{"id":2390,"date":"2025-11-03T15:43:13","date_gmt":"2025-11-03T15:43:13","guid":{"rendered":"https:\/\/www.ucartz.com\/blog\/?p=2390"},"modified":"2025-11-03T15:49:55","modified_gmt":"2025-11-03T15:49:55","slug":"understanding-bash-ifelse-statements","status":"publish","type":"post","link":"https:\/\/www.ucartz.com\/blog\/understanding-bash-ifelse-statements\/","title":{"rendered":"Understanding Bash If\u2026Else Statements"},"content":{"rendered":"\n

Conditional statements are a core concept in any programming language, and Bash is no exception. In shell scripting, decision-making lets you control the flow of execution based on whether a condition is true or false. Bash provides several options for this: if<\/strong>, if\u2026else<\/strong>, if\u2026elif\u2026else<\/strong>, and nested if<\/strong> statements.<\/p>\n\n\n\n

In this guide, we\u2019ll walk through the basics of the Bash if\u2026else statement<\/strong>, explain how it works, and demonstrate its usage with practical examples.<\/p>\n\n\n\n

The Basic If Statement<\/strong><\/h4>\n\n\n\n

There are different forms of Bash if conditional statements. The simplest form of conditional execution in Bash looks like this:<\/p>\n\n\n\n

if TEST-COMMAND
then
\u00a0\u00a0STATEMENTS
fi<\/code><\/p>\n\n\n\n

The if statement in Bash begins with the if<\/strong> keyword, followed by a conditional expression<\/strong>, and then the then<\/strong> keyword. The statement is closed using the fi<\/strong> keyword (which is simply \u201cif\u201d<\/em> spelled backward).<\/p>\n\n\n\n

if [ TEST-COMMAND ]; then
\u00a0\u00a0\u00a0\u00a0STATEMENTS
fi<\/code><\/p>\n\n\n\n

If the TEST-COMMAND<\/strong> evaluates to True<\/strong>, the STATEMENTS<\/strong> inside the block are executed. If the TEST-COMMAND<\/strong> returns False<\/strong>, nothing happens \u2014 the commands inside the block are skipped.

Example: Check if a Number is Greater than 10<\/strong><\/p>\n\n\n\n

#!\/bin\/bash
echo -n \"Enter a number: \"
read VAR
if [[ $VAR -gt 10 ]]
then
\u00a0\u00a0echo \"The variable is greater than 10.\"
fi<\/code><\/p>\n\n\n\n

You need to save the code in a file and have to run it from the command line. For example, if you save the code in a file as: bash samplecode.sh and when executed, the script will ask to enter a number. You need to enter 15, the output will be:<\/p>\n\n\n\n

The variable is greater than 10.<\/p>\n\n\n\n

If\u2026Else Statement<\/strong><\/h4>\n\n\n\n

The following is the form of the Bash if…else statement:<\/p>\n\n\n\n

if TEST-COMMAND
then
\u00a0\u00a0STATEMENTS1
else
\u00a0STATEMENTS2
fi<\/code><\/p>\n\n\n\n

If the TEST-COMMAND evaluates to True, the STATEMENTS1 will be executed. Otherwise, if TEST-COMMAND returns False, the STATEMENTS2 will be executed. You can have only one else clause in the statement.<\/p>\n\n\n\n

Example:<\/strong><\/h5>\n\n\n\n

#!\/bin\/bash
echo -n \"Enter a number: \"
read VAR
if [[ $VAR -gt 10 ]]
then
\u00a0\u00a0echo \"The variable is greater than 10.\"
else
\u00a0\u00a0echo \"The variable is equal to or less than 10.\"
fi<\/code><\/p>\n\n\n\n

When you run the code above, it prompts you to enter a number. Now, the script will display an output based on whether the number is greater than, less than, or equal to 10.<\/p>\n\n\n\n

