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Full Discussion: Shell Script Comment code blocks in a bash source file
Top Forums Shell Programming and Scripting Shell Script Comment code blocks in a bash source file Post 302986916 by HiFuture0801 on Thursday 1st of December 2016 02:32:52 PM
Old 12-01-2016
Bug Shell Script Comment code blocks in a bash source file
Just began to learn on Shell Script. I got an exercise from my friend. I know how to make this happen in C, but I'm not familiar with Shell Script. Hope I can get some help from all of you.
I want to write a bash script to comment code blocks in a bash source file. What I mean comment is '#', I know that there is a build in command : would help. But I still have no idea how should I start this.
Should I read the source file first, Then output it as another file?

Here is an example:

Original Source File:
Code:
Final=$(date -d "2016-12-15 14:00" "+%j")
while true ; do
  Today=$(date "+%j")
  Days=$((Final - Today))
  if (( Days >= 14 )) ; then
    echo party
  elif (( Days >= 2 )) ; then
    echo study
  elif (( Days == 1 )) ; then
    for Count in 1 2 3   # loop 2
      do
      echo panic
    done   # loop 2
  else
    break
  fi
  sleep 8h
done

After Script:
Code:
Final=$(date -d "2016-12-15 14:00" "+%j")
while true ; do   # loop 1
  Today=$(date "+%j")
  Days=$((Final - Today))
  if (( Days >= 14 )) ; then   # selection 1
    echo party
  elif (( Days >= 2 )) ; then
    echo study
  elif (( Days == 1 )) ; then
    for Count in 1 2 3   # loop 2
      do
      echo panic
    done   # loop 2
  else
    break
  fi   # selection 1
  sleep 8h
done   # loop 1

Here is some other requirement:
Read from standard input, write to standard output.
At the end of any line containing while until for add the comment: # loop n
At the end of any line containing done add the comment: # loop n
At the end of any line containing if case add the comment: # selection n
At the end of any line containing fi esac add the comment: # selection n
Last edited by HiFuture0801; 12-01-2016 at 03:49 PM.. Reason: Provide Example
 

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LEARN ABOUT SUNOS

continue

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until	loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
	   able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
	   tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10							    17 Jul 2002 							  break(1)
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