How to use if statement in bash script?
You can also use an if statement within another if statement. For example, take a look at the following weather.sh bash script: #!/bin/bash TEMP=$1 if [ $TEMP -gt 5 ]; then if [ $TEMP -lt 15 ]; then echo “The weather is cold.”. elif [ $TEMP -lt 25 ]; then echo “The weather is nice.”.
How to use nested IF statements in Bash?
Using nested if statements in bash You can also use an if statement within another if statement. For example, take a look at the following weather.sh bash script: #!/bin/bash TEMP=$1 if [ $TEMP -gt 5 ]; then if [ $TEMP -lt 15 ]; then echo “The weather is cold.”
How to check if a variable is empty in Bash?
A more stable way to check for an empty variable would be to use parameter expansion: MYVAR=${MYVAR:-“Bad Value”}. This method works for the traditional bourne shell, as well as ksh, and bash.
How to use a case statement in Bash?
Using Case statement in bash. You can also use case statements in bash to replace multiple if statements as they are sometimes confusing and hard to read. The general syntax of a case construct is as follows: case “variable” in “pattern1” ) Command … ;; “pattern2” ) Command … ;; “pattern2” ) Command … ;; esac.
What is the if or else keyword in Bash?
The if statement starts with the if keyword followed by the conditional expression and the then keyword. The statement ends with the fi keyword. If the TEST-COMMAND evaluates to True, the STATEMENTS gets executed. If TEST-COMMAND returns False, nothing happens, the STATEMENTS gets ignored.
When to use the conditional ” or ” in Bash?
In a bash script, using the conditional “or” in an “if” statement. This question is a sequel of sorts to my earlier question. The users on this site kindly helped me determine how to write a bash for loop that iterates over string values. For example, suppose that a loop control variable fname iterates over the strings “a.txt” “b.txt” “c.txt”.