If\u2026Elif\u2026Else Statement<\/strong><\/h4>\n\n\n\n

When you need to check multiple conditions, you can use elif. The following is the form of the Bash if…elif…else statement:<\/p>\n\n\n\n

if TEST-COMMAND1
then
\u00a0\u00a0STATEMENTS1
elif TEST-COMMAND2
then
\u00a0\u00a0STATEMENTS2
else
\u00a0\u00a0STATEMENTS3
fi<\/code><\/p>\n\n\n\n

If TEST-COMMAND1<\/strong> evaluates to True<\/strong>, the STATEMENTS1<\/strong> block is executed. (OR)
If TEST-COMMAND2<\/strong> evaluates to True<\/strong>, then STATEMENTS2<\/strong> will be executed instead.
If none of the test commands evaluate to True<\/strong>, the STATEMENTS3<\/strong> block (inside the else clause) will run.<\/p>\n\n\n\n

You can include one or more elif<\/strong> clauses between the if and else sections, depending on how many conditions you want to check. The else<\/strong> clause itself is optional.<\/p>\n\n\n\n

Each condition is evaluated in order<\/strong>, from top to bottom. As soon as one condition evaluates to True<\/strong>, the remaining conditions are skipped, and the script continues executing after the entire if block.

Example:<\/strong><\/p>\n\n\n\n

#!\/bin\/bash
echo -n \"Enter a number: \"
read VAR
if [[ $VAR -gt 10 ]]
then
\u00a0\u00a0echo \"The variable is greater than 10.\"
elif [[ $VAR -eq 10 ]]
then
\u00a0\u00a0echo \"The variable is equal to 10.\"
else
\u00a0\u00a0echo \"The variable is less than 10.\"
fi<\/code><\/p>\n\n\n\n

Nested If Statements<\/strong><\/h4>\n\n\n\n

Bash also allows you to place if statements inside other if statements. While powerful, they can quickly become messy, so use them carefully.

Below is a script that will ask you to enter three numbers and, based on the input it print the largest number among those three numbers.<\/p>\n\n\n\n

Example: Find the Largest of Three Numbers<\/strong><\/h4>\n\n\n\n

#!\/bin\/bash
echo -n \"Enter the first number: \"
read VAR1
echo -n \"Enter the second number: \"
read VAR2
echo -n \"Enter the third number: \"
read VAR3
if [[ $VAR1 -ge $VAR2 ]]
then
\u00a0\u00a0if [[ $VAR1 -ge $VAR3 ]]
\u00a0\u00a0then
\u00a0\u00a0\u00a0\u00a0echo \"$VAR1 is the largest number.\"
\u00a0\u00a0else
\u00a0\u00a0\u00a0\u00a0echo \"$VAR3 is the largest number.\"
\u00a0\u00a0fi
else
\u00a0\u00a0if [[ $VAR2 -ge $VAR3 ]]
\u00a0\u00a0then
\u00a0\u00a0\u00a0\u00a0echo \"$VAR2 is the largest number.\"
\u00a0\u00a0else
\u00a0\u00a0\u00a0\u00a0echo \"$VAR3 is the largest number.\"
\u00a0\u00a0fi
fi<\/code><\/p>\n\n\n\n

Sample Output:<\/strong>
Once the above code is executed, the output will look like:<\/p>\n\n\n\n

Enter the first number: 8
Enter the second number: 4
Enter the third number: 1

8 is the largest number.<\/strong><\/p>\n\n\n\n

Tip:<\/strong> For complex conditions, consider using the case statement instead\u2014it is recommended.<\/p>\n\n\n\n

Using Multiple Conditions<\/strong><\/h4>\n\n\n\n

The logical OR <\/strong>and logical AND<\/strong> operators enable you to combine multiple conditions within an if statement.<\/p>\n\n\n\n

You can combine conditions using logical operators<\/strong>:<\/p>\n\n\n\n

    \n
  • && (AND):<\/strong> all conditions must be true.<\/li>\n\n\n\n
  • || (OR):<\/strong> at least one condition must be true.<\/li>\n<\/ul>\n\n\n\n

