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Full Discussion: Looping structure to make up for lack of bash GOTO
Top Forums Shell Programming and Scripting Looping structure to make up for lack of bash GOTO Post 302904277 by rbatte1 on Tuesday 3rd of June 2014 08:29:19 AM
Old 06-03-2014
Not having a GOTO is actually very good for structured programming. Think of the process you are trying to achieve and then split every action into simpler steps, then repeat until you can go no smaller.

Each final action should be either in a sequence, a condition or a loop. Using GOTO allows you to write spaghetti that is difficult to follow when you need to trace an error. It's lazy really.

If you write functions for the section of code you may or may not need, then a simple loop at the end actually makes it easier.
Code:
#!/bin/bash
function1()
{
 echo this is function 1
}
function2()
{
 echo this is function 2
}
function3()
{
 echo this is function 3
}

f=1
while [ $f -le 3 ]
do
   function$f
   ((f=$f+1))
done

or
Code:
:
:
while true
do
   function$f
done

with which you need to call exit from one of the functions.

The shells sh, ksh, bash etc. are not limited. They work as designed and deny the lazy use of GOTO which can cause more problems than the minor inconvenience it leaves.
 

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LEARN ABOUT LINUX

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
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