}"
    echo $#
    echo "$@"
}

echo_self_args arg1 arg2 'arg3 arg4' arg5

function echo_value1()
{
    local var1=local1
    echo ${FUNCNAME[0]} ':$var1:1' $var1

    echo ${FUNCNAME[0]} ':$var2:1' $var1
}

function echo_value2()
{
    local var1=local2
    echo ${FUNCNAME[0]} ':$var1:1' $var1

    local var2=local2
    echo ${FUNCNAME[0]} ':$var2:1' $var1

    echo_value1
    echo ${FUNCNAME[0]} ':$var1:1' $var1
    echo ${FUNCNAME[0]} ':$var2:1' $var1
}

var1=global
echo 'global :$var1:1:' $var1
echo 'global :$var2:1:' $var2

echo_value2
echo 'global :$var1:2:' $var1
echo 'global :$var2:2:' $var2

function return_test()
{
    if [[ -z $1 ]]; then
        echo 'arg1 is empty.'
        return 1
    fi

    echo $1
}

return_test test
echo '終了ステータス': $?
echo ---
return_test 
echo '終了ステータス': $?

echo 'Hello' > hello.txt

ls /bin /error > bin.txt 2> error.txt

ls /bin /error &> result.txt

tr hoge fuga < hoge.txt

var1=value
text=$(cat << EOF
    arg1: $1
    var1: $var1
EOF
)
echo "$text"

echo first message1 > output.txt
echo second message1 >> output.txt
echo third message1 >> output.txt

{
    echo first message2
    echo second message2
    echo third message2
} > output.txt

{ echo first message3;echo second message3;echo third message3; } > output.txt

cd /bin
pwd
var1=value1
echo $var1

(
    cd /home/vagrant
    pwd
    echo $var1
    var1=value2
    echo $var1
)

pwd
echo $var1

set -e

ls /error
mkdir /error/dir1

set -u

rm -rf $work_dir/

set -C

touch test1.txt
echo "aaa" >| test1.txt
echo "bbb" >> test1.txt

touch test2.txt
echo "ccc" > test2.txt

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