{"id":410,"date":"2026-02-10T03:54:03","date_gmt":"2026-02-10T03:54:03","guid":{"rendered":"https:\/\/mitalgoswami.in\/?p=410"},"modified":"2026-02-17T04:37:40","modified_gmt":"2026-02-17T04:37:40","slug":"array","status":"publish","type":"post","link":"https:\/\/mitalgoswami.in\/?p=410","title":{"rendered":"Array"},"content":{"rendered":"\n

📦 What is an array?<\/h2>\n\n\n\n

An array<\/strong> is a variable that can store multiple values<\/strong> under one name.<\/p>\n\n\n\n

\n

⚠️ Arrays are supported in Bash<\/strong>, not in very old sh<\/code>.<\/p>\n<\/blockquote>\n\n\n\n

\n\n\n\n

🔹 Declare an array<\/h2>\n\n\n\n
arr=(10 20 30 40)\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 1: Print all array elements<\/h2>\n\n\n\n
#!\/bin\/bash\n\narr=(10 20 30 40)\n\necho ${arr[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 2: Access single element<\/h2>\n\n\n\n
arr=(Apple Banana Mango)\n\necho ${arr[1]}\n<\/code><\/pre>\n\n\n\n
📌 Output:<\/p>\n\n\n\n
Banana\n<\/code><\/pre>\n\n\n\n
(index starts from 0<\/strong>)<\/p>\n\n\n\n
\n\n\n\n
✅ Example 3: Find array length<\/h2>\n\n\n\n
arr=(10 20 30 40)\n\necho ${#arr[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 4: Loop through array<\/h2>\n\n\n\n
#!\/bin\/bash\n\ncolors=(Red Green Blue)\n\nfor c in ${colors[@]}\ndo\n    echo $c\ndone\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 5: Add new element to array<\/h2>\n\n\n\n
arr=(1 2 3)\narr+=(4)\n\necho ${arr[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 6: Read array from user<\/h2>\n\n\n\n
read -a nums\necho ${nums[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 7: Array with string and numbers<\/h2>\n\n\n\n
data=(\"Linux\" 10 \"Unix\" 20)\n\necho ${data[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 8: Using index explicitly<\/h2>\n\n\n\n
arr[0]=100\narr[1]=200\n\necho ${arr[1]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 9: Delete array element<\/h2>\n\n\n\n
arr=(10 20 30)\nunset arr[1]\n\necho ${arr[@]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
✅ Example 10: One-line array example (EXAM GOLD ⭐)<\/h2>\n\n\n\n
arr=(A B C); echo ${arr[2]}\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
📝 Exam tips (important ⚠️)<\/h2>\n\n\n\n
    \n
  • Index starts from 0<\/strong><\/li>\n\n\n\n
  • ${arr[@]}<\/code> \u2192 all elements<\/li>\n\n\n\n
  • ${#arr[@]}<\/code> \u2192 array size<\/li>\n\n\n\n
  • Arrays work in bash<\/strong>, not pure sh<\/strong><\/li>\n<\/ul>\n\n\n\n
    !\/bin\/bash<\/h1>\n\n\n\n
    arr=(5 2 8 1 3)
    n=${#arr[@]}<\/p>\n\n\n\n
    for ((i=0; i<n; i++))
    do
    for ((j=i+1; j<n; j++))
    do
    if [ ${arr[i]} -gt ${arr[j]} ]; then
    temp=${arr[i]}
    arr[i]=${arr[j]}
    arr[j]=$temp
    fi
    done
    done<\/p>\n\n\n\n
    echo “Sorted array:”
    echo ${arr[@]}<\/p>\n\n\n\n
    Bubble sort Example<\/strong><\/p>\n\n\n\n
    !\/bin\/bash<\/h1>\n\n\n\n
    arr=(5 1 4 2 8)
    n=${#arr[@]}<\/p>\n\n\n\n
    for ((i=0; i<n; i++))
    do
    for ((j=0; j<n-i-1; j++))
    do
    if [ ${arr[j]} -gt ${arr[j+1]} ]; then
    temp=${arr[j]}
    arr[j]=${arr[j+1]}
    arr[j+1]=$temp
    fi
    done
    done<\/p>\n\n\n\n
    echo “Sorted array:”
    echo “${arr[@]}”<\/p>\n\n\n\n
    <\/p>\n","protected":false},"excerpt":{"rendered":"
    📦 What is an array? An array is a variable that can store multiple values under one name. ⚠️ Arrays are supported in Bash, not in very old sh. 🔹 Declare an array ✅ Example 1: Print all array elements ✅ Example 2: Access single element 📌 Output: (index starts from 0) ✅ Example 3: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-410","post","type-post","status-publish","format-standard","hentry","category-unix"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/posts\/410","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=410"}],"version-history":[{"count":2,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/posts\/410\/revisions"}],"predecessor-version":[{"id":414,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=\/wp\/v2\/posts\/410\/revisions\/414"}],"wp:attachment":[{"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mitalgoswami.in\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}