If statement and else statement could be nested in bash. The keyword “fi” indicates the end of the inner if statement and all if statement should end with the keyword “fi”. The “if then elif then else fi” example mentioned in above can be converted to the nested if as shown belo...
Use the Linux Bash if statement to build conditional expressions with anifthenfistructure. Addelifkeywords for additional conditional expressions, or theelsekeyword to define a catch-all section of code that's executed if no previous conditional clause was executed. All non-trivial Bash scripts need...
Now lets show specific examples of the basic variations of theIFELIFandELSEconditions in working examples below. Example 1: If statement in bash on string equality #!/bin/bash read-p"Enter a match word: "USER_INPUT if[[$USER_INPUT=="hello"]];then ...
Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
Example 1: Checking the “If -Z” Statement Using “[]” Create a Bash file with the following script where the use of the “if –z” statement with the “[]” is shown. Two inputs are taken from the user. If any of the input values is empty, an error message is printed. Other...
Examples: [ n1 -eq n2 ] (true if n1 same as n2, else false) [ n1 -ge n2 ] (true if n1greater then or equal to n2, else false) [ n1 -le n2 ] (true if n1 less then or equal to n2, else false) [ n1 -ne n2 ] (true if n1 is not same as n2, else false) ...
The if statement allows you to specify courses of action to be taken in a shell script, depending on the success or failure of some command. It is a conditional statement that allows a test before performing another statement. The syntax for the simplest
Now that you are aware of the various comparison expressions let's see them in action in various examples. Use if statement in bash Let's create a script that tells you if a given number is even or not. Here's my script namedeven.sh: ...
if [[ $string2 = *"Bash"* ]] then printf "Contains word 'Bash'. \n" else printf "Does not contain the word. \n" fi 如何把for语句放在一行里执行? #!/bin/bash # For statement in multiple lines for((i=1;i<10;i+=2))
if["$1"=""];then If the first argument is empty, print an error and exit your script: echo"Please provide a new directory name as the first argument" exit The slightly strange "fi" keyword ("if" reversed) signals the end of an if statement in Bash: ...