    Here\u2019s an updated version of the script that determines the largest number among three values. In this approach, instead of using nested if statements, we utilize the logical AND (&&)<\/strong> operator to make the code more concise and easier to read.<\/p>\n\n\n\n

    Example with AND Operator:<\/strong><\/h4>\n\n\n\n

    #!\/bin\/bash
    echo -n \"Enter the first number: \"
    read VAR1
    echo -n \"Enter the second number: \"
    read VAR2
    echo -n \"Enter the third number: \"
    read VAR3
    if [[ $VAR1 -ge $VAR2 ]] && [[ $VAR1 -ge $VAR3 ]]
    then
    \u00a0\u00a0echo \"$VAR1 is the largest number.\"
    elif [[ $VAR2 -ge $VAR1 ]] && [[ $VAR2 -ge $VAR3 ]]
    then
    \u00a0\u00a0echo \"$VAR2 is the largest number.\"
    else
    \u00a0\u00a0echo \"$VAR3 is the largest number.\"
    fi<\/code><\/p>\n\n\n\n

    Sample Output:<\/strong>
    Once the above code is executed, the output will look like:<\/p>\n\n\n\n

    Enter the first number: 8
    Enter the second number: 4
    Enter the third number: 1

    8 is the largest number.<\/strong><\/p>\n\n\n\n

    Test Operators in Bash<\/strong><\/h4>\n\n\n\n

    In Bash, the test command can be written in any of the following forms:<\/p>\n\n\n\n

    test EXPRESSION
    [ EXPRESSION ]
    [[ EXPRESSION ]]<\/code><\/strong><\/p>\n\n\n\n

    To ensure your script is portable, it\u2019s best to use the traditional test or [ … ] syntax<\/strong>, as these are supported by all POSIX-compliant<\/strong> shells.<\/p>\n\n\n\n

    The newer [[ … ]]<\/strong> syntax is an enhanced version of test, offering additional features and improved syntax handling. It is supported by most modern shells such as Bash, Zsh, and Ksh.<\/p>\n\n\n\n

    To negate a test expression, use the logical NOT (!)<\/strong> operator. When comparing strings, always enclose them in single or double quotes<\/strong> to prevent issues with word splitting or globbing.<\/p>\n\n\n\n

    The test command (or its shorthand [ ] <\/strong>and [[ ]]<\/strong>) evaluates conditions. Here are some common operators:<\/p>\n\n\n\n

    String Operators<\/strong><\/h4>\n\n\n\n
      \n
    • -n VAR<\/strong> \u2192 Returns true<\/strong> if the variable VAR<\/strong> is not empty<\/strong><\/li>\n\n\n\n
    • -z VAR<\/strong> <\/strong>\u2192 Returns true<\/strong> if the variable VAR<\/strong> is empty<\/strong><\/li>\n\n\n\n
    • STRING1 = STRING2<\/strong> \u2192 Returns true<\/strong> if both strings are equal<\/strong><\/li>\n\n\n\n
    • STRING1 != STRING2<\/strong> \u2192 Returns true<\/strong> if the strings are different<\/strong><\/li>\n<\/ul>\n\n\n\n

      Integer Operators<\/strong><\/h4>\n\n\n\n
        \n
      • -eq <\/strong>\u2192 Equal to<\/li>\n\n\n\n
      • -ne <\/strong>\u2192 Not equal to<\/li>\n\n\n\n
      • -gt<\/strong> \u2192 Greater than<\/li>\n\n\n\n
      • -lt <\/strong>\u2192 Less than<\/li>\n\n\n\n
      • -ge<\/strong> \u2192 Greater than or equal to<\/li>\n\n\n\n
      • -le<\/strong> \u2192\u00a0 Less than or equal to<\/li>\n<\/ul>\n\n\n\n

