Shell Scripts (BASH Scripts) can access command line parameters using the the variables $1, $2, $2 and so forth, up to $9. In fact, more parameters can be accessed by using curly brackets, like ${10}, ${187} and so forth. Here’s an example: #!/bin/bash if [[ $1 == “x” ]]; then echo “Statement is true” else … Read more
Sometimes it’s useful to print the current time and date in a BASH script. We can make use of the date command for that. By default, and if called without any parameters, it’ll print something like this: echo $(date) Tue 29 Nov 2016 23:08:10 EST We can shorten this to just the date by using … Read more
BASH can deal with simple functions, and they are defined like this: # this defines the function function testing { echo “Hi there!” } # this calls our function testing As far as I know, BASH functions cannot take or return parameters.
Here’s how to use simple variables in BASH shell scripts. It appears there are no data types, and everything’s a string (correct me if I’m wrong). We can define a variable by first setting it to a value, then later refer to that value with a dollar sign in front of the variable name. Here’s … Read more
It’s easy to establish an FTP connection using the ftp command from the Linux Command Line. Sadly this command does not accept login credentials as parameters – which means that if we use it in a script, our script will pause and wait for us to type those credentials in manually. Not really suitable for … Read more
Crash Course in BASH Script Programming (a classic):
