23
nov
Using conditional expressions to improve your shell scripts
You can use these very simple shell script conditional expressions to improve your home-made scripts, making them more efficient and easy to mantain.
To check if a file exists and it’s executable, use:
#!/bin/bash FILE=/usr/bin/passwd if [ -x $FILE ]; then echo "File $FILE exists and it is executable" else echo "File $FILE does not exists or it isnt executable" fi
There are several other options. Here’s the full available conditional expressions:
-e: Returns true value if file exists
-f: Return true value if file exists and regular file
-r: Return true value if file exists and is readable
-w: Return true value if file exists and is writable
-x: Return true value if file exists and is executable
-d: Return true value if exists and is a directory
Have fun improving your scripts !
23
set
Teste: Mod Syntax Highlighting
Encontrei este mod e passarei a usá-lo de agora em diante.
Quem quiser ter um igual é só instalar este mod aqui.
1 2 3 4 5 | public class Hello { public static void main(String[] args) { System.out.println("Olá mundo!"); } } |
1 2 3 4 | #!/bin/bash FILE=/etc/file echo $FILE echo "string" |
<?php function foo() { echo "Olá mundo!\\n"; } ?> |
begin function teste showmessage('Testandoo'); end; |