        File Test Operators<\/strong><\/h4>\n\n\n\n
          \n
        • -e FILE<\/strong> \u2192 Returns true<\/strong> if the file exists<\/strong><\/li>\n\n\n\n
        • -f FILE <\/strong>\u2192 Returns true<\/strong> if the file exists<\/strong> and is a regular file<\/strong><\/li>\n\n\n\n
        • -d FILE<\/strong> \u2192 Returns true<\/strong> if the file exists<\/strong> and is a directory<\/strong><\/li>\n\n\n\n
        • -r FILE<\/strong> \u2192 Returns true<\/strong> if the file is readable<\/strong><\/li>\n\n\n\n
        • -w FILE <\/strong>\u2192 Returns true<\/strong> if the file is writable<\/strong><\/li>\n\n\n\n
        • -x FILE <\/strong>\u2192 Returns true<\/strong> if the file is executable<\/strong><\/li>\n\n\n\n
        • -h FILE<\/strong> \u2192 Returns true<\/strong> if the file is a symbolic link<\/strong>
          <\/li>\n<\/ul>\n\n\n\n

          Integer Comparison Operators<\/strong><\/h4>\n\n\n\n
            \n
          • INTEGER1 -eq INTEGER2<\/strong>\u2192 Returns true if INTEGER<\/strong>1 is equal to INTEGER2<\/strong><\/li>\n\n\n\n
          • INTEGER1 -gt INTEGER2<\/strong>\u2192 Returns true if INTEGER1<\/strong> is greater than INTEGER2<\/strong><\/li>\n\n\n\n
          • INTEGER1 -lt INTEGER2<\/strong>\u2192 Returns true if INTEGER1 <\/strong>is less than INTEGER2<\/strong><\/li>\n\n\n\n
          • INTEGER1 -ge INTEGER2<\/strong>\u2192 Returns true if INTEGER1<\/strong> is greater than or equal to INTEGER2<\/strong><\/li>\n\n\n\n
          • INTEGER1 -le INTEGER2<\/strong>\u2192 Returns true if INTEGER<\/strong>1 is less than or equal to INTEGER2<\/strong><\/li>\n<\/ul>\n\n\n\n

            Important: <\/strong>Always quote strings in comparisons to prevent errors from word splitting or globbing.<\/p>\n\n\n\n

            Conclusion<\/strong><\/h4>\n\n\n\n

            The if statement<\/strong> in Bash is a powerful way to add logic to your shell scripts. The if<\/strong>, <\/strong>if…else<\/strong>, and <\/strong>if…elif…else<\/strong> statements in Bash allow you to control the flow of your script by evaluating specific conditions.<\/p>\n\n\n\n

            When a condition evaluates to false<\/strong>, the commands in the optional else<\/strong> clause will execute instead. This makes your scripts more powerful, dynamic, and adaptable to real-world tasks.<\/p>\n\n\n\n

            By mastering these conditionals, you can create smarter, more efficient Bash scripts that respond dynamically to user input and system states.<\/p>\n\n\n\n

            <\/p>\n","protected":false},"excerpt":{"rendered":"

            Conditional statements are a core concept in any programming language, and Bash is no exception. In shell scripting, decision-making lets you control the flow of execution based on whether a condition is true or false. Bash provides several options for this: if, if\u2026else, if\u2026elif\u2026else, and nested if statements. In this guide, we\u2019ll walk through the […]<\/p>\n","protected":false},"author":15,"featured_media":2391,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[222],"tags":[394],"class_list":["post-2390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-linux-tutorials-guides","tag-linux"],"blocksy_meta":[],"yoast_head":"\nBash If Else Statement Explained with Examples<\/title>\n<meta name=\"description\" content=\"Learn how to use the Bash if-else statement to make decisions in shell scripts using if, elif, and nested conditionals in Bash.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ucartz.com\/blog\/understanding-bash-ifelse-statements\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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