Loops in shell scripts
|
With loops, you can execute part of a shell script over and over until an ending condition terminates it. You can use loops in menu controls and data processing. Without loops, you would need to start the scripts every time you wanted to process a piece of data.
Building Loops
A loop begins with for , while , or until (the loop header). After that follows a do statement that ends with done . Between do and done are the statements to execute (the loop body):
for / while / until [LOOP HEADER] do [commands] [LOOP BODY] done
[...]
Buy this article as PDF
Pages: 5
(incl. VAT)
Buy Ubuntu User
US / Canada
UK / Australia
Related content
-
Controlling shell processes using signals
Instead of just killing processes, professionals cleverly catch their communication and steer the computer's tasks in the right direction using signals.
-
Create menus and dialogs for shell scripts
From simple queries to complex menus: Using dialog, you can create a graphical interface for shell scripts with only a few extra lines of code.
-
Writing clearer Bash scripts
Does the ingenious script your wrote last month look like confusing spaghetti code today? We show some proven style guidelines that can provide order and readability.
-
Calculate from the command line with Spigot
The Spigot calculator distinguishes itself with its high accuracy and precise results from the shell.
-
Compiling Bash Scripts with SHC
The Shell Script Compiler converts scripts into binaries, which protects against accidental changes but also carries some pitfalls.