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Full Discussion: File handling in bash shell scripting
Top Forums UNIX for Dummies Questions & Answers File handling in bash shell scripting Post 302495221 by reeta_shri on Wednesday 9th of February 2011 04:53:40 PM
Old 02-09-2011
File handling in bash shell scripting
i am new to shell scripting and stuck at one place in my program.

i am reading data from one structured file and extracting some data from particular lines and then writing into the output file. In that reading input file line by line from while loop.

Code:
while read line 
 do
   rectype=line | cut c-1-2
   case rectype in
         10)
             header
          ;;
         20)
             continue
         ;;
         30)
           X=line | cut c-1-6
            data1 X

         ;;
         31)
            data2
          ;;
         32)
            data3
          ;;
         88)
            continue
         ;;
         89)
            trailer
         ;;
         *)
            echo "error in the file"
            exit 1 #exit script with error
         ;;
      esac
 done < input.txt

inside case i am calling different functions and writing into the output file, while i am extracting values with the help of cut it will go to the next line and loop continue there until end of file but i want to extract text at particular line and again go to the next line loop and then check the case.
thanks in advance.
Last edited by radoulov; 02-09-2011 at 06:14 PM.. Reason: Code tags, please!
 

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LEARN ABOUT BSD

break

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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