'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that allows your scripts to make decisions based on various scen...
How to use an If Statement with Then, Else, Else If (elif) clauses? Using a Bash If Statement with Conditional Expressions Using a Bash If Statement with multiple conditions Using Nested If Statements Common Pitfalls and Errors Incorrect usage of the single bracket command [ How to solve the...
You can combine multiple conditions using logical operators like && (AND) and || (OR). Here’s an example: !/bin/bash age=25 grade="A" if [ $age -gt 18 ] && [ "$grade" == "A" ] then echo "Congratulations! You are eligible for a scholarship." else echo "Sorry, you are no...
Conditions if elseConditions always start with the keyword if and end with fi:echo "Enter your age:" read AGE if (($AGE >= 18)) then echo "Access allowed" else echo "Access denied" fi$ bash script.sh Enter your age: 19 Access allowed $ bash script.sh Enter your age: 16 Access ...
" else echo "Apples are delicious!" fiUsing a case statementIf you are confronted with a couple of different possible actions to take, then using a case statement may be more useful than nested if statements. For more complex conditions use case like below:...
case "$var" in *sub_string*) # Do stuff ;; *sub_string2*) # Do more stuff ;; *) # Else ;; esac 检查字符串是否以子字符串开头if [[ $var == sub_string* ]]; then printf '%s\n' "var starts with sub_string." fi # 反转(变量不是以子串开头). if [[ $var != sub_string...
Here, we list some basic bash syntax with a brief explanation. It is a good starting point if you are a beginner.
A double-quoted string preceded by a dollar sign (‘$’) will cause the string to be translated according to the current locale. If the current locale isCorPOSIX, the dollar sign is ignored. If the string is translated and replaced, the replacement is double-quoted. ...
Regular expressions are shortened as ‘regexp' or ‘regex'. They are strings of characters that define a search pattern. It can be used as a search or search & replace operation. Loops and Conditions A loop is a statement in a bash programming language that allows code to be repeatedly ex...
If, however, we had used the * wildcard, then ${filename%ce*} would produce alice because it matches the shortest occurrence of ce followed by anything else. ${filename%%ce*} would return ali because it matches the longest occurrence of ce followed by anything else; in this case the ...